Buick Century 1994 2.2L Workshop Manual

buick :: Buick Century L4-2.2L VIN 4 (1994)

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

Behind Center Of I/P

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

Behind RH Side Of I/P

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations

LH Side Of Luggage Compartment

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 12

Keyless Entry Module: Diagrams

Remote Keyless Entry (RKE) Module

Remote Keyless Entry (RKE) Module

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer Interest for Relay Module: > 09-06-03-004D

Relay Module: Customer InterestElectrical - MIL ON/DTC's Set By Various Control Modules
TECHNICAL

09-06-03-004DBulletin No.:

December 08, 2010Date:

Subject:

Intermittent No Crank/No Start, No Module Communication, MIL, Warning Lights, Vehicle Messages or DTCs Set by Various ControlModules - Diagnosing and Repairing Fretting Corrosion (Disconnect Affected Connector and Apply Dielectric Lubricant)

Models:

2011 and Prior GM Passenger Cars and Trucks

Attention:

This repair can be applied to ANY electrical connection including, but not limited to: lighting, body electrical, in-line connections, powertrain controlsensors, etc. DO NOT over apply lubricant to the point where it prevents the full engagement of sealed connectors. A light coating on the terminalsurfaces is sufficient to correct the condition.

Supercede:This bulletin is being revised to update the Attention statement and add the 2011 model year. Please discard Corporate Bulletin Number 09-06-03-004C(Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on any of the following conditions:

- An intermittent no crank/no start

- Intermittent malfunction indicator lamp (MIL) illumination

- Intermittent service lamp illumination

- Intermittent service message(s) being displayed

The technician may determine that he is unable to duplicate the intermittent condition.

Cause

- Vibration

- Thermal cycling

- Poor connection/terminal retention

- Micro motion

- A connector, component or wiring harness not properly secured resulting in movement
On low current signal circuits this condition may cause high resistance, resulting in intermittent connections.
On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative.

Representative List of Control Modules and Components

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer

Interest for Relay Module: > 09-06-03-004D > Page 18

Century L4-2.2L VIN 4 (1994)

This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electricalcontact surfaces of the connection or connector. This may be caused by any of the following conditions:

The following is only a representative list of control modules and components that may be affected by this connection or connector condition and include every possible module or component for every vehicle. DOESNOT

- Blower Control Module

- Body Control Module (BCM)

- Communication Interface Module (CIM)

- Cooling Fan Control Module

- Electronic Brake Control Module (EBCM)

- Electronic Brake and Traction Control Module (EBTCM)

- Electronic Suspension Control (ESC) Module

- Engine Control Module (ECM)

- Heating, Ventilation and Air Conditioning (HVAC) Control Module

- HVAC Actuator

- Inflatable Restraint Sensing and Diagnostic Module (SDM)

- Any AIR BAG module

- Seatbelt Lap Anchor Pretensioner

- Seatbelt Retractor Pretensioner

- An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023

- Powertrain Control Module (PCM)

- Remote Control Door Lock Receiver (RCDLR)

- Transmission Control Module (TCM)

Correction

replace the control module, wiring or component for the following conditions: ImportantDO NOT

-

be duplicated. The condition is intermittent and cannot

-

be duplicated. The condition is present and by disconnecting and reconnecting the connector the condition can no longer

Use the following procedure to correct the conditions listed above.

1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the

control modules (refer to SI).
If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component

which may be causing the condition (refer to SI).

If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the

condition (refer to SI).

2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator

documents to locate and disconnect the affected harness connector(s) which are causing the condition.

ImportantDO NOT

apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate theconnectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin.

3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s).

4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer

Interest for Relay Module: > 09-06-03-004D > Page 19

Century L4-2.2L VIN 4 (1994)

Note

Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severecases it may be unable to be seen or identified without the use of a magnifying glass.

- DTC Diagnostic Procedure

- Circuit/System Description

- Conditions for Running the DTC

- Conditions for Setting the DTC

- Diagnostic Aids

- Circuit/System Verification

If the condition cannot be duplicated, the repair is complete. If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI).

Repair Order Documentation

be documented on the repair order. Failure to do so may result in a chargeback.ImportantThe following information MUST

- Customer vehicle condition.

- Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message.

- Was a DTC(s) set? If yes, specify which DTC(s) were set.

- After following the procedure contained within this bulletin, could the condition be duplicated?

If the condition duplicated, then document the affected module/component connector name and number on the repair order. was not

-

was

If the condition duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement ofa module or component, the SI Document ID Number be written on the repair order. MUST

Parts Information

Alternate Distributor For All of North America
Note

NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in thisbulletin.

*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does notendorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be availablefrom other sources.

Warranty Information (excluding Saab Models)

For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectriclubricant was applied to:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer

Interest for Relay Module: > 09-06-03-004D > Page 20

Century L4-2.2L VIN 4 (1994)

Warranty Information (Saab Models)

For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectriclubricant was applied to refer to the table above.

Disclaimer

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Relay Module: > 09-06-03-

004D

Relay Module: All Technical Service BulletinsElectrical - MIL ON/DTC's Set By Various Control Modules
TECHNICAL

09-06-03-004DBulletin No.:

December 08, 2010Date:

Subject:

Intermittent No Crank/No Start, No Module Communication, MIL, Warning Lights, Vehicle Messages or DTCs Set by Various ControlModules - Diagnosing and Repairing Fretting Corrosion (Disconnect Affected Connector and Apply Dielectric Lubricant)

Models:

2011 and Prior GM Passenger Cars and Trucks

Attention:

This repair can be applied to ANY electrical connection including, but not limited to: lighting, body electrical, in-line connections, powertrain controlsensors, etc. DO NOT over apply lubricant to the point where it prevents the full engagement of sealed connectors. A light coating on the terminalsurfaces is sufficient to correct the condition.

Supercede:This bulletin is being revised to update the Attention statement and add the 2011 model year. Please discard Corporate Bulletin Number 09-06-03-004C(Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on any of the following conditions:

- An intermittent no crank/no start

- Intermittent malfunction indicator lamp (MIL) illumination

- Intermittent service lamp illumination

- Intermittent service message(s) being displayed
The technician may determine that he is unable to duplicate the intermittent condition.

Cause

- Vibration

- Thermal cycling

- Poor connection/terminal retention

- Micro motion

- A connector, component or wiring harness not properly secured resulting in movement
On low current signal circuits this condition may cause high resistance, resulting in intermittent connections.
On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative.

Representative List of Control Modules and Components

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical

Service Bulletins for Relay Module: > 09-06-03-004D > Page 23

Century L4-2.2L VIN 4 (1994)

This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electricalcontact surfaces of the connection or connector. This may be caused by any of the following conditions:

The following is only a representative list of control modules and components that may be affected by this connection or connector condition and include every possible module or component for every vehicle. DOESNOT

- Blower Control Module

- Body Control Module (BCM)

- Communication Interface Module (CIM)

- Cooling Fan Control Module

- Electronic Brake Control Module (EBCM)

- Electronic Brake and Traction Control Module (EBTCM)

- Electronic Suspension Control (ESC) Module

- Engine Control Module (ECM)

- Heating, Ventilation and Air Conditioning (HVAC) Control Module

- HVAC Actuator

- Inflatable Restraint Sensing and Diagnostic Module (SDM)

- Any AIR BAG module

- Seatbelt Lap Anchor Pretensioner

- Seatbelt Retractor Pretensioner

- An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023

- Powertrain Control Module (PCM)

- Remote Control Door Lock Receiver (RCDLR)

- Transmission Control Module (TCM)

Correction

replace the control module, wiring or component for the following conditions: ImportantDO NOT

-

be duplicated. The condition is intermittent and cannot

-

be duplicated. The condition is present and by disconnecting and reconnecting the connector the condition can no longer

Use the following procedure to correct the conditions listed above.

