A092

Fig. 514 Code 92: Open Brake Switch When ABS Required:

DTC A092 Open Brake Switch When ABS Was Required:

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. If the stoplamp switch is open, ABS will never be activated. Since this malfunction is difficult to detect under normal braking conditions, this malfunction is only detected when ABS is required.

Failure Condition:
DTC A092 can be set if the vehicle's speed is greater than 8km/h (5mph). If the stoplamp switch was not closed and a release was required on two channels for 0.5 seconds, a malfunction exists.

Action Taken:
A DTC A092 is stored, ABS is disabled and the "ABS" indicator is turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step indicates if the stoplamp switch signal is being received by the EBCM.
2. This step indicates if an open circuit exists in the stoplamp switch or the rear combination lamp circuitry.
3. This step isolates the open circuit to either the stoplamp switch input circuitry or the EBCM.
4. This step verifies that voltage is available at the stoplamp switch.
5. This step verifies that the stoplamp switch is functioning properly.

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.