GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 DTC 🢒 DTC C1237 High System Supply Voltage

Object Number: 106504 Size: MF
ABS Components
Cell 44: PWR, GND, BPMV Pump Motor and Solenoids
Handling ESD Sensitive Parts Notice
Cell 10: Battery - Underhood Fuse(Junction) Block
Cell 10: IGN 3 Relay and HVAC, ABS 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/Stabilitrak® is disabled.
    • The ABS indicator is turned ON.
    • The TRACTION CONTROL indicator is turned ON.
    • The DIC displays the SERVICE STABILITY SYS message.

Conditions for Clearing the DTC
    • The condition for DTC is no longer present and you used scan tool Clear DTCs function.
    • The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
    • The EBTCM does not detect the DTC in 50 drive cycles.

Diagnostic Aids
    • If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
    • A possible cause of this condition is overcharging.

Test Description

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

  1. Checks to see what the EBTCM is reading as the voltage.

    2.

  2. Checks the actual battery voltage.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check

2

  1. Turn all accessories off.
  2. Turn OFF the ignition.
  3. Connect a scan tool to the data link connector (DLC).
  4. Start the engine.
  5. Run the engine at approximately 2000 RPM.
  6. Using the scan tool, select ABS/TCS/ICCS Switched System Battery Power from Data Display (1) Diagnostics, DATA LIST 2.
  7. Monitor the battery voltage.

Is the voltage less than the specified value?

17 V

Go to Step 5

Go to Step 3

3

  1. Run the engine at approximately 2000 RPM.
  2. Check the actual battery voltage using a J 39200 DMM.

Is the voltage less than the specified value?

17 V

Go to Step 4

Go to Charging System Check in Engine Electrical

4

Carefully test drive the vehicle above 8 km/h (5 mph).

Does DTC C1237 reset?

--

Go to Step 5

Go to Diagnostic System Check

5

Replace the EBTCM. Refer to Electronic Brake Control Module Replacement .

Is repair complete?

--

Go to Diagnostic System Check

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