Dodge RAM 2000 3500 Truck 5.9L Workshop Manual

dodge :: Dodge Truck RAM 3500 Truck 2WD V8-

5.9L VIN 5 HDC (2000)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Antitheft Relay > Component Information > Locations

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> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Antitheft Relay > Component Information > Locations > Page 7

Antitheft Relay: Diagrams

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Antitheft Relay > Component Information > Locations > Page 8

RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

Power Distribution Center

Security Relay

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Antitheft Relay > Component Information > Locations > Page 9

RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

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> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Service Precautions

Seat Heater Control Module: Service Precautions

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERINGWHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATETHE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TODISCHARGE BEFORE PER- FORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENTAND POSSIBLE PERSONAL INJURY.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Service Precautions > Page 14

Seat Heater Control Module: Description and Operation

Heated Seat Module

HEATED SEAT MODULE

The heated seat module is also known as the Seat Heat Interface Module or SHIM. The heated seat module is located under the front seat centercushion, where it is secured to a mounting bracket that also serves as the support for the slide-out rear seat cup holder unit. Two of the threemounting tabs that are molded into the plastic housing of the heated seat module are inserted through two holes in the mounting bracket and thensecured by two push on retainers. The heated seat module has a single connector receptacle that allows the module to be connected to all of therequired inputs and outputs through the seat wire harness.

The heated seat module is an electronic microprocessor controlled device designed and programmed to use inputs from the heated seat relay, thetwo heated seat switches and the two heated seat sensors to operate and control the heated seat elements in both front seats and the two heated seatindicator lamp Light-Emitting Diodes (LEDs) in each heated seat switch. The heated seat module is also programmed to perform self-diagnosis ofcertain heated seat system functions and provide feedback of that diagnosis through the heated seat switch indicator lamps.
The heated seat module cannot be repaired. If the heated seat module is damaged or faulty, the entire module must be replaced.

The heated seat module operates on fused battery current received from the heated seat relay. The module is grounded at all times through aground screw located below the left rear speaker in the cab of the vehicle. Inputs to the module include a resistor multiplexed heated seat switchrequest circuit for each of the two heated seat switches and the heated seat sensor inputs from the seat cushions of each front seat. In response tothose inputs the heated seat module controls battery current feeds to the heated seat elements and sensors, and controls the ground for the heatedseat switch indicator lamps.

When a heated seat switch (Driver or Passenger) request signal is received by the heated seat module, the module energizes the proper indicatorlamp (Low or High) in the switch by grounding the indicator lamp circuit to indicate that the heated seat system is operating. At the same time, theheated seat module energizes the selected heated seat sensor circuit and the sensor provides the module with an input indicating the surfacetemperature of the selected seat cushion.

36 C (96.8 F) 42 C (107.6 F)

The Low heat set point is about , and the High heat set point is about . If the seat cushion surface temperatureinput is below the temperature set point for the selected temperature setting, the heated seat module energizes an N-channel Field Effect Transistor(N-FET) within the module which energizes the heated seat elements in the selected seat cushion and back. When the sensor input to the moduleindicates the correct temperature set point has been achieved, the module de-energizes the N-FET which de-energizes the heated seat elements.The heated seat module will continue to cycle the N-FET as needed to maintain the selected temperature set point.
If the heated seat module detects a heated seat sensor value input that is out of range or a shorted or open heated seat element circuit, it will notifythe vehicle operator or the repair technician of this condition by flashing the High and/or Low indicator lamps in the affected heated seat switch.Refer to Heated Seat System and Heated Seat Module diagnosis and testing procedures.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Service Precautions > Page 15

Seat Heater Control Module: Testing and Inspection

The heated seat module is also known as the Seat Heat Interface Module or SHIM.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERINGWHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATETHE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TODISCHARGE BEFORE PER- FORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENTAND POSSIBLE PERSONAL INJURY.

