The electronic brake control module (EBCM) monitors brake pedal position through the stop lamp switch. The stop lamp switch is closed when the brake pedal is pressed and the stop lamp switch opens when the brake pedal is released. When the stop lamp switch is closed, the EBCM receives a voltage signal from the stop lamp switch. The stop lamp switch receives power from the STOP fuse.

DTC C1249 can be set anytime.

The EBCM detects an open in the stop lamp switch circuit.

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Verify the brake lamps operate.

1. Ignition OFF, disconnect the EBCM connector.
2. Ignition ON, check for 8-14V between EBCM connector terminal 2 and ground with brake pedal applied and less than 1.5V with braked pedal released.

⇒	If the voltage is not as specified, test the circuit for a short to ground or an open/high resistance.

3. Ignition ON, check for 11-14V between terminals, 12, 24, 34 and ground.

⇒	If the voltage is not as specified, test the B+ circuit for a short to ground or an open/high resistance.

4. Test for less than 1 ohm between the terminals 1, 13 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the BPMV/EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.