Freightliner M2 2007 Service Manual

EPA 2007 ModelsEPA 2007 Models

Electrical System Overview

2007 M2 Electrical2007 M2 Electrical

Body Builder Reference GuideBody Builder Reference Guide

2007 M2 Electrical Body Builder Reference Title Page Rev New

Body lighting

Interfaces

(Module 353)

Dash Switches

(Module 329)

EPA 2007 ModelsEPA 2007 Models

Electrical Component Overview

Trailer Interfaces

(Module 296, 297)

Tail Light Configurations

(Module 294)

Transmission

(Plugs may also

frame located

be frame located)

(Module )

Interfaces.

(Grey Plug)

(Module , 34C)

Engine Interface

(Black Plug)

(Plugs may also

148, 163, 87L

Air Management

Unit (AMU)

(Multiple Modules )

Chassis Module (CHM)

(Module 335, 32K)

Bulk Head Module

(BMH)

(Module 32A)

Power Distribution (Module 285 PDM)

Power Supply (Module 281)

2007 M2 Electrical Body Builder Reference Page # 1 Rev: New

FORWARD CHASSIS HARNESS Module

1) Connections to Bulkhead module and Underhood PDM

2) Connections to headlamps

3) Connections to side marker/turn lamps

4) Connections to Chassis Module

288

EPA 2007 ModelsEPA 2007 Models

Electrical Harness Overview

ABS/AMU HARNESS Module 332

1) Connections to Forward chassis harness and frame ground studs near Chassis module

2) Connections to AMU (Mod 877 without ABS)

3) Connections to Wabco ABS ECU

4) Connections to rear combo valves

AFT CHASSIS HARNESS Module

1) Connections to Chassis Module

2) Connections to tail lamps

28A

POWERTRAIN HARNESS Module 286, 283

1) Connections to the Bulkhead Module and Underhood PDM

FRONTWALL HARNESS Module 321

1) Connections to Bulkhead Module and Underhood PDM

2) Connection to Starter Mag Switch

3) Connection to Wiper Motor

4) Connection to the low coolant level sensor and horn (under surge tank)

5) Connection under cab to Washer pump and level switch

6) Pass-thru connector to Main Cab Harness and Powertrain Harness

OVERHEAD CAB HARNESS Module 287

1) Inline connection to Main cab Harness (at bottom of A pillar)

2) Connections to Marker Lamps

3) Connections to Dome Lamp

MAIN CAB HARNESS Module

1) Connections to bulkhead connector

2) Connections to diagnostic connector (behind ignition switch)

3) Connections to MBE VCU or CPC

4) Pass-thru connector to engine compartment

5) Gauge Cluster

320

2007 M2 Electrical Body Builder Reference Page # 2 Rev: New

The main Power Distribution Module (PDM) distributes battery power to the various control modules on the vehicle.

The PDM contains mini fuses that

protect

the power feed circuits to these modules.

EPA 2007 ModelsEPA 2007 Models

Main Power Distribution Module (PDM)

Pin part number for harness connection 23-13213-120 TERM-FEMALE,(20-16) PAC12077411 23- -121 TERM- ,(14-12) PAC1212949313213 FEMALE 23-13213-122 TERM-FEMALE,(10) PAC12077413

Multiple Wire output

Pin A & B on Grey

Plug and Pin D

on Blue Plug

PDM Plugs contain output wires

Power Distribution Module Fuse Specications*

Fuse

Location

F1 Vehicle Control Unit (MBE only) 10A

F2 Blower Motor 30A { {

F4 Engine ECU (Caterpillar 2004 EPA) 20A

F5 Ignition Switch 5A { {

F7 Bulkhead Module 30A { {

F8 ICU3-M2 10A { {

F9 Automatic Transmission ECU 10A

F10

F11 Spare { { {

F12 Radio/Diagnostic 20A { {

F13 Chassis Module 30A { {

F14 Spare { { {

F15 Bulkhead Module 30A { {

F16 ABS ECU (pneumatic) 15A

F17 Chassis Module 30A { {

F18 Bulkhead Module 30A { {

F19 Chassis Module 30A { {

F20 Bulkhead Module 30A { {

F21 Spare { { {

F22 Bulkhead Module 30A { {

F23

F24

F25 Spare { { {

F26

MEGA

Fuse

Output

Connection

Green A

Green B

Green H

Green G

Black D

Black C

Gray F

Green C

Green D

Blue G

Green F

Blue H

Black H

Grey E

Black B

Black A

Blue A

Blue C

Blue B

Grey G

Black E

Black F

Black G

Grey H

Blue E

Grey D

Grey C

Grey A

Grey B

Blue D

Primary Function

Engine ECU (MBE or Caterpillar C7 and C9)

