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

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


B1:






B1-B3:






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 air suspension module or variable assist power steering (VAPS) module, the instrument cluster and the fire suppression module (if equipped). Voltage for the ABS module is provided by circuits 483 (RD), 601 (LB/PK) and 1003 (GY/YE) and ground is provided by circuit 57 (BK).

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 483 (RD) open
- Circuit 601 (LB/PK) open
- Circuit 1003 (GY/YE) open
- Circuit 1812 (BR/WH) open
- Circuit 1827 (WH/LG) open (HS-CAN +)
- Circuit 1828 (PK/LG) open (HS-CAN -)
- ABS module
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