C1238

CIRCUIT DESCRIPTION
The EBTCM monitors vehicle speed deceleration, ABS/TCS/Stabilitrak activation, and brake switch ON times in order to calculate the brake rotor temperatures. As brake rotor usage reduces during driving, the EBTCM calculates the brake rotor cooling and the TCS re-enables.

The Electronic Brake and Traction Control Module (EBTCM) may continue the monitoring of the brake rotor temperature after you turn the ignition OFF. The EBTCM remains awake until the EBTCM calculates that the brake rotors cooled sufficiently. The cooling period may take up to 30 minutes.

CONDITIONS FOR SETTING THE DTC
This Diagnostic Trouble Code (DTC) sets when the estimated brake rotor temperature of either of the drive wheels exceeds 375°C (700°F). When the estimated brake rotor temperature of either of the drive wheels exceeds 375°C (700°F) during normal ABS conditions or normal braking conditions, the code does not set until the occurrence of the next Traction Control System (TCS) activation. When the estimated rotor temperatures of both drive wheels decreases below 275°C (530°F) prior to the next TCS activation, the code does not set and the TCS does not disable. When the estimated brake rotor temperatures of either drive wheel exceeds 375°C (530°F) during the TCS activation, the code immediately sets, but the TCS does not disable until the end of the TCS event.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ The TCS is disabled.
^ The DIC displays the TRACTION SUSPENDED message.
^ The ABS remains functional.

CONDITIONS FOR CLEARING THE DTC
^ The condition for DTC is no longer present and you used scan tool Clear DTCs function.
^ The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
^ The EBTCM does not detect the DTC in 50 drive cycles.

DIAGNOSTIC AIDS
^ The temperature is an estimate calculated by the EBTCM.
^ Possible causes of this DTC are the following conditions:
- The brake usage is excessive.
- The TCS usage is excessive.
- The stoplamp/BTSI switch is misaligned or damaged.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Reads TCS status