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
1.Start engine.
2.Drive vehicle for at least 3 consecutive seconds.
3.Perform "Self Diagnostic Results" in "TRANSMISSION".
Is "P0703" detected?
YES- Go to Diagnosis Procedure (see below).
NO- Check intermittent incident. Intermittent Incident.


Diagnosis Procedure


1. CHECK STOP LAMP RELAY SIGNAL

1.Turn ignition switch OFF.
2.Check and adjust the installation position of stop lamp switch. Adjustments.
3.Disconnect the BCM connector.
4.Check the voltage between BCM vehicle side harness connector terminal and ground.





Is the inspection result normal?
YES- Check the BCM. Pinout Values and Diagnostic Parameters.
NO- GO TO 2.

2. CHECK HARNESS BETWEEN STOP LAMP RELAY AND BCM

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





3.Check the continuity between BCM vehicle side harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace damaged parts.

3. CHECK STOP LAMP SWITCH SIGNAL

Check the voltage between stop lamp relay vehicle side harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 4.

4. CHECK STOP LAMP SWITCH

Check the stop lamp switch. .
Is the inspection result normal?
YES- GO TO 5.
NO- Replace the stop lamp switch. Exploded View.

5. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND STOP LAMP RELAY

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





3.Check the continuity between stop lamp switch vehicle side harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace damaged parts.

6. DETECT MALFUNCTIONING ITEMS

Check the following.
- Harness for short or open between stop lamp switch and battery
- 10A fuse (#11)
- Battery
Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Repair or replace damaged parts.

7. CHECK STOP LAMP RELAY

Check the stop lamp relay. .
Is the inspection result normal?
YES- GO TO 8.
NO- Replace the stop lamp relay.

8. DETECT MALFUNCTIONING ITEMS

Check the following.
- Harness for short or open between stop lamp relay and battery
- Harness for short or open between stop lamp relay and ground
Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Repair or replace damaged parts.


Component Inspection (Stop Lamp Switch)


1. CHECK STOP LAMP SWITCH

Check the continuity between stop lamp switch connector terminals.





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


Component Inspection (Stop Lamp Relay)


1. CHECK STOP LAMP RELAY

1.Disconnect the stop lamp relay.
2.Apply 12 V direct current between stop lamp relay terminals 1 and 2.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
3.Check the continuity between stop lamp relay terminals 3 and 5.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace the stop lamp relay.