Test B: The Anti-Lock Brake (ABS) Module Does Not Respond To The Scan Tool

PINPOINT TEST B: THE ANTI-LOCK BRAKE (ABS) MODULE DOES NOT RESPOND TO THE SCAN TOOL

B1-B2:

B3-B4:

Normal Operation
The ABS module communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits 1827 (WH/LG) (HS-CAN +) and 1828 (PK/LG) (HS-CAN -) provide the network connection to the ABS module. The ABS module shares the HS-CAN network with the powertrain control module (PCM), the instrument cluster and the air suspension module. Voltage for the ABS module is provided by circuits 1003 (GY/YE), 483 (RD) and 601 (LB/PK) and ground is provided by circuit 57 (BK).

DTC U0073 (ABS module) - sets when the HS-CAN bus performance is compromised.

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 1003 (GY/YE) open
- Circuit 483 (RD) open
- Circuit 601 (LB/PK) open
- Circuit 1827 (WH/LG) open (HS-CAN +)
- Circuit 1828 (PK/LG) open (HS-CAN -)
- ABS module