Infiniti Q45. Manual - part 490

DTC P1572 ICC BRAKE SWITCH

EC-599

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4. 

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between ICC brake switch terminal 1 and ground
with CONSULT-II or tester.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 5.

5. 

CHECK ICC BRAKE SWITCH CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake hold relay.

3.

Turn ignition switch ON.

4.

Check voltage between ICC brake hold relay terminal 4 and
ground with CONSULT-II or tester.

OK or NG

OK >> GO 

TO 

7.

NG

>> GO TO 6.

PBIB2433E

Voltage: Battery voltage

PBIB0857E

PBIB2427E

Voltage: Battery voltage

MBIB0059E

EC-600

DTC P1572 ICC BRAKE SWITCH

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) No. 1 connector M1

●

10A fuse

●

Harness connectors M15, E205

●

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

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

7. 

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Check harness continuity between ICC brake hold relay terminal 3 and ICC brake switch terminal 1.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E205, M15

●

Harness connectors M61, M401

●

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

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

9. 

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-602, "Component Inspection"

 .

OK

>> GO TO 18.

NG

>> Replace ICC brake hold relay.

10. 

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 12.

NG

>> GO TO 11.

Continuity should exist.

Continuity should exist.

DTC P1572 ICC BRAKE SWITCH

EC-601

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11. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M401, M61

●

Harness connectors M135, F105

●

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.

12. 

CHECK ICC BRAKE SWITCH

Refer to 

EC-602, "Component Inspection"

 .

OK or NG

OK

>> GO TO 18.

NG

>> Replace ICC brake switch.

13. 

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check voltage between stop lamp switch terminal 3 and ground
with CONSULT -II or tester.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 14.

14. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) No. 1 connector M1

●

10A fuse

●

Harness connectors M61, M401

●

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.

PBIB2433E

Voltage: Battery voltage

PBIB2102E

EC-602

DTC P1572 ICC BRAKE SWITCH

15. 

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 4.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 17.

NG

>> GO TO 16.

16. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M401, M61

●

Harness connectors M135, F105

●

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.

17. 

CHECK STOP LAMP SWITCH

Refer to 

EC-602, "Component Inspection"

  

OK or NG

OK

>> GO TO 18.

NG

>> Replace stop lamp switch.

18. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS0024I

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.

If NG, adjust ICC brake switch installation, refer to 

BR-6,

"BRAKE PEDAL"

 , and perform step 3 again.

Continuity should exist.

Condition

Continuity

When brake pedal: Fully released.

Should exist.

When brake pedal: Slightly depressed.

Should not exist.

PBIB1536E