Fault Code Guide

Connector B1 Forward Chassis Harness Pinouts
Connector Pin Signal Name Signal Type
B1-J Battery Power (VBAT5) Power
B1-K Tail Lamps/License Plate Lamp/Trailer Tail Relay Digital Output
B1-L Left High Beam Digital Output
B1-M Fuel/Water Separator (spare digital input 5) Digital Input
B1-N Battery Power (VBAT3) Power
B1-P ABS Ignition Power Digital Output
B1-R Left Low Beam Digital Output
B1-S J1587– Datalink Datalink
Table 1, Connector B1 Forward Chassis Harness Pinouts
Connector B2 Engine Harness Pinouts
Connector Pin Signal Name Signal Type
B2-A J1587+ Datalink Datalink
B2-B J1939+ Datalink Datalink
B2-C J1587+ Datalink Datalink
B2-D J1587– Datalink Datalink
B2-E — —
B2-F — —
B2-G Backup Switch (spare digital input 3) Digital Input
B2-H J1587– Datalink Datalink
B2-J J1939– Datalink Datalink
B2-K Engine ECU Ignition Power Digital Output
B2-L Transmission ECU Ignition Power Digital Output
B2-M A/C Clutch Digital Output
B2-N — —
B2-P Alternator Charging Digital Input
Table 2, Connector B2 Engine Harness Pinouts
Connector B3 Frontwall Harness Pinouts
Connector Pin Signal Name Signal Type
B3-A J1939– Datalink Datalink
B3-B J1939+ Datalink Datalink
B3-C Wiper Parked Position Digital Input
B3-D Main Battery Power (VBAT1) Power
B3-E Horn Digital Output
B3-F Wiper Motor High Speed Digital Output
Bulkhead Module 54.12
Specifications
Business Class M2 Workshop Manual, Supplement 10, September 2006 400/3