C1090 ABS Brake Lamp Control Circuit Low

C1090 ABS Brake Lamp Control Circuit Low - The Electronic Stability Control (ESC) may also be reffered to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

C1090 ABS Brake Lamp Control Circuit Low

Set condition code C1090 ABS Brake Lamp Control Circuit Low

When monitoring the brake lamp activation relay control circuit the module detects a short to ground.

Possible causes C1090 ABS Brake Lamp Control Circuit Low

  • Brake lamp activity relay control open or shorted to ground.
  • Blown fuse.
  • Brake lamp activition relay.
  • Antilock Brake System (ABS) Module.


How to fix diagnose code C1090 ABS Brake Lamp Control Circuit Low?


Step 1. Check for DTC C1090 ABS Brake lamp control circuit low

This DTC must be active for the results of this test to be valid.
Turn the ignition on, with the scan tool record and erase DTCs. Start the engine, apply brake pedal firmly with at least 80 bar (1160 psi). With the scan tool, read DTCs.

Does the scan tool display code C1090?

YES, go to step 2
NO, perform the ABS Intermitten.

Step 2. Check connector/terminal for damage

Check all terminals for broken, bent, pushed out, or corroded terminals.
Turn the ignition off, inspect the ABS Module harness connector and the brake lamp activation relay harness connector.

Is the ABS Module or any of the connectors/terminals damaged?

YES, repair as necessary.
NO, go to step 3.

Step 3. Check brake lamp activation relay control shorted to ground

Turn the ignition off, disconnect the ABS Module harness connector. Start the engine, using a 12volt test light connected to ground, probe the brake lamp activation relay control circuit at the ABS Module harness connector.

Does the test light illuminate brightly?

YES, replace the Antilock Brake System (ABS) Module. Perform the ABS verification Test procedure.
NO, go to step 4.

Step 4. Check fused run/start relay output
Step 5. Brake lamp activation relay

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