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-B2:

B3-B4:

Normal Operation
The ABS module communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits 1908 (WH) (HS-CAN +) and 1909 (BK) (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 four wheel drive (4WD) control module, and the instrument cluster. Voltage for the ABS module is provided by circuits 483 (RD) and 677 (LB), and ground is provided by circuit 570 (BK/WH).

Possible Causes
- Fuse
- Circuit 483 (RD) open
- Circuit 570 (BK/WH) open
- Circuit 677 (LB) open
- Circuit 1908 (WH) open (HS-CAN +)
- Circuit 1909 (BK) open (HS-CAN -)
- ABS module