ABS Indicator Always On

Circuit Description
The Instrument Panel Cluster (IPC) turns the ABS Indicator lamp ON at bulb check for approximately 2 seconds when the ignition switch is turned to the ON position. Afterwards, the EBCM sends a class 2 message the IPC which commands the ABS indicator lamp OFF. If the EBCM sets a Diagnostic Trouble Code (DTC), the EBCM sends a class 2 message to the IPC to command the ABS indicator lamp ON.

Diagnostic Aids
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
- Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness

- The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation

- If an intermittent malfunction exists refer to Testing for Intermittent and Poor Connections in Wiring Systems.

2. The EBCM turns Off the ABS and BRAKE indicator lamps after bulb test. This step shows the EBCMs ability turn off the BRAKE indicator lamp.