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Intermittent Failures

  1. Indicator Failure

    If tests of warning light does not prove out, connect breakout box to ABCM with adapter cable. Connect breakout box pin No. 1 (if testing ABS warning light) or pin No. 4 (if testing Red brake warning light) to ground pin with 10-amp in-line fuse.
  2. Turn ignition on. Wiggle wire harness at several point between ABCM and instrument cluster. If warning light flickers, repair or replace respective wiring circuit.

  1. Sensor Failure

    Connect breakout box with adapter to ABCM. Disconnect suspect ABS sensor. Check sensor harness for short-to-ground. Use an 88 digital multimeter (or equivalent) with "minimum resistance hold" feature on. Check resistance between breakout box pins for suspect ABS sensor. See ABS SENSOR PIN CHART . Drive over rough roads. If there is continuity between either circuit and ground, repair circuit for short-to-ground.
  2. To check for open circuit, connect jumper to suspect ABS sensor connector terminals. Attach digital multimeter with "minimum resistance hold" turned on. Drive over rough roads. Repeat test drive with Maximum Resistance Hold feature on. If an open circuit is detected between suspect ABS sensor pins, repair open in that wire circuit.
  3. Using an 88 digital multimeter with Maximum Resistance Hold feature on, monitor resistance between suspect ABS sensor terminals while wiggling connector. If testing front ABS sensor, resistance should be 4000 ohms. For rear ABS sensor, resistance should be 2500 ohms. If resistance is more than specified, replace suspect ABS sensor.
  4. Using an 88 digital multimeter with Minimum Resistance Hold feature on, monitor resistance between suspect ABS sensor terminals while wiggling connector. If testing front ABS sensor, resistance should be 2000 ohms. For rear ABS sensor, resistance should be 800 ohms. If resistance is more than specified, replace suspect ABS sensor.
ABS SENSOR PIN CHART

Sensor Breakout Box Pins No. (Wire Colors)
LF 11 (Tan/Orn) & 23 (Tan/Blk)
RF 10 (Yel/Red) & 22 (Yel/Blk)
Rear 9 (Red/Pnk) & 21 (LtGrn/Blk)
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