{

Spare

Hydraulic Pump and

Motor (hydraulic ABS)

Spare

VBAT

Fuse

VBAT 5 BHM

VBAT 3 CHM

VBAT 4 BHM

VBAT 2 CHM

VBAT 3 BHM

VBAT 1 CHM

VBAT 2 BHM

VBAT 1 BHM

Engine Harness

Plug (Green)

Fuse

Rating

Spare {

Engine ECU (Caterpillar 3126, C11, C13,

20A

C15 ACERT, and Cummins ISC)

Transmission ECU 30A

30A { {

Eaton AutoShift Transmission ECU

{

ABS ECU (hydraulic) 25A

{ {

25A

{

Secondary Function

{

Spare

{

Forward Chassis

Harness Plug (Blue)

Fuse

Rating

30A

{

†

For most trucks there will be spare fuse slots available for

customers to add additional wiring to the truck after

it is

purchased.

There are four Plugs attaching to the Module that supply output connections.

Common Spare fuse sockets are listed below but may vary based on the options that have been requested.

Common Spare Fuse locations F6, F10, F11, F14, F21, F23, F25, F26

Single Wire Output

found on

Green

Plug in Pin G

Mega Fuse 1

Mega Fuse 2

Forward Chassis Harness Plug (Grey)

Front

Wall Harness Plug (Black)

2007 M2 Electrical Body Builder Reference Page # 3 Rev: New

PDM VBAT Fuse Coverage

Power Supply Fuses and Associated Outputs for the Bulkhead Module

BHM Power Input

BHM Power

Input Pin

Power In

VBAT1 B3.D Fuse 22 (30A)

VBAT2 B4.G Fuse 20 (30A)

VBAT3 B1.N Fuse 18 (30A)

VBAT4 B4.K Fuse 15 (30A)

VBAT5 B1.J Fuse 7 (30A)

Fuse Supplying BHM

Power Input

BHM Outputs Supplied

Power Out

Battery (dome lamps)

Battery (smart switches)

Ignition (VCU)

Ignition (engine)

Ignition (ABS)

Ignition (trans)

Fuel Water Sensor Power

Dome Lamps Switched

Left Low Beam

A/C Clutch

Smart Switch 1 Indicator

Smart Switch 2 Indicator

Smart Switch 3 Indicator

Smart Switch 4 Indicator

Smart Switch 5 Indicator

Battery (smart switch)

Accessory (HVAC)

Accessory (radio)

Wake Up (instrument cluster)

Left High Beam

Wiper High

Horn

Wiper Low

Spare 8.0A HSD (ignition)

Panel Lamps

Panel Lamps (smart switch)

Clearance Lamps

Tail Lamps/License Plate Lamp/Trailer Tail

Washer Pump

12V Output (cigar lighter)

Spare 8.5A (utility light/spotlight)

Left Heated Mirror

Right Heated Mirror

Relay

BHM

Output Pin

B5.A

B7.A12

B6.A8

B2.K

B1.P

B2.L

B1.F

B5.B

B1.R

B2.M

B7.B4

B7.B8

B7.A5

B7.A9

B7.B10

B7.A12

B6.A9

B6.A10

B5.D

B1.L

B3.F

B3.E

B3.H

B5.G

B5.H

B7.A1

B5.C

B1.K*

B3.G

B5.F

B5.E / B4.M

B4.F

B4.E

EPA 2007 ModelsEPA 2007 Models

BMH and CHM output pins are powered by multiple VBAT fuses through the Main M2 PDM. If one of these fuses is tripped or blown then all pins in the circuit will be affected. For this reason seemingly unrelated issues can occur at the same time if a fuse is overloaded and trips.

The lists below show which pins are controlled with the VBAT fuses.

