Symptom Related Diagnostic Procedures

Brake Warning Indicator Inoperative

Circuit Description

Battery voltage is supplied to the EBD warning lamp with the ignition switch in the ON or START position. The warning lamp can be activated only by the antilock brake system (ABS) control module internally supplying ground to terminal 21.

This procedure checks for a problem in the wiring, a faulty ground, a voltage supply problem, a burned out indicator lamp, or a contact problem in a connector.

Conditions for Setting the DTC

* A fuse has blown.
* The indicator lamp has burned out.
* There is a corroded or broken connector terminal.
* There is a faulty ground connection.
* There is a broken wire in a wiring harness.
* The electronic brake control module (EBCM) is faulty.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
1. This test checks for any DTCs that may cause the EBD indicator lamp to be inoperative.
2. This test verifies an inoperative lamp condition.
3. This test inspects for voltage on the lamp circuit.
4. This begins a series of tests of the circuit from the indicator lamp to the EBCM and ground.
19. This begins a series of tests of the voltage supply circuits that power the indicator lamp.