C1238

CIRCUIT DESCRIPTION
The EBCM/EBTCM monitors the following occurrences in order to calculate the brake rotor temperatures:
^ The vehicle speed deceleration
^ The ABS/TCS activation
^ The brake lamp ON times

CONDITIONS FOR SETTING THE DTC
This DTC sets when either driven wheel estimated brake rotor temperature exceeds 375°C (700°F). If either driven wheel estimated brake rotor temperature has exceeded 375°C (700°F) during ABS or normal braking conditions, the code will not be set until the next TCS activation occurs.
If both rotor estimated temperatures have cooled below 275°C (530°F) before the next TCS activation, the following conditions will be present:
^ The code will not be set.
^ The TCS will not be disabled.

If either driven wheel brake rotor temperatures has exceeded 375°C (700°F) during TCS, then the code will be set immediately. The TCS will not be disabled until the end of the TCS event.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ The TCS is disabled.
^ The TRACTION CONTROL indicator is turned ON.
^ The ABS remains functional.

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

DIAGNOSTIC AIDS
^ The temperatures are estimated figures taken by the EBCM/EBTCM.
^ The following conditions are other possible causes of this malfunction:
- Excessive brake usage
- Excessive TCS usage
- A misadjusted or damaged stoplamp/BTSI switch

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