Infiniti FX35 / FX45. Manual - part 426

 

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Infiniti FX35 / FX45. Manual - part 426

 

 

DTC P1572 ICC BRAKE SWITCH

EC-465

< SERVICE INFORMATION >

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DTC P1572 ICC BRAKE SWITCH

Component Description

INFOID:0000000001326330

When the brake pedal is depressed, ICC brake switch is turned OFF
and stop lamp switch is turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal).
Refer to 

ACS-7

 for the ICC function.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326331

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001326332

• This self-diagnosis has the one trip detection logic.
• The MIL will not light up for this self-diagnosis.
NOTE:
• If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-422

• This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not

stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.

DTC Confirmation Procedure

INFOID:0000000001326333

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

PBIB1539E

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW1
(ICC brake switch)

• Ignition switch: ON

• Brake pedal: Fully released

ON

• Brake pedal: Slightly depressed

OFF

BRAKE SW2
(Stop lamp switch)

• Ignition switch: ON

• Brake pedal: Fully released

OFF

• Brake pedal: Slightly depressed

ON

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P1572
1572

ICC brake switch

A)

When the vehicle speed is above 30km/h (19 
MPH), ON signals from the stop lamp switch 
and the ICC brake switch are sent to ECM at 
the same time.

• Harness or connectors

(Stop lamp switch circuit is shorted.)

• Harness or connectors

(ICC brake switch circuit is shorted.)

• Stop lamp switch
• ICC brake switch
• ICC brake hold relay
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• ECM

B)

ICC brake switch signal is not sent to ECM 
for extremely long time while the vehicle is 
driving

EC-466

< SERVICE INFORMATION >

[VQ35DE]

DTC P1572 ICC BRAKE SWITCH

• 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.

2.

Select “DATA MONITOR” mode with CONSULT-III.

3.

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

4.

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

5.

Check 1st trip DTC.
If 1st trip DTC is detected, go to 

EC-468, "Diagnosis Procedure"

.

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

6.

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

7.

Check 1st trip DTC.

8.

If 1st trip DTC is detected, go to 

EC-468, "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.

DTC P1572 ICC BRAKE SWITCH

EC-467

< SERVICE INFORMATION >

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Wiring Diagram

INFOID:0000000001326334

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.

TBWM1401E

EC-468

< SERVICE INFORMATION >

[VQ35DE]

DTC P1572 ICC BRAKE SWITCH

Diagnosis Procedure

INFOID:0000000001326335

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

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

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

 

 

 

 

 

 

 

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