Circuit Description
DTC C1237 detects high vehicle voltage levels prior to any required motor movement (initialization or ABS/ETS). If excessive voltage exists, demagnetization of the motor magnets may occur. Demagnetization of the motor magnets would eventually affect or eliminate ABS/ETS performance.
Conditions for Setting the DTC
DTC C1237 can set only if the vehicle's speed is greater than 5 km/h (3 mph).
A malfunction exists if the switched battery voltage is greater than 17.1 volts.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS/ETS disables. |
| • | The amber ABS/ETS warning indicators turn on. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | 100 drive cycles pass with no DTCs detected. |
Diagnostic Aids
Many conditions may cause an intermittent malfunction. Proper use of the scan tool enhanced diagnostic function can be used in order to measure the frequency of the fault. Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||
2 |
Is the voltage less than or equal to the specified voltage? | 16 V | ||
3 |
Is the voltage less than or equal to the specified range? | 16 V | Go to Charging System Check | |
4 |
Does DTC C1237 set as a current DTC? | -- | ||
5 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the repair complete? | -- | -- | |
6 | Is the malfunction intermittent or is not present at this time? | -- | Go to Diagnostic Aids | -- |
