C1237

CIRCUIT DESCRIPTION
The EBCM/EBTCM is required to operate within a specified range of voltage to function properly. The EBCM/EBTCM monitors for high voltage conditions which could damage the EBCM/EBTCM. 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
DTC C1237 can only be set if the vehicle's speed is greater than 8 km/in (5 mph). If the battery voltage is greater than 17 volts, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ ABS/TCS is disabled.
^ ABS/TCS Indicators are turned on.

CONDITIONS FOR CLEARING THE DTC
^ Condition for DTC is no longer present and scan tool clear DTC function is used.
^ 100 ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.
^ Check for other high voltage conditions.
^ Test the charging system for overcharging conditions.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. Checks to see what the EBCM/EBTCM is reading as the voltage.
3. Checks the actual battery voltage.