Fault Code Guide

Circuit Wire Numbers and Descriptions, "D" Version
Pin Connector Pin Number
Vehicle Wire
Number
WABCO Circuit
Description
12-Pin Gray X1
1 — Not Used
2 GND Ground
3 378LFI Left Front Inlet Valve
4 378RFI Right Front Inlet Valve
5 378LRI Left Rear Inlet Valve
6 378RRI Right Rear Inlet Valve
7 378RRO Right Rear Outlet Valve
8 376LRO Left Rear Outlet Valve
9 378RFO Right Front Outlet Valve
10 378LFO Left Front Outlet Valve
11 — Not Used
12 — Not Used
12-Pin Black X2
1 J1587– SAE J1587 (–)
2 376C ECU Ignition Supply
3 376A ECU Supply/Battery
4 376L1 Warning Light Relay
5 — Not Used
6 376H Pump Relay
7 376R Retarder Relay
8 376L ABS Indicator Light
9 GND Ground
10 376B Motor Monitor
11 376A ECU Supply/Battery
12 J1587+ SAE J1587 (+)
Meritor WABCO Hydraulic Antilock Braking System (ABS) 42.26
Troubleshooting
Business Class M2 Workshop Manual, Supplement 4, March 2003300/8