C1237

CIRCUIT DESCRIPTION
This circuit is designed to detect high vehicle voltage levels to the solenoid relay. High voltage may cause damage to the system.

CONDITIONS FOR SETTING THE DTC
Diagnostic Trouble Code (DTC) C1237 can only be set if the vehicle's speed is greater than 8 km/h (5 mph). If the battery voltage is greater than 17 volts, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
ABS/TCS/Active Handling (if equipped with RPO JL4) are disabled.
^ Indicators that turn on:
- ABS indicator
- Car Icon (TCS indicator)
^ Messages displayed on the Driver Information Center (DIC):
- Service ABS
- Service Traction System
- Service Active HNDLG (if equipped with Active Handling RPO JL4)

CONDITIONS FOR CLEARING THE DTC
^ Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
^ Fifty ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
^ If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Diagnostic Aids.
^ Possible causes for Diagnostic Trouble Code (DTC) C1237 to set:
^ Overcharging

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. Checks to see what the Electronic Brake and Traction Control Module (EBTCM) is reading as the voltage.
3. Checks the actual battery voltage.





DTC C1237 HIGH SYSTEM SUPPLY VOLTAGE