Infiniti M35/M45 Y50. Manual - part 709

DTC P1805 BRAKE SWITCH

EC-1309

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Wiring Diagram

NBS005NQ

TBWT1054E

EC-1310

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DTC P1805 BRAKE SWITCH

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS005NR

ICC MODELS

1. 

CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

Refer to 

ACS-40, "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2. 

CHECK STOP LAMP SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the stop lamp when depressing and releasing the brake pedal.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

101

V/R

Stop lamp switch

[Ignition switch: OFF]

●

Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]

●

Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

Brake pedal

Stop lamp

Fully released

Not illuminated

Slightly depressed

Illuminated

DTC P1805 BRAKE SWITCH

EC-1311

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3. 

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Disconnect stop lamp switch (1) harness connector.

–

ICC brake switch (2)

2.

Disconnect ICC brake hold relay (1) harness connector.

–

: Vehicle front

3.

Check voltage between stop lamp switch terminal 1 and ground
with CONSULT -II or tester.

4.

Check voltage between ICC brake hold relay terminal 3 and
ground with CONSULT -II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

PBIB2705E

PBIB2699E

Voltage: Battery voltage

PBIA9488J

Voltage: Battery voltage

PBIB2740E

EC-1312

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DTC P1805 BRAKE SWITCH

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E101

●

10A fuse

●

Harness for open or short between battery and stop lamp switch

●

Harness for open or short between battery and ICC brake hold relay

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between the following;
ECM terminal 101 and stop lamp switch terminal 2, 
ECM terminal 101 and ICC brake hold relay terminal 5.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and stop lamp switch

●

Harness for open or short between ECM and ICC brake hold relay

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK STOP LAMP SWITCH 

Refer to 

EC-1315, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace stop lamp switch.

8. 

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-1315, "Component Inspection"

 .

OK

>> GO TO 9.

NG

>> Replace ICC brake hold relay.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.