Infiniti M35/M45 Y50. Manual - part 703

DTC P1572 ICC BRAKE SWITCH

EC-1285

[VK45DE]

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4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E102

●

10A fuse

●

Harness for open or short between ICC brake switch and fuse

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

5. 

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ICC brake switch terminal 2 and ECM terminal 108.
Refer Wiring Diagram.

4.

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 ICC brake switch and ECM

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

7. 

CHECK ICC BRAKE SWITCH

Refer to 

EC-1288, "Component Inspection"

 .

OK or NG

OK

>> GO TO 15.

NG

>> Replace ICC brake switch.

8. 

CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

Refer to 

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

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace.

Continuity should exist.

EC-1286

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DTC P1572 ICC BRAKE SWITCH

9. 

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch (1) harness connector.

–

ICC brake switch (2)

3.

Disconnect ICC brake hold relay (1) harness connector.

–

: Vehicle front

4.

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

5.

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

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

PBIB2705E

PBIB2699E

Voltage: Battery voltage

PBIA9488J

Voltage: Battery voltage

PBIB2740E

DTC P1572 ICC BRAKE SWITCH

EC-1287

[VK45DE]

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D

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G

H

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M

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EC

10. 

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.

11. 

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 13.

NG

>> GO TO 12.

12. 

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.

13. 

CHECK STOP LAMP SWITCH

Refer to 

EC-1288, "Component Inspection"

 .

OK or NG

OK

>> GO TO 14.

NG

>> Replace stop lamp switch.

14. 

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-1288, "Component Inspection"

 .

OK

>> GO TO 15.

NG

>> Replace ICC brake hold relay.

15. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

EC-1288

[VK45DE]

DTC P1572 ICC BRAKE SWITCH

Component Inspection

NBS005MU

ICC BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Check continuity between ICC brake switch terminals 1 and 2
under the following conditions.

4.

If NG, adjust ICC brake switch installation, refer to 

BR-6,

"BRAKE PEDAL"

 , and perform step 3 again.

STOP LAMP SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check continuity between stop lamp switch terminals 1 and 2
under the following conditions.

4.

If NG, adjust stop lamp switch installation, refer to 

BR-6,

"BRAKE PEDAL"

 , and perform step 3 again.

ICC BRAKE HOLD RELAY

1.

Check continuity between ICC brake hold relay terminals 3 and
5 under the following conditions.

2.

If NG, replace ICC brake hold relay.

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

PBIB1536E

Condition

Continuity

Brake pedal: Fully released

Should not exist

Brake pedal: Slightly depressed

Should exist

PBIA9489J

Condition

Continuity

12V direct current supply between terminals 
1 and 2

Should not exist

No current supply

Should exist

PBIB0098E