1. If a heated seat fails to heat and one or both of the indicator lamps on a heated seat switch flash, refer to Heated Seat System diagnosis and testing

procedures. If a heated seat heats but one or both indicator lamps on the heated seat switch fail to operate, test the heated seat switch. Refer toHeated Seat Switch diagnosis and testing procedures. If the heated seat switch checks OK, go to Step 4. If both seats (driver and passenger) fail toheat and the indicator lamps on the heated seat switches for both seats fail to operate, test the heated seat relay. Refer to Heated Seat Relaydiagnosis and testing procedures. If the heated seat relay checks OK, go to Step 2. If only one seat (driver or passenger) fails to heat and theindicator lamps on the heated seat switch for that seat fail to operate, test that heated seat switch. Refer to Heated Seat Switch diagnosis and testingprocedures. If the heated seat switch checks OK, go to Step 3. If a heated seat switch indicator lamp remains illuminated after the heated seat hasbeen turned Off, go to Step 5

2. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector for the heated seat module from the heated seat module
connector receptacle. Check for continuity between the ground circuit cavity of the wire harness connector for the heated seat module and a goodground. If OK, go to Step 3. If not OK, repair the open ground circuit to ground as required.

3. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector for the heated seat module from the heated seat module

connector receptacle. Remove the heated seat switches from the instrument panel. Disconnect the instrument panel wire harness connector(s) fromthe connector receptacle(s) of the inoperative heated seat switch(es). Check for continuity between the inoperative driver and/or passenger heatedseat switch circuit cavities of the heated seat switch wire harness connector(s) and the heated seat module wire harness connector. There should becontinuity. If OK, replace the faulty heated seat module. If not OK, repair the open driver and/or passenger heated seat switch circuit as required.

4. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector for the heated seat module from the heated seat module

connector receptacle. Remove the heated seat switches from the instrument panel. Disconnect the instrument panel wire harness connector(s) fromthe connector receptacle(s) of the heated seat switch(es) with the inoperative indicator lamp(s). Check for continuity between the inoperative leftand/or right seat high and/or low heat LED driver circuit cavities of the heated seat switch wire harness connector(s) and the heated seat modulewire harness connector. There should be continuity. If OK, replace the faulty heated seat module. If not OK, repair the open left or right seat highor low heat LED driver circuit as required.

5. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector for the heated seat module from the heated seat module

connector receptacle. Remove the heated seat switches from the instrument panel. Disconnect the instrument panel wire harness connector(s) fromthe connector receptacle(s) of the heated seat switch(es) with the inaccurate indicator lamp(s). Check for continuity between the inoperative leftand/or right seat high and/or low heat LED driver circuit cavity of the heated seat switch wire harness connector(s) and a good ground. Thereshould be no continuity. If OK, replace the faulty heated seat module. If not OK, repair the shorted left or right seat high or low heat LED drivercircuit as required.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Service Precautions > Page 16

Seat Heater Control Module: Service and Repair
REMOVAL

1. Disconnect and isolate the battery negative cable.2. Remove the front seat center cushion and back from the driver side and passenger side seat adjuster brackets. Refer to front seat center cushion
and back removal procedures.

Heated Seat Module Remove/Install

3. Disconnect the seat wire harness connector from the connector receptacle on the back of the heated seat module.4. Remove the two push-on retainers that secure the mounting tabs of the heated seat module to the top of the mounting bracket.5. Remove the heated seat module from the bottom of the mounting bracket.

INSTALLATION

1. Position the heated seat module mounting tabs through both holes from the bottom of the mounting bracket.2. Install the two push-on retainers onto the heated seat module mounting tabs to secure the module to the top of the mounting bracket.3. Reconnect the seat wire harness connector to the connector receptacle on the back of the heated seat module.4. Install the front seat center cushion and back onto the driver side and passenger side seat adjuster brackets. Refer to Center Seat/Console for seat
center cushion and back installation procedures.

