Infiniti M35/M45 Y50. Manual - part 524

DTC P1572 ICC BRAKE SWITCH

EC-569

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram 

NBS00554

TBWT0984E

EC-570

[VQ35DE]

DTC P1572 ICC BRAKE SWITCH

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.

Diagnostic Procedure

NBS00555

1. 

CHECK OVERALL FUNCTION-I

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CON-
SULT-II.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-II

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.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

101

V/R

Stop lamp switch

[Ignition switch: OFF]

●

Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]

●

Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

108

BR

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

SEC011D

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

MBIB0061E

DTC P1572 ICC BRAKE SWITCH

EC-571

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

2. 

CHECK OVERALL FUNCTION-II

 With CONSULT-II

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

 Without CONSULT-II

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

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 8.

3. 

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch (2) harness connector.

–

Stop lamp switch (1)

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 5.

NG

>> GO TO 4.

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

SEC013D

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

PBIB1537E

PBIB2705E

Voltage: Battery voltage

PBIB0857E

EC-572

[VQ35DE]

DTC P1572 ICC BRAKE SWITCH

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E102

●

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.

5. 

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 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 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

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.

7. 

CHECK ICC BRAKE SWITCH

Refer to 

EC-575, "Component Inspection"

 .

OK or NG

OK

>> GO TO 15.

NG

>> Replace ICC brake switch.

8. 

CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

Refer to 

ACS-40, "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace.

Continuity should exist.