1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the

control modules (refer to SI).
If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component

which may be causing the condition (refer to SI).

If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the

condition (refer to SI).

2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator

documents to locate and disconnect the affected harness connector(s) which are causing the condition.

ImportantDO NOT

apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate theconnectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin.

3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s).

4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical

Service Bulletins for Relay Module: > 09-06-03-004D > Page 24

Century L4-2.2L VIN 4 (1994)

Note

Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severecases it may be unable to be seen or identified without the use of a magnifying glass.

- DTC Diagnostic Procedure

- Circuit/System Description

- Conditions for Running the DTC

- Conditions for Setting the DTC

- Diagnostic Aids

- Circuit/System Verification

If the condition cannot be duplicated, the repair is complete. If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI).

Repair Order Documentation

be documented on the repair order. Failure to do so may result in a chargeback.ImportantThe following information MUST

- Customer vehicle condition.

- Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message.

- Was a DTC(s) set? If yes, specify which DTC(s) were set.

- After following the procedure contained within this bulletin, could the condition be duplicated?

If the condition duplicated, then document the affected module/component connector name and number on the repair order. was not

-

was

If the condition duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement ofa module or component, the SI Document ID Number be written on the repair order. MUST

Parts Information

Alternate Distributor For All of North America
Note

NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in thisbulletin.

*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does notendorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be availablefrom other sources.

Warranty Information (excluding Saab Models)

For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectriclubricant was applied to:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical

Service Bulletins for Relay Module: > 09-06-03-004D > Page 25

Century L4-2.2L VIN 4 (1994)

Warranty Information (Saab Models)

For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectriclubricant was applied to refer to the table above.

Disclaimer

> Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Technical Service Bulletins > Auto Unlock Module - Location

Door Module: Technical Service BulletinsAuto Unlock Module - Location

File In Section: 8 - Chassis/Body Electrical
Bulletin No.: 43-81-30
Date: November, 1994

Subject:Section 8A - Auto Unlock Module Location

Models:1994 Buick Century1994 Oldsmobile Cutlass Ciera

This bulletin contains revisions to Section 8A-11, 8A-14, 8A-131 and 8A-201.
Auto unlock module is located on the LH side of I/P (Instrument Panel) left of the steering column.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations

LH Side Of Luggage Compartment

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 34

Keyless Entry Module: Diagrams

Remote Keyless Entry (RKE) Module

Remote Keyless Entry (RKE) Module

> Relays and Modules > Relays and Modules - Body and Frame > Auto Door Unlock Module <--> [Power Door Lock Control Module] > Component Information > Locations

Auto Door Unlock Module: Locations

NOTE: The OEM service manual does not provide a location image for this module.

Auto Door Unlock Module is located at the RH side of I/P heater duct.

> Relays and Modules > Relays and Modules - Body and Frame > Auto Door Unlock Module <--> [Power Door Lock Control Module] > Component Information > Locations > Page 38

Autodoor Unlock Module

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > Component Locations

Power Door Lock Relay: Component Locations

RH Shroud And Door

The Door Lock Relay Assembly is located on the RH shroud.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > Component Locations > Page 43

RH Shroud And Door

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > Page 44

Door Lock Relay Assembly

> Relays and Modules > Relays and Modules - Body and Frame > Trunk / Liftgate Relay > Component Information > Locations

Behind Center Of I/P

> Relays and Modules > Relays and Modules - Body and Frame > Trunk / Liftgate Relay > Component Information > Locations > Page 48

Release Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations

RH Rear Of Engine Compartment

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 53

Electronic Brake Control Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Solenoid Valve Relay > Component Information > Locations > LH Front

Brake Fluid Solenoid Valve Relay: LocationsLH Front

LH Rear Of Engine Compartment

Left Front ABS Solenoid is located at the LH side of shock tower, on ABS Master Cylinder

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Solenoid Valve Relay > Component Information > Locations > LH Front > Page 58

LH Rear Of Engine Compartment

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module:

> 73-50-26

Electronic Brake Control Module: Customer InterestBrakes - ABS Light ON, DTC 46 & 86 (C1246 & C1286)

File In Section: 5 - Brakes
Bulletin No.: 73-50-26
Date: August, 1997

Subject: ABS Light On - DTC's 46 and 86 Set(Perform Diagnostic Procedure, Replace Center ABS Motor Pinion)

Models: 1991-97 Buick Skylark1992-97 Buick Regal1994-97 Buick Century1992-96 Chevrolet Beretta, Corsica, Lumina APV1992-97 Chevrolet Cavalier, Lumina,1993-97 Chevrolet Camaro1995-97 Chevrolet Monte Carlo1997

Chevrolet Malibu, Venture

1993-97 Geo Prizm1995-97 Geo Metro1996-97 Geo Tracker1991

Oldsmobile Calais

1992-96 Oldsmobile Cutlass Ciera1992-97 Oldsmobile Achieva, Cutlass Supreme, Silhouette1997

Oldsmobile Cutlass

1998 Oldsmobile Intrigue

1991-97 Pontiac Grand Am1992-94 Pontiac Sunbird1992-97 Pontiac Grand Prix, Trans Sport1993-97 Pontiac Firebird, Trans Am1995-97 Pontiac Sunfire
Condition

Some owners may comment that the ABS light is on with Diagnostic Trouble Codes (DTC's) 46 and 86 set (rear ABS channel will not move) as currentor history. (DTC's 46 and 86 will be displayed as C1246 and C1286 on 1997 and 1998 model year vehicles).
Cause

A condition exists where the ABS motor pack gear (pinion) will bind on the motor armature shaft causing the motor not to move when commanded bythe EBCM. This condition is aggravated by light corrosion between the pinion and shaft. Therefore, it may occur more frequently when the weather ishot and humid.

Important:

Other EBCM and ABS motor pack concerns can also cause this condition, but they are not as common as the above cause.

Correction

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins >

Customer Interest for Electronic Brake Control Module: > 73-50-26 > Page 64

Century L4-2.2L VIN 4 (1994)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins >

Customer Interest for Electronic Brake Control Module: > 73-50-26 > Page 65

Century L4-2.2L VIN 4 (1994)

Follow the included procedure (Attachments 1 and 2) for diagnosis. This condition may correct itself before the owner is able to bring the vehicle in forservice. Therefore, if DTC 46 is set in history, and is not currently setting, the included procedure will instruct you to replace the center ABS motorpinion. The new pinion has a Teflon insert which reduces friction between the pinion and motor armature shaft.
Pinion Replacement

If the included procedure instructs you to replace the center ABS motor pinion, use P/N 18029776. Please note that the new pinion is a directreplacement part which requires no modifications to the motor shaft. Follow the pinion replacement procedure included with the new pinion. Completemotor pack replacement is not required.
Parts Information

Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Labor Time

H2506 Use published labor

operation time.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake

Control Module: > 73-50-26

Electronic Brake Control Module: All Technical Service BulletinsBrakes - ABS Light ON, DTC 46 & 86 (C1246 & C1286)

File In Section: 5 - Brakes
Bulletin No.: 73-50-26
Date: August, 1997

Subject: ABS Light On - DTC's 46 and 86 Set(Perform Diagnostic Procedure, Replace Center ABS Motor Pinion)

Models: 1991-97 Buick Skylark1992-97 Buick Regal1994-97 Buick Century1992-96 Chevrolet Beretta, Corsica, Lumina APV1992-97 Chevrolet Cavalier, Lumina,1993-97 Chevrolet Camaro1995-97 Chevrolet Monte Carlo1997

