No Response From ABS (Antilock Brake Module)

NO RESPONSE FROM ABS (ANTI-LOCK BRAKE SYSTEM MODULE)





For a complete wiring diagram, refer to the Wiring Information.






1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.

NOTE: Make sure the Ignition Off Draw (IOD) fuse is installed and battery voltage is between 10.0 and 16.0 volts.

2. Using the scan tool, select ECU view.

NOTE: A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

NOTE: Check the Body Control Module (BCM) for any active CAN C hardware DTCs, perform DTC before proceeding.

Does the scan tool display a red "X" next to the module?

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. POWER CIRCUITS OPEN OR SHORTED




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Using a 12-volt test light connected to ground, check each Fused B(+) circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 3

No

- Repair the Fused B(+) circuit for an open or short.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

3. GROUND CIRCUIT OPEN




1. Using a 12-volt test light connected to 12-volts, check each Ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 4

No

- Repair the Ground circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

4. CAN C BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Dynamics Sensor harness connector.
3. Measure the resistance of the CAN C Bus (+) circuit between the Dynamics Sensor harness connector and the ABS Module harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the CAN C Bus (+) circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

5. CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the CAN C Bus (-) circuit between the Dynamics Sensor harness connector and the ABS Module harness connector.

Is resistance below 5.0 Ohms?

Yes

- Replace the Antilock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.