Infiniti Q45. Manual - part 16

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-57

[ICC]

C

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ACS

2. 

CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH

 With CONSULT-II

With “ICC” “DATA MONITOR”, check that “STOP LAMP SW” and “BRAKE SW” operate normally. Refer to

ACS-34, "DATA MONITOR"

 .

OK or NG

OK

>> GO TO 12.

NG

>>

●

BRAKE SW: GO TO 3.

●

STOP LAMP SW: GO TO 9.

3. 

CHECK BRAKE SWITCH INSTALLATION AND ADJUSTMENT

Check ICC brake switch for proper installation, and adjust the switch if necessary. Refer to 

BR-6, "BRAKE

PEDAL"

 .

OK or NG

OK

>> GO TO 4.

NG

>> After adjustment, erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

4. 

CHECK ICC BRAKE SWITCH AND STOP LAMP SWITCH

Check ICC brake switch and stop lamp switch. Refer to 

ACS-78, "ICC Brake Switch and Stop Lamp Switch"

 .

OK or NG

OK

>> GO TO 5.

NG

>> 1. Replace ICC brake switch.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

5. 

CHECK ICC BRAKE HOLD RELAY 

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake hold relay.

3.

Check ICC brake hold relay. Refer to 

ACS-78, "ICC BRAKE HOLD RELAY"

 . 

OK or NG

OK

>> GO TO 6.

NG

>> 1. Replace ICC brake hold relay.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

ACS-58

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

6. 

CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC BRAKE SWITCH

1.

Disconnect ICC brake switch connector and ICC unit connector. 

2.

Check continuity between ICC brake hold relay harness connec-
tor and ICC brake switch harness connector.

3.

Check continuity between ICC brake hold relay harness connec-
tor and ground.

OK or NG

OK

>> GO TO 7.

NG

>> 1. Repair harness between ICC brake hold relay and ICC brake switch.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

7. 

CHECK HARNESS BETWEEN ICC UNIT AND ICC BRAKE HOLD RELAY

1.

Check continuity between ICC unit harness connector and ICC
brake hold relay harness connector.

2.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> GO TO 8.

NG

>> 1. Repair harness between ICC unit and ICC brake hold relay.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

ICC brake hold 

relay connector

Terminal

ICC brake switch 

connector

Terminal

Continuity

E38

3

M404

1

Yes

ICC brake hold 

relay connector

Terminal

Ground

Continuity

E38

3

No

PKIA9909E

ICC unit connector

Terminal

ICC brake hold relay 

connector

Terminal

Continuity

B244

47

E38

1

Yes

ICC unit connector

Terminal

Ground

Continuity

B244

47

No

SKIA1272E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-59

[ICC]

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8. 

CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 

1.

Turn ignition switch ON.

2.

Check voltage between ICC brake hold relay harness connector
and ground.

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NG

>> 1. Repair or replace harness or fuse.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

9. 

CHECK BRAKE LAMP ILLUMINATION

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake hold relay connector.

3.

Check stop lamp circuit.

OK or NG

OK

>> GO TO 10.

NG

>> After repairing, erase DTC and perform ICC system running test. Then perform self-diagnosis of

ICC system again.

10. 

CHECK ICC BRAKE HOLD RELAY CIRCUIT 

1.

Connect ICC brake hold relay connector.

2.

Disconnect stop lamp switch connector.

3.

When brake pedal is not depressed, make sure that stop lamp does not illuminate.

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NG

>> GO TO 11.

11. 

CHECK ICC BRAKE HOLD RELAY 

1.

Disconnect ICC brake hold relay.

2.

Check ICC brake hold relay. Refer to 

ACS-78, "ICC BRAKE HOLD RELAY"

 .

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NG

>> 1. Replace ICC brake hold relay.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

Terminals

Voltage (Approx.)

(+)

(

−

)

ICC brake hold 

relay connector

Terminal

E38

4

Ground

Battery voltage

SKIA1194E

ACS-60

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

12. 

 CHECK HARNESS BETWEEN ICC UNIT AND ICC BRAKE HOLD RELAY

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and ICC brake hold relay.

3.

Check continuity between ICC unit harness connector and ICC
brake hold relay harness connector.

4.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> GO TO 13.

NG

>> 1. Repair harness between ICC unit and ICC brake hold relay.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

13. 

CHECK ICC BRAKE HOLD RELAY GROUND CIRCUIT

Check continuity between ICC brake hold relay harness connector
and ground.

OK or NG

OK

>> GO TO 14.

NG

>> 1. Repair harness between ICC brake hold relay and

ground.

2. Erase DTC and perform ICC system running test.

Then perform self-diagnosis of ICC system again.

14. 

CHECK ICC BRAKE HOLD RELAY 

Check ICC brake hold relay. Refer to 

ACS-78, "ICC BRAKE HOLD RELAY"

 .

OK or NG

OK

>> GO TO 15.

NG

>> 1. Replace ICC brake hold relay.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

ICC unit connector

Terminal

ICC brake hold relay 

connector

Terminal

Continuity

B244

47

E38

1

Yes

ICC unit connector

Terminal

Ground

Continuity

B244

47

No

SKIA6660E

ICC brake hold 

relay connector

Terminal

Ground

Continuity

E38

2

Yes

SKIA6661E