No Response From ABS/ESP (Antilock Brake Module)

NO RESPONSE FROM ABS/ESP (ANTILOCK BRAKE MODULE)





For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.






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

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

2. With 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 EIS (Gateway Module) 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. GROUND CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Antilock Brake Module harness connector.
3. Using a 12-volt test light connected to 12-volts and the wiring diagrams as a guide, check each ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 3

No

- Repair the ground circuit for an open.
- Perform ABS VERIFICATION TEST Verification Tests.

3. FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED




1. Turn the ignition on.
2. Using a 12-volt test light connected to ground and the wiring diagrams as a guide, check the Fused Ignition Switch Output circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the Fused Ignition Switch Output circuit for an open or short.
- Perform ABS VERIFICATION TEST Verification Tests.

4. CAN C BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Ignition Switch C4 harness connector.
3. Measure the resistance of the CAN C Bus (+) circuit between the Ignition Switch connector and the Antilock Brake Module connector.

Is resistance below 5.0 ohms?

Yes

- Go To 5

No

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

5. CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the CAN C Bus (-) circuit between the Ignition Switch connector and the Antilock Brake Module connector.

Is resistance below 5.0 ohms?

Yes

- Replace the Antilock Brake Module.
- Perform ABS VERIFICATION TEST Verification Tests.

No

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