A094

Fig. 16 Code 94: Brake Switch Contacts Always Closed:

DTC A094 Brake Switch Contacts Always Closed:

Circuit Description:
This DTC is run to determine the proper operation of the stoplamp switch. This is important because ABS is activated when the stoplamp switch is closed and deactivated when the switch is open. If the stoplamp switch is always closed, ABS operation will always be requested, resulting in potential hydraulic modulator cycling on rough roads. Additionally, this malfunction will most likely result in a discharged battery (due to the stoplamps remaining illuminated) if the driver is not informed of this malfunction.

Failure Condition:
DTC A094 can be set when the vehicle reaches at least 40 km/h (25 mph). If the stoplamp switch was never open during two consecutive drive cycles, a malfunction exists.

Action Taken:
A DTC A094 is stored. ABS is not disabled and the "ABS" indicator will not be illuminated.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This checks if the malfunction is currently present.
2. This step isolates the cause of the malfunction to either a malfunctioning or misadjusted stoplamp switch or a short to voltage in the stoplamp switch circuitry.
3. This step checks for unwanted voltage on the stoplamp switch input circuit.
4. This step 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.