5. Reconnect the battery negative cable.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations

Seat Heater Relay: Locations

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 20

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> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 21

Seat Heater Relay: Diagrams

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RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

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> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 23

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> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 24

Seat Heater Relay: Service Precautions

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERINGWHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATETHE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TODISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENTAND POSSIBLE PERSONAL INJURY.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 25

Seat Heater Relay: Description and Operation

Heated Seat Relay

HEATED SEAT RELAY

The heated seat relay is an electromechanical device that switches battery current to the heated seat module when the relay control coil isenergized. The heated seat relay is located in the Junction Block (JB), on the left end of the instrument panel in the passenger compartment. Theheated seat relay is a International Standards Organization (ISO) micro-relay. Relays conforming to the ISO specifications have common physicaldimensions, current capacities, terminal patterns, and terminal functions, The ISO micro-relay terminal functions are the same as a conventionalISO relay. However, the ISO micro- relay terminal pattern (or footprint) is different, the current capacity is lower, and the physical dimensions aresmaller than those of the conventional ISO relay.
The heated seat relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.

The ISO relay consists of an electromagnetic coil, a resistor or diode, and three (two fixed and one movable) electrical contacts. The movable(common feed) relay contact is held against one of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil isenergized, it draws the movable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed contact.When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed position. The resistor or diode isconnected in parallel with the electromagnetic coil in the relay, and helps to dissipate voltage spikes that are produced when the coil isde-energized.

The heated seat relay is controlled by the premium version of the Central Timer Module (CTM), which controls the ground feed to the coil groundterminal of the relay to energize and de-energize the electromagnetic coil of the relay. The CTM monitors engine operation through messages itreceives from the Powertrain Control Module (PCM) over the Chrysler Collision Detection (CCD) data bus network. The CTM is programmed toenergize the relay only when the engine is running, and to de-energize the relay when the engine is not running. Refer to Central Timer Module forthe location of more information on the premium CTM.

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 26

Seat Heater Relay: Testing and Inspection

Heated Seat Relay

The heated seat relay is located in the Junction Block (JB) on the left end of the instrument panel in the passenger compartment of the vehicle.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERINGWHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATETHE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TODISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENTAND POSSIBLE PERSONAL INJURY.
RELAY TEST

1. Remove the heated seat relay from the JB. Refer to Heated Seat Relay removal procedures.2. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 3. If not OK, replace the faulty relay.

75 +/- 5 ohms

3. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 4. If not OK, replace the faulty relay.4. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, perform the Relay Circuit Test that follows. If not OK, replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to battery voltage and should be hot at all times. If OK, go to Step 2. If not OK, repair
the open circuit to the fused B(+) fuse in the Power Distribution Center (PDC) as required.

2. The relay normally closed terminal (87A) is connected to terminal 30 in the de-energized position, but is not used for this application. Go to Step

3.

3. The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery

voltage to the heated seat module. There should be continuity between the cavity for relay terminal 87 and the B(+) to heated seat module circuitcavity of the heated seat module wire harness connector at all times. If OK, go to Step 4. If not OK, repair the open B(+) to heated seat modulecircuit to the heated seat module as required.

4. The coil battery terminal (86) is connected to the electromagnet in the relay. It is connected to battery voltage and should be hot at all times. Check
for battery voltage at the cavity for relay terminal 86. If OK, go to Step 5. If not OK, repair the open circuit to the fused B(+) fuse in the PDC asrequired.

5. The coil ground terminal (85) is connected to the electromagnet in the relay. It is grounded by the premium version of the Central Timer Module

(CTM) in response to an engine speed message received over the Chrysler Collision Detection (CCD) data bus from the Powertrain ControlModule (PCM) when the engine is running. Check for continuity between the cavity for relay terminal 85 and the heated seat relay control circuitcavity of the CTM wire harness connector. There should be continuity at all times. If OK, use a DRB III scan tool and the proper diagnosticprocedures to test the operation of the CTM and CCD data bus. If not OK, repair the open heated seat relay control circuit as required.

