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Nissan Sentra Service Manual: P1805 Brake switch

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P1805 Brake switch

DTC Logic

DTC DETECTION LOGIC

DTC No.

 CONSULT screen terms (Trouble diagnosis content)

 DTC detecting condition

 Possible cause
P1805

 BRAKE SW/CIRCUIT (Brake switch circuit) Stop lamp signal is not sent to ECM for extremely long time while the vehicle is driving.
  • Harness or connectors (Stop lamp switch circuit is open or shorted.)
  • Stop lamp switch

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

NOTE:

Since this DTC is difficult to be confirmed, check component function to judge the normality.

>> Proceed to EC-410, "Component Function Check".

Component Function Check

1.CHECK BRAKE SWITCH FUNCTION

With CONSULT


  1. On the CONSULT screen, select “ENGINE” >> “DATA MONITOR” >> “BRAKE SW 2”.
  2. Check “STOP LAMP SW” indication under the following conditions.

Without CONSULT


Without CONSULT


  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Proceed to EC-410, "Diagnosis Procedure".

Diagnosis Procedure

1.CHECK STOP LAMP SWITCH OPERATION

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

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 5.

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.


  1. Also check harness for short to ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

  1. Pull out #30 fuse.
  2. Check that the fuse is not fusing.
  3. Check the continuity between stop lamp switch harness connector and fuse terminal.


  1. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> Check power supply circuit for 12V battery power supply.

NO >> Repair or replace error-detected parts.

4.CHECK STOP LAMP SWITCH

Check stop lamp switch. Refer to EC-412, "Component Inspection (Stop Lamp Switch)".

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace stop lamp switch. Refer to BR-22, "Exploded View".

5.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

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


  1. Also check harness for short to ground.

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Repair or replace error-detected parts.

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 the continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?


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 BR-15, "Adjustment".
  2. Check the continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace stop lamp switch. Refer to BR-22, "Exploded View".

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