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 A11 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.