TRAC Switch Led Inoperative: Notes

Fig 1: TRAC Switch LED Inoperative Schematic

Courtesy of GENERAL MOTORS CORP.

When TCS is enabled, the TRAC LED request from the EBTCM to the BCM (circuit 832) is at battery voltage and the BCM grounds circuit 1660. This action turns the TRAC LED On, indicating that TCS is available.

When the driver disables TCS by depressing the TRAC switch, the EBTCM grounds circuit 832. In response, the BCM turns the LED Off by removing the ground on circuit 1660.