Chevrolet Malibu, Venture

1993-97 Geo Prizm1995-97 Geo Metro1996-97 Geo Tracker1991

Oldsmobile Calais

1992-96 Oldsmobile Cutlass Ciera1992-97 Oldsmobile Achieva, Cutlass Supreme, Silhouette1997

Oldsmobile Cutlass

1998 Oldsmobile Intrigue

1991-97 Pontiac Grand Am1992-94 Pontiac Sunbird1992-97 Pontiac Grand Prix, Trans Sport1993-97 Pontiac Firebird, Trans Am1995-97 Pontiac Sunfire
Condition

Some owners may comment that the ABS light is on with Diagnostic Trouble Codes (DTC's) 46 and 86 set (rear ABS channel will not move) as currentor history. (DTC's 46 and 86 will be displayed as C1246 and C1286 on 1997 and 1998 model year vehicles).
Cause

A condition exists where the ABS motor pack gear (pinion) will bind on the motor armature shaft causing the motor not to move when commanded bythe EBCM. This condition is aggravated by light corrosion between the pinion and shaft. Therefore, it may occur more frequently when the weather ishot and humid.

Important:

Other EBCM and ABS motor pack concerns can also cause this condition, but they are not as common as the above cause.

Correction

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins for Electronic Brake Control Module: > 73-50-26 > Page 68

Century L4-2.2L VIN 4 (1994)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins for Electronic Brake Control Module: > 73-50-26 > Page 69

Century L4-2.2L VIN 4 (1994)

Follow the included procedure (Attachments 1 and 2) for diagnosis. This condition may correct itself before the owner is able to bring the vehicle in forservice. Therefore, if DTC 46 is set in history, and is not currently setting, the included procedure will instruct you to replace the center ABS motorpinion. The new pinion has a Teflon insert which reduces friction between the pinion and motor armature shaft.
Pinion Replacement

If the included procedure instructs you to replace the center ABS motor pinion, use P/N 18029776. Please note that the new pinion is a directreplacement part which requires no modifications to the motor shaft. Follow the pinion replacement procedure included with the new pinion. Completemotor pack replacement is not required.
Parts Information

Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Labor Time

H2506 Use published labor

operation time.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > Antilock Brake Module

Electronic Brake Control Module: LocationsAntilock Brake Module

Fig. 1 TYPICAL ABS Components

Refer to for system component locations.Fig. 1

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > Antilock Brake Module > Page 72

Behind RH Side Of I/P

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > EBCM 2 Pin Connector

Electronic Brake Control Module: DiagramsEBCM 2 Pin Connector

Fig. 31 EBCM 2-pin Connector Face View.

When performing diagnostic procedures refer to for EBCM connector terminal identification.Fig. 31

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > EBCM 2 Pin Connector > Page 75

Electronic Brake Control Module (EBCM)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > EBCM 2 Pin Connector > Page 76

Electronic Brake Control Module: DiagramsPinout Description

Electronic Brake Control Module (EBCM) (Part 1 Of 2)

Electronic Brake Control Module (EBCM) (Part 2 Of 2)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Page 77

Electronic Brake Control Module: Description and Operation
DESCRIPTION

The ABS system is controlled by a microprocessor based Electronic Brake Control Module (EBCM). Inputs to the system include four wheelspeed sensors, brakes, ignition switch and unswitched battery voltage. Outputs include three bi-directional motor controls, three lamp controls, twosolenoid controls and the system enable relay. A serial data line, located in terminal 9 of the Data Link Connector (DLC), is provided for servicediagnostic tools and assembly plant testing.

The EBCM monitors the speed of each wheel. If any wheel begins to approach lock-up and the brake switch is on, the EBCM controls the motorsand solenoids to reduce brake pressure to the wheel approaching lock-up. Once the wheel regains traction, brake pressure is increased until wheelbegins to approach lock-up. This cycle repeats until either vehicle comes to a stop, the brake is released or no wheels approach lock-up.Additionally, the EBCM monitors itself, each input and each output for proper operation. If any system fault is detected, the EBCM will store aDTC in nonvolatile memory.

