TCS Indicator Lamp on

TCS Indicator Lamp ON






Circuit Description
The Electronic Brake Control Module (EBCM) controls the operation of the TCS lamp. Battery voltage is supplied to the I/P Cluster terminal B14 and EBCM terminal All when the ignition switch is turned on EBCM terminals A and B are "hot at all times".
When the EBCM commands the TCS lamp off, the EBCM will ground the TCS 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 lamp for 3 seconds for a bulb check.
Whenever a malfunction is detected within the general brake system or DBC7, the EBCM turns
ON the TCS lamp, notifying the driver the brake system or DBC7 needs to be serviced.

Diagnostic Aids

Steps 1-7:

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