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

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

C1:

C2-C3:

Normal Operation
The ABS module communicates with the diagnostic tool through the high speed controller area network (CAN), circuits VDB04 (WH/BU) and VDB05 (WH).

Check the high speed CAN circuits VDB04 (WH/BU) and VDB05 (WH) between the ABS module C135 and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the DLC C251, damage to the ABS module C135, or a problem in an in-line connector.

Possible Causes
- high speed CAN data plus circuit VDB04 (WH/BU) open
- high speed CAN data minus circuit VDB05 (WH) open
- ABS module C135
- ABS module