Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL Switch the ignition to ON. Measure the voltage between the PCM connector terminal 1AB (vehicle harness-side) and body ground when the brake pedal is depressed and released. Voltage Brake pedal depressed: B+ Brake pedal released: 1 V or less Is the voltage normal?	Yes	Go to Step 5.
1		No	If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 3.
2	INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT Disconnect the brake switch connector. Measure voltage between the brake switch connector terminal D (vehicle harness-side) and body ground. Is the voltage 1 V or less ?	Yes	Go to Step 4.
2		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
3	INSPECT BRAKE SWITCH SIGNAL FOR OPEN CIRCUIT Disconnect the PCM connectors. Disconnect the brake switch connector. Inspect continuity between the PCM connector terminal 1AB (vehicle harness-side) and brake switch terminal D (vehicle harness-side). Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
4	INSPECT BRAKE SWITCH Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) Is the brake switch normal?	Yes	Go to the next step.
4		No	Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
5	VERIFY THAT THE SAME DTC IS NOT PRESENT Reconnect all disconnected connectors. Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Start the engine and drive the vehicle at 20 km/h {12 mph} or more . Are the same DTCs present?	Yes	Repeat the inspection from Step 1.
5		No	Go to the next step.
6	VERIFY THAT NO OTHER DTCS ARE PRESENT Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
6		No	DTC troubleshooting completed.