For addtional testing please refer to Powertrain Management/Computers and Controls/Body Control Module/Testing and Inspection/ See: Relays andModules - Powertrain Management/Relays and Modules - Computers and Control Systems/Central Timer Module/Testing and Inspection

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 27

Seat Heater Relay: Service and Repair

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERINGWHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATETHE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TODISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENTAND POSSIBLE PERSONAL INJURY.
REMOVAL

1. Disconnect and isolate the battery negative cable.2. Remove the fuse access panel by inserting a finger in the finger recess molded into the panel and then pulling the panel sharply away from the left
outboard end of the instrument panel.

Heated Seat Relay

3. The heated seat relay is located on the forward side of the Junction Block (JB), just above the combination flasher.4. Grasp the heated seat relay firmly and pull it straight out from the JB,

INSTALLATION

1. Position the heated seat relay in the proper receptacle in the JB.2. Align the heated seat relay terminals with the terminal cavities in the JB receptacle.3. Push in firmly on the heated seat relay until the terminals are fully seated in the terminal cavities in the JB receptacle.4. Insert the tabs on the forward edge of the fuse access panel in the notches on the forward edge of the instrument panel fuse access panel opening.5. Press the rear edge of the fuse access panel in toward the instrument panel until the panel snaps back into place.6. Reconnect the battery negative cable.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications

Controller Antilock Brake: Specifications

RWAL Valve Mounting Bolt 180-240 in.lb

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Locations > EBC 325

Controller Antilock Brake (CAB) EBC 325

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Locations > EBC 325 > Page 34

Controller Antilock Brake (CAB) EBC 2

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Diagrams > Connector C1

Connector Pin Identification

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Diagrams > Connector C1 > Page 37

Connector Pin Identification

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Diagrams > Page 38

Controller Antilock Brake: Description and Operation

(CAB)

The controller-antilock brake module is used to monitor wheel speeds and modulates (control) hydraulic pressure in each brake channel. Themodulated hydraulic pressure is used to prevent wheel lock up during braking. The CAB also provides a vehicle speed signal (WSS) to the powertraincontrol module.

During a non-ABS stop, the system functions as a standard front/rear split configuration. The primary supplies brake fluid pressure to the front brakes,and the secondary supplies the rear brakes.

All 2500 and 3500 Series vehicles with EBC 325 do not use a conventional combination/proportioning valve. This system uses the existing ABSsolenoids to replace and perform the same functions that the combination and proportioning valves do. The CAB has a special software programcalled Electronic Brake Distribution (EBD), that monitors the wheel speeds and when certain criteria are met the software will enable the solenoids toperform the same brake fluid management control as the combination/proportioning valves.

During an ABS stop, the system still uses the front/rear hydraulic split; however, the brake system pressure is further split into three control channels.During ABS operation, the front wheels are controlled independently and are on two separate control channels. The rear wheels are controlledtogether through one control channel. By using separate control channels for the front wheel, more steering control is maintained during maximumbraking.

During an antilock stop, "wheel lock-up" does not necessarily mean that the wheel has locked, it means only that the wheel is turning slower than thevehicle speed. This is called "wheel slip" and is indicated as a percentage. 0% slip means that the wheel is rolling free and 100% slip means that thewheel is locked. The antilock system maintains an average of approximately 20% wheel slip.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Service and Repair > Four Wheel Antilock System

Controller Antilock Brake: Service and RepairFour Wheel Antilock System

NOTE:

If the CAB needs to be replaced, the rear axle type and tire revolutions per mile must be programmed into the new CAB. For axle type referto Transmission and Drivetrain, Differential. For tire revolutions per mile refer to Steering and Suspension, Tires, Wheels and Alignment. To programthe CAB refer to Testing and Inspection, Procedures.

