TCS Active Lamp on

TCS Active Lamp ON






Circuit Description
The Electronic Brake Control Module (EBCM) controls the operation of the TCS active lamp. Battery voltage is supplied to the I/P Cluster terminal B14 when the ignition switch is turned on EBCM terminals 9 and 25 are hot at all times.

When the EBCM commands the TCS active lamp off, the EBCM will ground the TCS active lamp control circuit. This causes the lamp Driver Module to open the path to ground for the bulb.

When the ignition switch is turned to the ON position, the EBCM turns ON the TCS active lamp for 3 seconds for a bulb check.

Whenever a malfunction is detected within the general brake system or DDRP, the EBCM turns ON the TCS active lamp, notifying the driver the brake system or DDRP needs to be serviced.

Diagnostic Aids
Typical cause of the TCS Lamp ON with no DTC(s) set is mainly EBCM wiring harness short to battery.





Troubleshooting