Infiniti FX35 / FX45. Manual - part 451

ICC BRAKE SWITCH

EC-565

< SERVICE INFORMATION >

[VQ35DE]

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Diagnosis Procedure

INFOID:0000000001326453

1.

CHECK OVERALL FUNCTION

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check voltage between ECM terminal 108 and ground under the
following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK DTC WITH ICC UNIT

Refer to 

ACS-35

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3.

CHECK ICC BRAKE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

101

P/L

Stop lamp switch

[Ignition switch: OFF]
• Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]
• Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

108

SB

ICC brake switch

[Ignition switch: ON]
• Brake pedal: Slightly depressed

Approximately 0V

[Ignition switch: ON]
• Brake pedal: Fully released

BATTERY VOLTAGE
(11 - 14V)

CONDITION

INDICATION

Brake pedal: Slightly depressed

OFF

Brake pedal: Fully released

ON

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

MBIB0061E

EC-566

< SERVICE INFORMATION >

[VQ35DE]

ICC BRAKE SWITCH

2.

Disconnect ICC brake hold relay.

3.

Turn ignition switch ON.

4.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 4.

4.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT

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-III or tester.

OK or NG

OK 

>> GO TO 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E201
• 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.

PBIB1531E

Voltage: Battery voltage

PBIB1538E

PBIB1539E

Voltage: Battery voltage

PBIB0857E

ICC BRAKE SWITCH

EC-567

< SERVICE INFORMATION >

[VQ35DE]

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6.

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1.

Turn ignition switch OFF.

2.

Check harness continuity between ICC brake hold relay terminal 3 and ICC brake 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 7.

NG

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

7.

CHECK ICC BRAKE SWITCH

Refer to 

EC-567, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace ICC brake switch.

8.

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ICC brake hold relay terminal 4 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 10.

NG

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• Harness for open or short between ICC brake hold relay and ECM

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

10.

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-567, "Component Inspection"

.

OK

>> GO TO 11.

NG

>> Replace ICC brake fold relay.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326454

ICC BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

Continuity should exist.

Continuity should exist.

EC-568

< SERVICE INFORMATION >

[VQ35DE]

ICC BRAKE SWITCH

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-5

, and

perform step 3 again.

ICC BRAKE HOLD RELAY

1.

Apply 12V direct current between ICC brake hold relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 4, 6 and 7 under
the following conditions.

3.

If NG, replace ICC brake hold relay.

Condition

Continuity

Brake pedal: Fully released

Should exist.

Brake pedal: Slightly depressed

Should not exist.

SEC023D

Condition

Between terminals

Continuity

12V direct current supply 
between terminals 1 and 2

3 and 4

Should not exist.

6 and 7

Should exist.

No current supply

3 and 4

Should exist.

6 and 7

Should not exist.

MBIB0063E