P0703

DTC P0703 STOP LAMP SWITCH CIRCUIT

Description
ON, OFF status of the stop lamp switch is sent via the CAN communication from the combination meter to TCM using the signal.

CONSULT-III Reference Value:

On Board Diagnosis Logic
- This is not an OBD-II self-diagnostic item.
- Diagnostic trouble code P0703 BRAKE SW/CIRC with CONSULT-III is detected when the stop lamp switch does not switch to ON and OFF.
- The stop lamp switch does not switch to ON and OFF.

Possible Cause
- Harness or connectors
(Stop lamp switch, and combination meter circuit are open or shorted.) (CAN communication line is open or shorted.)
- Stop lamp switch

DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.

After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
3. Start engine.
4. Start vehicle for at least 3 consecutive seconds.
5. If DTC is detected, go to CVT-65, "Diagnostic Procedure".

Diagnostic Procedure
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis check. Refer to CVT-54, "SELF-DIAGNOSTIC RESULT MODE". With Manufacturer's Scan Tool
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check CAN communication line. Refer to CVT-60, "DTC U1000 CAN COMMUNICATION LINE". Transmission Control System
NO >> GO TO 2.

2. CHECK STOP LAMP SWITCH CIRCUIT

With CONSULT-III
1. Turn ignition switch ON.
2. Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
3. Read out ON/OFF switching action of the BRAKE SW.





OK or NG
OK >> INSPECTION END
NG >> GO TO 3.

3. CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch harness connector E60 terminals 1 and 2.





Check stop lamp switch after adjusting brake pedal.
OK or NG
OK >> Check the following. If NG, repair or replace damaged parts.
^ Harness for short or open between battery and stop lamp switch.
^ Harness for short or open between stop lamp switch and combination meter.
NG >> Repair or replace the stop lamp switch.