REMOVAL

1. Disconnect battery negative cable.

2. Push the harness connector locks to release the locks, then remove the connectors from the CAB.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information >

Service and Repair > Four Wheel Antilock System > Page 41

RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

3. Disconnect the pump motor connector.

4. Remove screws attaching CAB to the HCU.5. Remove the CAB.

INSTALLATION

1. Place the CAB onto the HCU.

Insure the CAB seal is in position before installation.NOTE:

4 - 4.7 Nm (36 - 42 inch lbs.)

2. Install the mounting screws and tighten to .3. Connect the pump motor harness.4. Connect the harnesses to the CAB and lock the connectors.5. Connect battery.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Service and Repair > Four Wheel Antilock System >

Page 42

Controller Antilock Brake: Service and RepairRear Wheel Antilock System

NOTE:

If the CAB needs to be replaced, the rear axle type and tire revolutions per mile must be programmed into the new CAB. For axle type refer toTransmission and Drivetrain, Differential. For tire revolutions per mile refer to Steering and Suspension, Tires, Wheels and Alignment. To program theCAB refer to Testing and Inspection, Procedures.

REMOVAL

1. Pull up on the CAB harness connector lock release and remove the connector from the controller.2. Remove the RWAL valve harness connector from the controller.

3. Remove the controller mounting screws and remove the controller from the mounting bracket.

INSTALLATION

2.5 - 3.5 Nm (22 - 31 inch lbs.)

1. Position the controller on the bracket and install the mounting screws. Tighten the screws to .2. Install the RWAL valve harness connector into the controller.3. Install the CAB harness connector into the controller and push down on the connector lock.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations

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> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 47

Blower Motor Relay: Diagrams

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 48

RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

Power Distribution Center

Blower Motor Relay

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 49

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> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 50

Blower Motor Relay: Description and Operation
BLOWER MOTOR RELAY

The blower motor relay is an International Standards Organization (ISO)-type relay. The relay is an electromechanical device that switches batterycurrent from a fuse in the Power Distribution Center (PDC) directly to the blower motor. The relay is energized when the relay coil is provided a voltagesignal by the ignition switch. This arrangement reduces the amount of battery current that must flow through the ignition switch.

The blower motor relay control circuit is protected by a fuse located in the junction block. When the relay is de-energized, the blower motor receives nobattery current. See Blower Motor Relay in the Diagnosis and Testing for more information.
The blower motor relay is located in the PDC in the engine compartment. Refer to the PDC label for blower motor relay identification and location.
The blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 51

Blower Motor Relay: Testing and Inspection

Blower Motor Relay

RELAY TEST

The blower motor relay is located in the Power Distribution Center (PDC). Remove the blower motor relay from the PDC as described in this toperform the following tests:1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,

go to Step 2. If not OK, replace the faulty relay.

75 5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, see Relay Circuit Test in the Diagnosis and Testing. If not OK,replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to fused battery feed directly from a fuse in the Power Distribution Center (PDC), and
should be hot at all times. Check for battery voltage at the PDC cavity for relay terminal 30. If OK, go to Step 2. If not OK, repair the open circuitto the PDC fuse as required.

2. The relay normally closed terminal cavity (87A) is not used for this application. Go to Step 3.3. The relay normally open terminal cavity (87) is connected to the blower motor. When the relay is energized, terminal 87 is connected to terminal

30 and provides full battery current to the blower motor feed circuit. There should be continuity between the PDC cavity for terminal 87 and the blower motor relay output circuit cavity of the blower motor wire harness connector at all times. If OK, go to Step 4. If not OK, repair the opencircuit to the blower motor as required.

4. The coil battery terminal cavity (86) is connected to the ignition switch. When the ignition switch is placed in the ON position, fused ignition

switch output is directed from a fuse in the junction block to the relay electromagnetic coil to energize the relay. There should be battery voltage atthe PDC cavity for relay terminal 86 with the ignition switch in the ON position. If OK, go to Step 5. If not OK, repair the open circuit to thejunction block fuse as required.

