Infiniti M35/M45 Y50. Manual - part 530

DTC P1805 BRAKE SWITCH

EC-593

[VQ35DE]

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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-594

[VQ35DE]

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-597, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace stop lamp switch.

8. 

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-575, "Component Inspection"

 .

OK

>> GO TO 9.

NG

>> Replace ICC brake hold relay.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

DTC P1805 BRAKE SWITCH

EC-595

[VQ35DE]

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ASCD MODELS

1. 

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 4.

NG

>> GO TO 2.

2. 

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Disconnect stop lamp switch (1) harness connector.

–

ASCD brake switch (2)

2.

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

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E101

●

10A fuse

●

Harness for open or short between stop lamp switch and battery

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

Brake pedal

Stop lamp

Fully released

Not illuminated

Slightly depressed

Illuminated

PBIB2705E

Voltage: Battery voltage

PBIA9488J

EC-596

[VQ35DE]

DTC P1805 BRAKE SWITCH

4. 

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and stop lamp switch

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

6. 

CHECK STOP LAMP SWITCH 

Refer to 

EC-597, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace stop lamp switch.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.