Nissan Sentra manuals

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".

P1800 Intake manifold tuning valve
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P1800 VIAS S/V-1 (Variable intake air ...

P2004 Intake manifold runner control valve
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P2004 TUMBLE CONT/V (Intake manifold r ...

Other materials:

Battery terminal with fusible link
Exploded view Battery terminal with fusible link Harness connector Removal and installation Removal Loosen the battery terminal nuts and disconnect both battery negative and positive terminals. Refer to pg-50, "exploded view". Caution: To prevent damage to the parts, di ...

Exterior front
Engine hood Windshield wiper and washer switch, Windshield Moonroof (if so equipped) Power windows Door locks, keyfob, keys, NISSAN Intelligent Key® (if so equipped) Mirrors Tire pressure Flat tire Tire chains Replacing bulbs Headlight and turn signal switch, LED he ...

P1225 TP Sensor
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P1225 CTP LEARNING-B1 (Closed throttle position learning bank 1) Closed throttle position learning value is excessively low. E ...

© 2014-2026 Copyright www.nisentra.com