C0081

DTC C0081 Stoplamp Switch Always Closed Or Shorted:

ABS Stoplamp Switch Schematic:

CIRCUIT DESCRIPTION
The stoplamp switch is a normally closed switch. With the ignition in the RUN position and the brake pedal not depressed ignition voltage will be present at the Electronic Brake Control Module (EBCM). When the brakes are applied, the ignition voltage present at the EBCM will be zero.

CONDITIONS FOR SETTING DTC(S)
^ Vehicle above 35 mph for 10 seconds followed by vehicle at rest for 1 second
^ Stoplamp switch never switching during the above condition

ACTION TAKEN WHEN THE DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: This Diagnostic Trouble Codes (DTC) is a Ignition Latched DTC which indicates the above is true until the ignition is fumed to OFF (even if the cause of the DTC is intermittent).

DIAGNOSTIC AIDS
A faulty stoplamp switch or circuit condition in circuit 420 can cause this DTC.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic chart.
2. Check stoplamp switch status using the scan tool.
3. Check for a short to battery or misadjusted stoplamp switch.
5. Check for an open in circuit 420 or faulty stoplamp switch.