DTC A092: Open Stoplamp Switch When ABS Was Required

OPEN STOPLAMP 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, the ABS will never be activated. Since this malfunction is difficult to detect under normal braking conditions, this malfunction is detected only when ABS if required.

Cause(s)
- The stoplamp switch is malfunctioning.
- The stoplamp switch fuse is blown.
- The stoplamp switch fuse power feed circuit is open.
- Two wheel speed sensors have been lost at the same time.
- The electronic brake control module (EBCM) is malfunctioning.

Fail Action
DTC A092 can be set if the vehicle's speed is greater than 8 km/h (5 mph). 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
The number(s) below refer to step(s) on the diagnostic table.
2. This indicates if the EBCM has received the stoplamp switch signal.
3. This step indicates the existence of an open circuit in the stoplamp switch or the rear combination light circuitry.
4. This step isolates the open circuit to either the stoplamp switch input circuitry or the EBCM.
11. This step verifies that voltage is available at the stoplamp switch.
15. This step verifies that the stoplamp switch is functioning properly.

Diagnostic Aids
An intermittent malfunction may be caused by a poor connection, wire insulation that has been rubbed through, or a wire that is broken inside the insulation.
Check the frequency of the malfunction by using the enhanced diagnostic feature of the scan tool as described in "Scan Tool Diagnostics." Scan Tool Diagnostics
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-wire ring connections, or physical damage to the wiring harness.








DTC A092 - Open Stoplamp Switch When ABS Was Required