ABS Indicator Always On

ABS Indicator Always On

Circuit Description
The electronic brake control module (EBCM) turns ON the antilock brake system (ABS) indicator by opening the ABS indicator control circuit. The ABS indicator is connected to the GAUGE fuse. This circuit has power when the ignition switch is in the ON or START positions. When the ignition switch is turned to the ON position, the EBCM turns ON the ABS indicator for 3 seconds for a bulb check. If the EBCM detects a malfunction, the ABS indicator will stay ON to warn the driver that the ABS is disabled and needs service.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
^ The connector is off the EBCM.
^ An open or high resistance in the ABS indicator control circuit
^ An open, high resistance, or short in the ignition positive voltage circuit
^ An open or high resistance in the EBCM ground circuits
^ An internal EBCM malfunction
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description





The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the ignition positive voltage circuit for an open or short to ground. This step tests the EBCM ground circuits for an open or high resistance.
5. An open in the ABS indicator control circuit will keep the ABS indicator ON.