5. The coil ground terminal cavity (85) is connected to ground. This terminal supplies the ground for the relay electromagnetic coil. There should be

continuity between the PDC cavity for relay terminal 85 and a good ground at all times. If not OK, repair the open circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 52

Blower Motor Relay: Service and Repair
REMOVAL AND INSTALLATION

1. Disconnect and isolate the battery negative cable.

Power Distribution Center

2. Remove the cover from the Power Distribution Center (PDC).3. Refer to the label on the PDC for blower motor relay identification and location.4. Unplug the blower motor relay from the PDC.5. Install the blower motor relay by aligning the relay terminals with the cavities in the PDC and pushing the relay firmly into place.6. Install the PDC cover.7. Connect the battery negative cable.8. Test the relay operation.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations

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> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 56

Compressor Clutch Relay: Diagrams

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 57

RAM 3500 Truck 2WD V8-5.9L VIN 5 HDC (2000)

Power Distribution Center

A/C Compressor Clutch Relay

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 58

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> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 59

Compressor Clutch Relay: Description and Operation
COMPRESSOR CLUTCH RELAY

The compressor clutch relay is a International Standards Organization (ISO) micro-relay. The terminal designations and functions are the same as aconventional ISO relay. However, the micro-relay terminal orientation (footprint) is different, the current capacity is lower, and the relay casedimensions are smaller than those of the conventional ISO relay.

The compressor clutch relay is a electromechanical device that switches battery current to the compressor clutch coil when the Powertrain ControlModule (PCM) grounds the coil side of the relay The PCM responds to inputs from the heater-A/C mode control switch, the low pressure cycling clutchswitch, and the high pressure cut-off switch. See Compressor Clutch Relay in the Diagnosis and Testing for more information.

The compressor clutch relay is located in the Power Distribution Center (PDC) in the engine compartment. Refer to the PDC label for relay identificationand location.
The compressor clutch relay cannot be repaired and, if faulty or damaged, it must be replaced.

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Compressor Clutch Relay: Testing and Inspection

Compressor Clutch Relay

RELAY TEST

The compressor clutch relay is located in the Power Distribution Center (PDC). Refer to the PDC label for relay identification and location. Removethe relay from the PDC to perform the following tests:1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,

go to Step 2. If not OK, replace the faulty relay.

75 5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, see Relay Circuit Test in the Diagnosis and Testing. If not OK, replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to fused battery feed. There should be battery voltage at the cavity for relay terminal 30
at all times. If OK, go to Step 2. If not OK, repair the open circuit to the fuse in the PDC as required.

2. The relay normally closed terminal (87A) is not used in this application. Go to Step 3.3. The relay normally open terminal cavity (87) is connected to the compressor clutch coil. There should be continuity between this cavity and the
A/C compressor clutch relay output circuit cavity of the compressor clutch coil wire harness connector. If OK, go to Step 4. If not OK, repair theopen circuit as required.

4. The relay coil battery terminal (86) is connected to the fused ignition switch output (run/start) circuit. There should be battery voltage at the cavity
for relay terminal 86 with the ignition switch in the ON position. If OK, go to Step 5. If not OK, repair the open circuit to the fuse in the junctionblock as required.

5. The coil ground terminal cavity (85) is switched to ground through the Powertrain Control Module (PCM). There should be continuity between
this cavity and the A/C compressor clutch relay control circuit cavity of the PCM wire harness connector C (gray) at all times. If not OK, repair theopen circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 61

Compressor Clutch Relay: Service and Repair
REMOVAL AND INSTALLATION

1. Disconnect and isolate the battery negative cable.

Power Distribution Center

2. Remove the cover from the Power Distribution Center (PDC).3. Refer to the label on the PDC for compressor clutch relay identification and location.4. Unplug the compressor clutch relay from the PDC.5. Install the compressor clutch relay by aligning the relay terminals with the cavities in the PDC and pushing the relay firmly into place.6. Install the PDC cover.7. Connect the battery negative cable.8. Test the relay operation.

