Infiniti FX35 / FX45. Manual - part 575

 

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Infiniti FX35 / FX45. Manual - part 575

 

 

DTC P1572 ICC BRAKE SWITCH

EC-1061

< SERVICE INFORMATION >

[VK45DE]

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• Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for

malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected. 

TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.

 WITH CONSULT-III

1.

Start engine (VDC switch OFF).

2.

Select “DATA MONITOR” mode with CONSULT-III.

3.

Press MAIN switch and make sure that CRUISE lamp lights up.

4.

Drive the vehicle for at least 5 consecutive seconds under the following conditions.

5.

Check 1st trip DTC.

6.

If 1st trip DTC is detected, go to 

EC-1063, "Diagnosis Procedure"

.

If 1st trip DTC is not detected, go to the following step.

7.

Drive the vehicle for at least 5 consecutive seconds under the following conditions.

8.

Check 1st trip DTC.

9.

If 1st trip DTC is detected, go to 

EC-1063, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-III” above.

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position 

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position 

Driving location

Depress the brake pedal for more than 
five seconds so as not to come off from 
the above-mentioned vehicle speed.

EC-1062

< SERVICE INFORMATION >

[VK45DE]

DTC P1572 ICC BRAKE SWITCH

Wiring Diagram

INFOID:0000000001326939

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1351E

DTC P1572 ICC BRAKE SWITCH

EC-1063

< SERVICE INFORMATION >

[VK45DE]

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Diagnosis Procedure

INFOID:0000000001326940

1.

CHECK OVERALL FUNCTION-I

 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

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT-III

Check “BRAKE SW2” indication in “DATA MONITOR” mode. 

 Without CONSULT-III

TER-

MI-

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

When brake pedal: Slightly depressed

OFF

When brake pedal: Fully released

ON

CONDITION

VOLTAGE

When brake pedal: Slightly depressed

Approximately 0V

When brake pedal: Fully released

Battery voltage

MBIB0061E

CONDITION

INDICATION

When brake pedal: Fully released

OFF

When brake pedal: Slightly depressed

ON

EC-1064

< SERVICE INFORMATION >

[VK45DE]

DTC P1572 ICC BRAKE SWITCH

Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.

OK or NG

OK

>> GO TO 17.

NG

>> GO TO 12.

3.

CHECK DTC WITH ICC UNIT

Refer to 

ACS-35

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace.

4.

CHECK ICC BRAKE SWITCH CIRCUIT

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 3 and
ground with CONSULT-III or tester.

OK or NG

OK 

>> GO TO 9.

NG

>> GO TO 5.

5.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Turn ignition switch ON.

CONDITION

VOLTAGE

When brake pedal: Fully released

Approximately 0V

When brake pedal: Slightly depressed

Battery voltage

PBIB1537E

PBIB1531E

Voltage: Battery voltage

PBIB1538E

PBIB2558E

 

 

 

 

 

 

 

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