Circuit Description
The EBCM illuminates the service brake soon indicator by applying ground to the lamp.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests if the EBCM is applying ground to the brake indicator signal circuit.
-
This step tests for a short to ground in the brake indicator signal circuit by substituting the telltale circuit board with a test lamp.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Brake Warning System Schematics Important: After DTC C0272 is cleared and the ignition is ON, the service brake soon indicator may remain ON until the vehicle is operated at a speed greater than 10 km/h (6 mph). | |||
1 | Did you perform the hydraulic brake Diagnostic System Check? | Go to Step 2 | |
2 | Turn ON the ignition while observing the service brake soon indicator. Does the service brake soon indicator illuminate for 3 seconds and then turn OFF? | Go to Testing for Electrical Intermittents in Wiring Systems | Go to Step 3 |
Does the service brake soon indicator illuminate? | Go to Step 4 | Go to Step 7 | |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 6 | |
5 | Repair the short to ground in the brake indicator signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 8 | -- |
6 | Replace the telltale circuit board. Refer to Telltale Circuit Board Replacement in Instrument Panel, Gages and Console. Did you complete the replacement? | Go to Step 8 | -- |
7 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size/Wheel Base Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System. Did you complete the replacement? | Go to Step 8 | -- |
8 | Turn ON the ignition while observing the service brake soon indicator. Does the service brake soon indicator illuminate for 3 seconds and then turn OFF? | System OK | Go to Step 3 |