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> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Locations

Audible Warning Device Control Module: Locations

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Audible Warning Device Control Module: Diagram Information and Instructions

How to Find System & Component Diagrams

Group Index Complete Body and Chassis Diagrams

When trying to find the diagram for a specific component or system, use the information under .See: Diagrams/Electrical Diagrams

Complete Body and Chassis Diagrams

GroupIndex

Whenever a reference exists to another sheet or figure, find the corresponding diagram in , using the . The reference number for the subsequent diagram will match a listed group shown.See: Diagrams/Electrical Diagrams

How to Use Wiring Diagrams

DaimlerChrysler Corporation wiring diagrams are designed to provide information regarding the vehicles wiring content. In order to effectively use thewiring diagrams to diagnose and repair DaimlerChrysler Corporation vehicles, it is important to understand all of their features and characteristics.

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General Information (Part 1 of 2)

Diagrams are arranged such that the power (B+) side of the circuit is placed near the top of the page, and the ground (B-) side of the circuit is placednear the bottom of the page (Fig. 1).

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General Information (Part 2 of 2)

All switches, components, and modules are shown in the at rest position with the doors closed and the key removed from the ignition (Fig. 2).

Components are shown two ways. A solid line around a component indicates that the component is complete. A dashed line around the componentindicates that the component is being shown is not complete. Incomplete components have a reference number to indicate the page where the componentis shown complete.

It is important to realize that no attempt is made on the diagrams to represent components and wiring as they appear on the vehicle. For example, a shortpiece of wire is treated the same as a long one. In addition, switches and other components are shown as simply as possible, with regard to function only.

Circuit Functions

Circuit Identification Code Chart

All circuits in the diagrams use an alpha/numeric code to identify the wire and its function. To identify which circuit code applies to a system, refer to theCircuit Identification Code Chart. This chart shows the main circuits only and does not show the secondary codes that may apply to some models.

Circuit Information

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Wire Code Identification

Wire Color Code Chart

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Each wire shown in the diagrams contains a code which identifies the main circuit, part of the main circuit, gauge of wire, and color.

Connector, Ground and Splice Information

CAUTION:

Not all connectors are serviced. Some connectors are serviced only with a harness. A typical example might be the Supplemental RestraintSystem connectors. Always check parts availability before attempting a repair.

IDENTIFICATION

Connectors, grounds, and splices are identified as follows:-

In-line connectors located in the engine compartment are series numbersC100

-

In-line connectors located in the Instrument Panel area are series numbers.C200

-

In-line connectors located in the body are series numbers.C300

-

Jumper harness connectors are series numbers.C400

-

Grounds and ground connectors are identified with a "" and follow the same series numbering as the in-line connectors.G

-

Splices are identified with an "" and follow the same series numbering as the in-line connectors.S

­Component connectors are identified by the component name instead of a number. Multiple connectors on a component use a C1, C2, etc.identifier.

Electrostatic Discharge (ESD) Sensitive Devices

Electrostatic Discharge Symbol

All ESD sensitive components are solid state and a symbol is used to indicate this. When handling any component with this symbol comply with thefollowing procedures to reduce the possibility of electrostatic charge build up on the body and inadvertent discharge into the component. If it is notknown whether the part is ESD sensitive, assume that it is.

1. Always touch a known good ground before handling the part. This should be repeated while handling the part and more frequently after sliding
across a seat, sitting down from a standing position, or walking a distance.

2. Avoid touching electrical terminals of the part, unless instructed to do so by a written procedure.3. When using a voltmeter, be sure to connect the ground lead first.4. Do not remove the part from its protective packing until it is time to install the part.5. Before removing the part from its package, ground the package to a known good ground on the vehicle.

Notes, Cautions and Warnings

Additional important information is presented in three ways: Notes, Cautions, and Warnings.

NOTES

are used to help describe how switches or components operate to complete a particular circuit. They are also used to indicate differentconditions that may appear on the vehicle. For example, an up-to and after condition.

are used to indicate information that could prevent making an error that may damage the vehicle.CAUTIONS

WARNINGS

provide information to prevent personal injury and vehicle damage. Below is a list of general warnings that should be followed any time avehicle is being serviced.

WARNING:

- ALWAYS WEAR SAFETY GLASSES FOR EYE PROTECTION.

- USE SAFETY STANDS ANYTIME A PROCEDURE REQUIRES BEING UNDER A VEHICLE.

­BE SURE THAT THE IGNITION SWITCH ALWAYS IS IN THE OFF POSITION, UNLESS THE PROCEDURE REQUIRES IT TOBE ON.

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­SET THE PARKING BRAKE WHEN WORKING ON ANY VEHICLE. AN AUTOMATIC TRANSMISSION SHOULD BE IN PARK.A MANUAL TRANSMISSION SHOULD BE IN NEUTRAL.

- OPERATE THE ENGINE ONLY IN A WELL-VENTILATED AREA.

- KEEP AWAY FROM MOVING PARTS WHEN THE ENGINE IS RUNNING, ESPECIALLY THE FAN AND BELTS.

­TO PREVENT SERIOUS BURNS, AVOID CONTACT WITH HOT PARTS SUCH AS THE RADIATOR, EXHAUST MANIFOLD(S),TAIL PIPE, CATALYTIC CONVERTER, AND MUFFLER.

­DO NOT ALLOW FLAME OR SPARKS NEAR THE BATTERY. GASES ARE ALWAYS PRESENT IN AND AROUND THEBATTERY.

- ALWAYS REMOVE RINGS, WATCHES, LOOSE HANGING JEWELRY, AND LOOSE CLOTHING.

Symbols

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Wiring Diagram Symbols

International symbols are used throughout the wiring diagrams. These symbols are consistent with those being used around the world (Fig. 3).

Take Outs

The abbreviation is used in the component location section to indicate a point in which the wiring harness branches out to a component.T/O

Terminology

This is a list of terms and definitions used in the wiring diagrams.

LHD ............................................................................................................................................................................................... Left Hand Drive VehiclesRHD ............................................................................................................................................................................................. Right Hand Drive VehiclesATX ................................................................................................................................................................. Automatic Transmissions-Front Wheel DriveMTX ..................................................................................................................................................................... Manual Transmissions-Front Wheel DriveAT ..................................................................................................................................................................... Automatic Transmissions-Rear Wheel DriveMT ........................................................................................................................................................................ Manual Transmissions-Rear Wheel DriveSOHC ..................................................................................................................................................................................... Single Over Head Cam EngineDOHC ................................................................................................................................................................................... Double Over Head Cam EngineBUX ............................................................................................................................................................................................................. Built-Up-ExportBuilt-Up-Export .................................................................................................................. Vehicles Built For Sale In Markets Other Than North America Except Built-Up-Export ........................................................................................................................................ Vehicles Built For Sale In North America

Section Identification and Information

Section Identification

The wiring diagrams are grouped into individual sections. If a component is most likely found in a particular group, it will be shown complete (all wires,connectors, and pins) within that group. For example, the Auto Shutdown Relay is most likely to be found in Group 30, so it is shown there complete. Itcan, however, be shown partially in another group if it contains some associated wiring.

Connector and Terminal Replacement
CONNECTOR AND TERMINAL REPLACEMENT

1. Disconnect battery.2. Disconnect the connector (that is to be repaired) from its mating half/component.3. Cut off the existing wire connector directly behind the insulator. Remove of tape from the harness.6 inches