For 1990-2009 cars
ABS Components
Cell 44: PWR, GND, and Stoplamp/BTSI Switch
Handling ESD Sensitive Parts Notice
Cell 10: Battery and Underhood Fuse Blocks
Cell 10: MISC LGT, COOL FNS, C/LTR/RDO/CLSTR/MISC, IGN SW, RR DEFOG/PWRSEAT, ABS SOL, and ABS MOT Fuses
Cell 10: ABS/CCR and CLG FAN/TCC Fuses

### Circuit Description

The circuit detects high vehicle voltage levels to the solenoid relay. High voltage may cause damage to the system.

### Conditions for Setting the DTC

All of the following conditions occur:

• | The vehicle speed is greater than 8 km/h (5 mph).

• | The battery positive voltage (B+) is greater than 17 volts.

### Action Taken When the DTC Sets

• | A malfunction DTC is stored.

• | The ABS/TCS is disabled.

• | The ABS indicator isturned ON.

• | The TRACTION OFF indicator is turned ON.

### 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

• | Inspect the battery for overcharging.

• | 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.

• | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.

• | If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step checks to see what the EBCM/EBTCM is reading as the voltage.

2. This step checks the actual battery voltage.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Turn all accessories off.
2. Start the engine.
3. Use the scan tool in order to select the ABS/TCS Data List
4. Monitor the battery voltage while running the engine at about 2000 rpm.

Is the voltage below the specified value?

17.0 V

Go to Step 5

Go to Step 3

3 | Use the J 39200 DMM in order to inspect the actual battery voltage while running the engine at about 2000 rpm. Is the voltage below the specified value? | 17.0 V | Go to Step 4 | Go to Charging System Check in Engine Electrical
4 | Test drive the vehicle above 8 km/h (5 mph). Does DTC C1237 reset? | -- | Go to Step 5 | Go to Diagnostic System Check - ABS
5 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check - ABS | --