DTC 95

DTC 95 Brake Switch Circuit Open:

Circuit Description:
This DTC is used to identify open brake switch circuitry that prevents the brake switch input to the EBCM from changing states when the brake is applied. This DTC is used in conjunction with DTCs AO91 and AO92 to determine the cause of an open brake switch malfunction.

Failure Condition:
DTC AO95 can be set after initialization is completed. If the brake switch input voltage is out of specification for one second indicating an open circuit, a malfunction exists.

Action Taken:
A malfunction DTC is stored, ABS is disabled and the ABS indicator lamp is turned "ON."

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step is used to confirm that an open in the brake switch circuitry currently exists.
2. This step indicates if the brake switch signal is being received by the EBCM.
3. This step indicates if an open circuit exists in the brake switch or brake lamp circuitry.
4. This step isolates the open circuit to either the brake switch input circuitry, or the EBCM.

Diagnostic Aids:
An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.