P0703

P0703 BRAKE SWITCH B





Description
BCM detects ON/OFF state of the stop lamp switch and transmits the data to the CVT control unit via CAN communication by converting the data to a signal.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

CAUTION:
Always drive vehicle at a safe speed.
1.PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.
- GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select "Data Monitor" in "TRANSMISSION".
3. Select "VEHICLE SPEED".
4. Drive the vehicle.
5. Maintain the following condition for 10 seconds or more.





6. Stop the vehicle.
7. Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P0703" detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch connector.
3. Check voltage between stop lamp switch harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 6.
2.CHECK CIRCUIT BETWEEN STOP LAMP SWITCH AND BCM (PART 1)
1. Disconnect BCM connector.
2. Check continuity between stop lamp switch harness connector terminal and BCM harness connector terminal.











Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace damaged parts.
3.CHECK CIRCUIT BETWEEN STOP LAMP SWITCH AND BCM (PART 2)
Check continuity between stop lamp switch harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged parts.
4.CHECK INSTALLATION POSITION OF STOP LAMP SWITCH
Check stop lamp switch mounting position. Inspection and Adjustment.
Is the inspection result normal?
YES - GO TO 5.
NO - Adjust stop lamp switch mounting position.
5.CHECK STOP LAMP SWITCH
Check stop lamp switch. SEE Component Inspection (Stop Lamp Switch).
Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or replace stop lamp switch.
6.DETECT MALFUNCTIONING ITEM
Check the following items:
- Open or short circuit of the harness between battery and stop lamp switch connector. Battery Power Supply.
- Battery
- 10A fuse [No.38, located in fuse block (J/B)]. Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or replace stop lamp switch.




Component Inspection (Stop Lamp Switch)
1.CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch connector terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the stop lamp switch. Exploded View.