P0703

P0703 BRAKE SWITCH B





Description
- Stop lamp switch is installed to upper part of brake pedal.
- Stop lamp switch detects that brake pedal is depressed.
- Stop lamp switch transmits a signal of brake pedal depression to BCM.
- TCM receives stop lamp switch signal (CAN signal) from BCM.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

CAUTION:
Always drive vehicle at a safe speed.
1.PRECONDITIONING
Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
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 conditions for 10 seconds or more.

VEHICLE SPEED : More than 30 km/h (19 MPH)

6. Depress brake pedal and stop the vehicle.
7. Turn ignition switch OFF.
8. Repeat the above steps 4 to 7 two times.
9. Turn ignition switch ON.
10. Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P0703" detected?
YES - Go to P0703.
NO - INSPECTION END




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





Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 7.
2.CHECK HARNESS BETWEEN BCM AND STOP LAMP SWITCH (PART 1)
1. Disconnect BCM connector.
2. Check continuity between BCM vehicle side harness connector terminal and stop lamp switch vehicle side harness connector terminal.










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










Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged parts.
4.CHECK STOP LAMP SWITCH (PART 1)
Check stop lamp switch. P0703.
Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 5.
5.PERFORM STOP LAMP SWITCH INSTALLATION POSITION ADJUSTMENT
Perform stop lamp switch installation position adjustment. Adjustments.
- GO TO 6.
6.CHECK STOP LAMP SWITCH (PART 2)
Check stop lamp switch. P0703.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace stop lamp switch. Exploded View.
7.DETECT MALFUNCTIONING ITEMS
Check the following.
- 10A fuse (No.7)
- Harness for short or open between battery and stop lamp switch ( Battery Power Supply.)
- Battery
Is the inspection result normal?
YES - GO TO 8.
NO - Repair or replace damaged parts.
8.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace BCM. Exploded View (With intelligent key system), Exploded View (Without intelligent key system).
NO - Repair or replace damaged parts.




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 stop lamp switch. Exploded View.