DTC A091 - Open Brake Switch During Deceleration: Notes

EBCM can detect an open stoplight switch in the non-ABS mode. The EBCM looks for deceleration rates that would indicate braking action and verifies this assumption by requiring several repeats of this detection method. In each case, ABS would not be available since no stoplight switch input is seen.

1. Indicates if stoplight switch signal is being received by the EBCM.
2. Indicates if an open circuit exists in the stoplight switch or the rear combination light circuitry.
3. Isolates the open circuit to either the stoplight switch input circuitry or the EBCM.
4. Verifies that voltage is available to the stoplight switch.
5. Verifies that the stoplight switch is functioning properly.