P0703

P0703 BRAKE SWITCH B

DTC Logic


DTC DETECTION LOGIC






NOTE:
DC stands for "DRIVING CYCLE" and indicates a series of driving cycle of "Ignition switch OFF -> ON -> driving -> OFF".

DTC CONFIRMATION PROCEDURE


CAUTION:
Always drive vehicle at a safe speed.

1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. CHECK DTC DETECTION

With CONSULT
1.Start the engine.
2.Drive the vehicle.
3.Maintain the following conditions for 10 seconds or more.





4.Depress the brake pedal.
5.Stop the vehicle.
6.Turn ignition switch OFF.
7.Repeat step 1 to 6.
8.Turn ignition switch ON.
9.Check DTC.
Is "P0703" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Electrical Diagrams.

1. CHECK BCM INPUT SIGNAL

1.Turn ignition switch OFF.
2.Disconnect BCM connector.
3.Check voltage between BCM harness connector terminal and ground.
Revision: March 20122013 Infiniti JX





Is the inspection result normal?
YES- GO TO 8.
NO- GO TO 2.

2. CHECK POWER CIRCUIT

1.Disconnect stop lamp switch connector.
2.Check voltage between stop lamp switch harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 6.

3. CHECK CIRCUIT BETWEEN STOP LAMP SWITCH AND BCM

1.Check continuity between stop lamp switch harness connector terminal and BCM harness connector terminal.





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 STOP LAMP SWITCH MOUNTING POSITION

Check stop lamp switch mounting position. Refer to "Adjustment" Adjustments.
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. Refer to "Component Inspection (Stop Lamp Switch)" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace stop lamp switch.

6. CHECK CIRCUIT BETWEEN STOP LAMP SWITCH AND FUSE BLOCK (J/B)

1.Turn ignition switch OFF.
Revision: March 20122013 Infiniti JX
2.Disconnect fuse block (J/B) connector.
3.Check continuity between fuse block (J/B) harness connector terminal and stop lamp switch harness connector terminal.





4.Check continuity between fuse block (J/B) harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace damaged parts.

7. DETECT MALFUNCTIONING ITEM

Check the following item:
- Harness for short or open between battery and fuse block (J/B).
- 10A fuse [#10, located in fuse block (J/B)]
- Fuse block (J/B)
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Repair or replace damaged parts.

8. CHECK BCM

With CONSULT
1.Connect all of disconnected connectors.
2.Turn ignition switch ON.
3.Select "Data Monitor" in "BCM".
4.Select "BRAKE SW 1".
5.Check that "BRAKE SW 1" turns ON/OFF when brake pedal is depressed/released. Refer to "Reference Value" Pinout Values and Diagnostic Parameters.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace BCM.


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. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX