P1805

P1805 BRAKE SWITCH

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.
4.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect stop lamp switch harness connector.
3.Check the voltage between stop lamp switch harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- Perform the trouble diagnosis for power supply circuit.

2. CHECK STOP LAMP SWITCH GROUND CIRCUIT

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





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

3. CHECK STOP LAMP SWITCH

Check the stop lamp switch. Refer to "Component Inspection (Stop Lamp Switch)" P1572.
Is the inspection result normal?
YES- GO TO 4.
NO- Replace stop lamp switch. Refer to "Exploded View" Exploded View.

4. CHECK STOP LAMP RELAY CONTROL CIRCUIT

1.Check the continuity between stop lamp relay harness connector and ground.





2.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK STOP LAMP SWITCH SIGNAL POWER SUPPLY

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





Is the inspection result normal?
YES- GO TO 6.
NO- Perform the trouble diagnosis for power supply circuit.

6. CHECK STOP LAMP SWITCH SIGNAL CIRCUIT

1.Disconnect ECM harness connector.
2.Check the continuity between stop lamp relay harness connector and ECM harness connector.





*1: Except for California
*2: For California
3.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace error-detected parts

7. CHECK STOP LAMP RELAY

Check the stop lamp relay. Refer to "Component Inspection (Stop Lamp Relay)" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace stop lamp relay.


Component Inspection (Stop Lamp Switch)


1. CHECK STOP LAMP SWITCH-1

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





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

2. CHECK STOP LAMP SWITCH-2

1.Adjust stop lamp switch installation. Refer to "Inspection and Adjustment" Adjustments.
2.Check the continuity between stop lamp switch terminals as per the following conditions.





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


Component Inspection (Stop Lamp Relay)


1. CHECK STOP LAMP RELAY

1.Turn ignition switch OFF.
2.Remove stop lamp relay.





3.Check the continuity between stop lamp relay terminals as per the following conditions.





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