Infiniti M35/M45 Y50. Manual - part 524

 

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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.

 

 

 

 

 

 

 

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