No Response From ABS (Antilock Brake Module)
NO RESPONSE FROM ABS (ANTILOCK BRAKE MODULE)No Response From ABS (Antilock Brake Module):
POSSIBLE CAUSES
- (A921) (A922) Fused B(+) circuit open or shorted
- (Z902) Ground circuit open
- (F20) Fused ignition switch output circuit open or shorted
- (D65) CAN C BUS (+) circuit open
- (D64) CAN C BUS (-) circuit open
- Antilock brake module
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
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.
- Check the TIPM for any active CAN C hardware DTCs, perform DTC before proceeding.
Q: 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. (A921) (A922) FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Using a 12-volt test light connected to ground, check each (A921) and (A922) Fused B(+) circuit.
Q: 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 ABS VERIFICATION TEST - VER 1. ABS Verification Test
3. (Z902) GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, check each (Z902) ground circuit.
Q: Does the test light illuminate brightly for each circuit?
YES: Go To 4
NO: Repair the (Z902) ground circuit for an open. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
4. (F20) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F20) Fused Ignition Switch Output circuit.
Q: Does the test light illuminate brightly?
YES: Go To 5
NO: Repair the (F20) Fused Ignition Switch Output circuit for an open or short. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
5. (D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the TIPM C3 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM connector and the Antilock Brake Module connector.
Q: Is resistance below 5.0 ohms?
YES: Go To 6
NO: Repair the (D65) CAN C Bus (+) circuit for an open. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
6. (D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM connector and the Antilock Brake Module connector.
Q: Is resistance below 5.0 ohms?
YES: Replace the Antilock Brake Module. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
NO: Repair the (D64) CAN C Bus (-) circuit for an open. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test