Rear Anti-Lock Brakes (RABS)

Component Test Intermittent Failures

Power/Ground to Anti-Lock Brake Control Module

If the fuse had failed:

A. Check the weather packing of the power connector to the anti-lock brake control module C1041.
B. Remove power distribution box fuse 14 (60A).
C. Measure the resistance between the outside pin of power distribution box fuse 14 (60A) circuit 532 (O/Y) and ground.
D. Spray with water and wiggle the wiring between the power distribution box and the anti-lock brake control module.
E. If any continuity is measured repair/replace the wiring.

Check for opens in wiring:

A. Disconnect the anti-lock brake control module C 1041.
B. While measuring the voltage between anti-lock brake control module C 1041-2 circuit 532 (O/Y) and negative battery post wiggle the wiring harness.
C. If the voltage momentary drops below 10 volts while the harness is wiggled repair or replace the wiring.
D. While measuring the resistance between the anti-lock brake control module C1041-1 circuit 530 (LG/Y) and ground wiggle the wiring harness.
E. If the resistance momentarily goes above 5 ohms while the harness is wiggled repair or replace the wiring.

Indicator Failure

Does not illuminate (prove out):

A. Connect EEC -IV 60-Pin Breakout Box to the EHCU with ABS Adapter Cable.
B. Connect EEC -IV 60-Pin Breakout Box pin 1 (yellow indicator) to the B+ pin.
C. Wiggle the wire harness at the several points between the anti-lock brake control module and the instrument cluster.
D. Repair/replace the wire harness at the location that the indicator flickered off for an open circuit.

Does illuminate (proves out):

A. Wiggle the wire harness at the several points between the anti-lock brake control module and the instrument cluster.
B. Repair/replace the wire harness at the location that the indicator flickered on for a short to ground.

Sensor Failure

1.Connect EEC-IV 60-Pin Breakout Box to the EHCU with ABS Adapter Cable.
2.Disconnect the rear anti-lock brake sensor.
3.Check the harness for short to ground.

1. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

Monitor the resistance between EEC-IV 60-Pin Breakout Box pins and ground as follows:






2. Drive over rough roads at various speeds.
3. If there is continuity between either circuit and ground repair the circuit for a short to ground.

4. Check harness for open circuit.

1. NOTE: Connect jumper securely to the rear sensor connector.

Connect a jumper between the two pins on the rear sensor connector.

2. NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

Monitor the resistance between EEC-IV 60-Pin Breakout Box pins as follows:






3. Drive over rough roads at various speeds.
4. If there is open circuit detected between pins~ repair the circuit(s) for an open circuit.

5.C heck suspect sensor electrical connector.

1. NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

Monitor the resistance between suspect anti-lock brake sensor terminals while wiggling the electrical connector:






2. If the resistance is above specifications~ replace the anti-lock brake sensor.
3. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

Monitor the resistance between rear anti-lock brake sensor terminals while wiggling the electrical connector:






4. If the resistance is below specifications~ replace the rear anti-lock brake sensor.
5. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

Monitor the resistance between an anti-lock brake sensor terminal and ground on the highest resistance scale of the meter~ while wiggling the electrical connector.

6. If the meter shows anything but open circuit~ replace the rear anti-lock brake sensor.