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Troubleshooting DTC 6-4: Rear Fail-safe Relay The ABS control unit monitors the voltage from the battery for the six solenoids during the initial diagnosis when the fail- safe relays are OFF. The ABS control unit keeps the ABS indicator light on if it detects the battery voltage at the two rear solenoid circuits. Possible causes: Rear fail-safe relay stuck ON Short to power in the solenoid drive circuits between the rear fail-safe relay and ABS control unit Does the ABS indicator light go The ABS is OK at this time. Check noid and rear fail-safe relay Is code 6-4 indicated? Perform the appropriate trouble- Check the rear fail-safe relay (see ). Is the relay OK? Replace the rear fail-safe relay. Check the modulator wire har- ness: 14P connector. 2. Visually check the modulator wire harness. Is there a short to power? Replace the modulator wire har- Confirm the DTC that appears first. Problem verification: With engine running, ABS indi- Main Menu Table of Contents |