DTC 94

DTC 94 Brake Switch Contacts Always Closed:

Circuit Description:
This DTC is run to determine the proper operation of the brake switch. This is important because ABS is activated when the brake switch is "ON" and turned "OFF" when the brake is "OFF." If the brake switch is always "ON," ABS operation will always be requested resulting in potential modulator cycling on rough roads. Additionally, this malfunction will most likely result in a dead battery (due to the brake lights staying "ON") if the driver is not informed of this malfunction.

DTC Will Set When:
DTC 94 can be set when the vehicle reaches at least 40 km/h (25 mph). If the brake was never "OFF" during two consecutive drive cycles, a malfunction exists.

Action Taken:
A malfunction DTC is stored. ABS is not disabled.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks if the malfunction is currently present.
2. Isolates the cause of the malfunction to either a malfunctioning or misadjusted brake switch, or a short to voltage in the brake switch circuitry.
3. Checks for unwanted voltage on the brake switch input circuit.
4. Checks for a possible intermittent malfunction.

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.