P1805

P1805 BRAKE SWITCH

Description

Brake switch signal is applied to the ECM via the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is driven.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

1.Turn ignition switch ON.
2.Fully depress the brake pedal for at least 5 seconds.
3.Erase the DTC with CONSULT.
4.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK STOP LAMP SWITCH CIRCUIT

1.Turn ignition switch OFF.
2.Check the stop lamp when depressing and releasing the brake pedal.





Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 2.

2. CHECK STOP LAMP SWITCH POWER SUPPLY

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





Is the inspection result normal?
YES- GO TO 3.
NO- Perform the trouble diagnosis for power supply circuit.

3. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

1.Disconnect ECM harness connector.
2.Check the continuity between stop lamp switch harness connector and ECM harness connector.
Revision: March 20122013 Infiniti JX





3.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

4. CHECK STOP LAMP SWITCH

Check stop lamp switch. Refer to "Component Inspection (Stop Lamp Switch)" Engine Controls.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace stop lamp switch. Refer to "Exploded View" Exploded View.


Component Inspection (Stop Lamp Switch)


1. CHECK STOP LAMP SWITCH-I

1.Turn ignition switch OFF.
2.Disconnect stop lamp switch harness connector.
3.Check harness continuity between stop lamp switch terminals under the following conditions.





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

2. CHECK STOP LAMP SWITCH-II

1.Adjust stop lamp switch installation. Refer to "Adjustment" Adjustments.
2.Check harness continuity between stop lamp switch terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace stop lamp switch. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX