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
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 DIC: |
| - | Service ABS |
| - | Service Traction System |
| - | Service Active HNDLG (if equipped with Active Handling RPO JL4) |
Conditions for Clearing the DTC
| • | Condition for 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 Wiring Systems. |
| • | Possible causes for DTC C1237 to set: |
| • | Overcharging |
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||
Is the voltage within the range specified in the Value(s) column? | Less than 17 V | |||
Check actual battery voltage, using J 39200 DMM, while running engine at approximately 2000 RPM. Is the voltage within the range specified in the Value(s) column? | Less than 17 V | Refer to Charging System Check in Engine Electrical. | ||
4 | Carefully test drive vehicle above 8 km/h (5 mph). Does DTC C1237 reset as a current DTC? | -- | ||
5 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Is repair complete? | -- | -- |
