DTC 94

DTC 94 Brake Switch Contacts Always Closed:

Brake Switch Contacts:

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 lamps staying "ON") if the driver is not informed of this malfunction.

FAILURE CONDITION
DTC A094 can be set if the vehicle speed 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; however, the ABS indicator will flash to indicate a malfunction exists.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks to see if brake lamps are "ON."
2. This step isolates the cause of the malfunction to either a faulty or misadjusted brake switch, or a short to voltage in the brake switch circuitry.
3. This step checks for a resistive short to voltage in the brake switch circuitry.
4. This step ensures malfunction was not due to a poor connection.

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.