Test Description

The number below refers to the step number on the diagnostic table.

2: This step inspects the stop lamp switch operation.

DTC C1249

Step	Action	Values	Yes	No
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Press and release the brake pedal while observing the stop lamps. Do the stop lamps come ON and go OFF?	-	Go to Step 3	Go to Symptoms - Lighting Systems
3	Turn OFF the ignition Disconnect the electronic brake control module (EBCM) connector. Measure the voltage between the stop lamp circuit of the EBCM and a good ground with the brake pedal depressed. Is the voltage within the specified range?	8-14 V	Go to Step 4	Go to Step 6
4	Measure the voltage between the stop lamp circuit of the EBCM and a good ground with the brake pedal released. Is the voltage as specified?	Below 1 V	Go to Step 5	Go to Step 7
5	Test the EBCM ground circuits for an open or high resistance. Did you find and correct the condition?	-	Go to Step 9	Go to Step 8
6	Locate and repair the following in the stop lamp circuit of the EBCM. An open High resistance Short to ground Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 9	-
7	Locate and repair the short to voltage in the stop lamp circuit of the EBCM. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 9	-
8	Replace the brake pressure modulator valve (BPMV). Refer to Brake Modulator Assembly Replacement (With VSC) or Brake Modulator Assembly Replacement (Without VSC) . Did you complete the replacement?	-	Go to Step 9	-
9	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK