P0703

P0703 BRAKE SWITCH B





Description
BCM detects ON/OFF state of the stop lamp switch and transmits the data to the TCM 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.

NOTE:
Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON.
2. Start engine.
3. Drive vehicle for at least 3 consecutive seconds.
4. Perform "Self Diagnostic Results" in "TRANSMISSION".
Is "P0703" detected?
YES - Go to P0703.
NO - Check intermittent incident. Intermittent Incident.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
1.CHECK STOP LAMP SWITCH CIRCUIT
1. Check and adjust the installation position of stop lamp switch. Inspection And Adjustment.





2. Disconnect BCM connector.
3. Check voltage between BCM vehicle side harness connector terminal and ground.






Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 2.
2.CHECK HARNESS BETWEEN STOP LAMP SWITCH AND BCM (PART 1)





1. Disconnect stop lamp switch connector.
2. Check continuity between stop lamp switch vehicle side harness connector terminal and BCM vehicle side harness connector terminal.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace damaged parts.
3.CHECK HARNESS BETWEEN STOP LAMP SWITCH AND BCM (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
Check stop lamp switch. P0703.
Is the inspection result normal?
YES - Check the following.
- Harness for short or open between battery and stop lamp switch
- 10A fuse [No. 7, located in fuse block (J/B)]
NO - Repair or replace stop lamp switch.
5.CHECK BCM
With CONSULT-III
1. Turn ignition switch OFF.
2. Connect BCM connector.
3. Turn ignition switch ON.
4. Select "BRAKE SW 1" in "Data Monitor" in "BCM" and verify the proper operation of ON/OFF. Reference Value.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace BCM. Body Control System.
6.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - Replace TCM. Exploded View.
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.