DTC 95

DTC 95 Brake Lamp Switch Circuit Open:

CIRCUIT DESCRIPTION
This DTC is used to identify open brake switch circuitry that prevents the brake switch input to the EBTCM from changing states when the brake is applied.

This DTC is used in conjunction with DTC 91 to determine the cause of an open brake switch malfunction.

DTC WILL SET WHEN
DTC 95 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, TCS is disabled and the "TRACTION OFF" indicator lamp is turned "ON." ABS remains functional.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Confirms that an open in the brake switch circuitry currently exists.
2. Indicates if the brake switch signal is being received by the EBTCM.
3. The J 39700 Pinout Box with the J 39700-25 adapter cable must be connected before this step is performed. This step isolates the open circuit to either the brake switch input circuitry, or the EBTCM.
4. Ensures malfunction was not due to poor terminal contact.

DIAGNOSTIC AIDS
Possible causes:
^ Brake switch input circuit open.
^ All brake lamps open.
^ Open brake lamp ground.

An "intermittent" malfunction is most likely 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 of 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.