Power Supply Fuses and Associated Outputs for the Chassis Module

CHM Power

Input

VBAT1

VBAT2

VBAT3

CHM Power

Input Pin

Power In

C4.P

C3.J

C4.J

Fuse Supplying CHM

Power Input

Fuse 19 (30A)

Fuse 17 (30A)

Fuse 13 (30A)

CHM Outputs Supplied

Power Out

Right Low Beam

Turn Right Front/Side

Turn Right Rear

Right Stop Lamp

Left Stop Lamp

Right DRL

Fog/Road Lamps

Trailer Turn Right

Left Park Lamp

Right Park Lamp

Left Marker Lamp

Right Marker Lamp

Trailer Marker Relay

Right High Beam

Left Backup Lamp

Right Backup Lamp

Backup Alarm

Turn Left Front/Side

Turn Left Rear

Left DRL

Trailer Turn Left

Fuel Water Separator Heater

AMU Solenoid 0

AMU Solenoid 1

AMU Solenoid 2

AMU Solenoid 3

CHM

Output Pin

C3.L

C3.R

C1.P

C1.L

C1.N

C3.K

C3.C/C3.D

C2.E

C4.C

C4.L

C4.D

C4.M

C2.F

C4.K

C1.A

C1.J

C1.H

C3.N

C1.G

C4.F

C2.H

C3.A

C5.H

C5.J

C5.L

C5.M

2007 M2 Electrical Body Builder Reference Page # 4 Rev: New

Bulk Head Module (BHM)

Pin part numbers for harness connection

Outside Cab Connections: 23-13212-120 TERM-FEMALE,(18-16) PAC153047191 23-13212-121 TERM- ,(14-12) PAC15304720 23-13212-122 TERM-FEMALE,(10) PAC15326004

Inside Cab Connections: PAC12146448 TERM-FEMALE,(18-16)

The Bulkhead Module (BHM) is the command module of the M2 electrical system.

FEMALE

EPA 2007 ModelsEPA 2007 Models

B2 Engine

Harness

B1 Forward Chassis

Harness

B3 Front Wall Harness

B4 Front Wall Harness

B5 Dash Harness

B6 Dash Harness

B7 Dash Harness

As primary command the module controls the operation of the other component modules in the either directly or indirectly using messages sent over

system

the J1939 network.

The Bulkhead Module is mounted on the driver side of the front wall and connects to the interior wiring through an opening in the front wall.

The BHM has four harness connections on the engine side of the front wall and three harness connections to the cab interior.

The BHM Unit contains all system parameters and the unit controls power flow and circuit protection to the various components of the M2 electrical system.

The BHM unit can also support up to 5 smart switches. The BHM is

directly programable and can be changed and updated by flashing the unit through service link.

Power supply for the BHM is supplied using VBAT fuses, which reside in the main PDM (see page 3)

The BHM is programmable and the feature screen in service link can be used to change

or add parameters to the BHM

20A

12A

Combined

12A

Combined

12A

Combined

6.7A

Combined

6.7A

Combined

Key Bulkhead Module Outputs

- Bulk Head Module outputs have defined amperage limits.

- If higher loads are required, bulkhead module outputs should be used as signal power in conjunction with a relay.

B5.F - Cigar Lighter Output

B3.E - Horn

B5.E - SPARE (Utility Light/Spotlight) B4.M - SPARE (Utility Light/Spotlight)

B5.G - SPARE (Ignition)

B5.H - Panel Lamps B7.A1 - Panel Lamps (Smart Switch)

B4.F - SPARE (Left Heated Mirror) B4.E - SPARE (Right Heated Mirror)

B6.A9 - Accessory (HVAC)

B6.A10 - Accessory (Radio)

B5.A - Battery (Dome Lamps)

B7.A12 - Battery (Smart Switch)

6.7A

Combined

6.7A

Combined

6.7A

B6.A8 - Ignition (VCU) B2.K - Ignition (Engine) B1.P - Ignition (ABS) B2.L - Ignition (Trans) B1.F - Fuel Water Sensor Power

B5.D - Wake Up (Instrument Cluster)

B5.B - Dome Lamps Switched

B1.L - Left High Beam B1.R - Left Low Beam

B5.C - Clearance Lamps B1.K - Tail/License Plate/Trailer Relay

B3.F - Wiper High

B3.H - Wiper Low B3.G - Washer Pump B2.M - AC Clutch

B4.B - Starter Relay (Crank)

2007 M2 Electrical Body Builder Reference Page # 52007 M2 Electrical Body Builder Reference Page # 5

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