On a EBTCM, the ABS portion of the module operates the same as a EBCM. A EBTCM is used if the vehicle is equipped with either theEnhanced Traction System (ETS) or Traction Control System (TCS). The ETS or TCS portion of the EBTCM monitors wheel spin slip throughthe drive wheels speed sensors. If the wheels begin to slip, the EBTCM determines the desired wheel torque needed to minimize wheel slip. Thisinformation is sent to the PCM through the Serial data link. On models equipped w/ETS, the PCM controls engine torque by ignition retard andtransmission shifts. On models equipped w/TCS, the PCM controls engine torque by ignition retard, transmission shifts and applies brakes severaltimes until the vehicle regains traction. Once the vehicle regains traction, brake pressure is decreased and engine torque reduction is no longerrequested. This cycle repeats until traction control is no longer necessary.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Page 78

Electronic Brake Control Module: Service and Repair

Fig. 800 EBCM Assembly Removal.

Fig.800

1. Disconnect EBCM electrical connectors, .2. Remove ECU to dash panel attaching screws, then the ECU from dash panel.3. Reverse procedure to install, noting the following:

a. Ensure plastic grommets, if equipped, are located properly.b. Bleed brake system as described under . See: Brakes and Traction Control/Brake BleedingBrake System Bleed

> Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations

RH Front Of Engine Compartment

> Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 83

A/C Compressor Control Relay, Primary Coolant Fan Relay, Pusher Coolant Fan Relay

> Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 84

Radiator Cooling Fan Motor Relay: Description and Operation

Cooling Fan Circuit

> Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 85

Century L4-2.2L VIN 4 (1994)

Quad-Driver Module (QDM 2) Circuit

PURPOSE:

The electric Cooling Fans are used for engine and A/C condenser cooling and are controlled by the PCM.

The PCM provides the ground for the coils within the cooling fan relays. As the ground is completed, the magnetic field generated closes theswitch in the relay allowing current flow to the cooling fan motors.

OPERATION:

will be turned "ON" by any of the following criteria:Primary Fan -

^ Engine coolant temperature (ECT) sensor signal indicating a temperature greater than 106C (226F)
^ A/C is requested at any vehicle speed
^ A/C pressure sensor switch is "open", pressure greater than 200 psi.
^ When PCM is in backup mode

will be turned "ON" with any of the following criteria:Auxiliary Fan -

^ Engine coolant temperature (ECT) sensor signal indicating a temperature greater than 123C (253F) and A/C "OFF".
^ A/C is requested and vehicle speed less than 40 mph
^ A/C pressure sensor switch is "open", pressure greater than 200 psi

> Relays and Modules > Relays and Modules - Cruise Control > Cruise Control Module > Component Information > Locations

LH Side Of Engine Compartment

> Relays and Modules > Relays and Modules - Cruise Control > Cruise Control Module > Component Information > Locations > Page 90

Cruise Control Module: Diagrams

Cruise Control Module

Cruise Control Module

> Relays and Modules > Relays and Modules - Cruise Control > Cruise Control Module > Component Information > Locations > Page 91

Cruise Control Module: Description and Operation
OPERATION

The module will interpret the position of the servo, the position of the control switches and the output of the speed sensor. In response to these inputs,the module electrically signals the opening or closing of the vent and vacuum solenoid valves in the servo.

The module is mounted on the dash support bracket at the right side of the steering column, but is integral with the ECM on some models with certainengines.

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

RH Front Of Engine Compartment

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 96

Blower Motor High Speed And Fuel Pump Relay

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

Compressor Clutch Relay: Locations

Right Front Of Engine Compartment

The A/C relay is mounted to the multi use relay bracket, located in the front right of engine compartment.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 100

A/C Compressor Control Relay, Primary Coolant Fan Relay, Pusher Coolant Fan Relay