P0703

DTC P0703 STOP LAMP SWITCH CIRCUIT

Description
ON, OFF status of the stop lamp switch is sent via the CAN communication from the unified meter and A/C amp to TCM using the signal.

CONSULT-III Reference Value in Data Monitor Mode:

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, OFF.

Possible Cause
- Harness or connectors
(Stop lamp switch, and unified meter and A/C amp 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 "Diagnostic Procedure" below.

Diagnostic Procedure

1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis check. Refer to CVT-44, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Is any malfunction of the "U1000 CAN COMM CIRCUIT" indicated?
YES >> Check CAN communication line. Refer to CVT-53. U1000
NO >> GO TO 2.

2. CHECK STOP LAMP SWITCH CIRCUIT

With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
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 E38 terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal - refer to BR-5. Stop Lamp Switch System Inspection
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 unified meter and A/C amp.
NG >> Repair or replace the stop lamp switch.