Infiniti Q45. Manual - part 489

 

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Infiniti Q45. Manual - part 489

 

 

DTC P1572 ICC BRAKE SWITCH

EC-595

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC Confirmation Procedure

NBS0024F

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.

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-II

1.

Start engine (VDC switch OFF).

2.

Select “DATA MONITOR” mode with CONSULT-II.

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.

If 1st trip DTC is detected, go to 

EC-597, "Diagnostic Procedure"

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

5.

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

6.

If 1st trip DTC is detected, go to 

EC-597, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position 

PBIB2386E

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-596

DTC P1572 ICC BRAKE SWITCH

Wiring Diagram 

NBS0024G

TBWM1247E

DTC P1572 ICC BRAKE SWITCH

EC-597

C

D

E

F

G

H

I

J

K

L

M

A

EC

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

NBS0024H

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

R/W

Stop lamp switch

[Ignition switch: OFF]

Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]

Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

108

Y/PU

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

SEC011D

CONDITION

VOLTAGE

When brake pedal: Slightly depressed

Approximately 0V

When brake pedal: Fully released

Battery voltage

MBIB0061E

EC-598

DTC P1572 ICC BRAKE SWITCH

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 18.

NG

>> GO TO 13.

3. 

CHECK DTC WITH ICC UNIT

Refer to 

ACS-43, "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace.

CONDITION

INDICATION

When brake pedal: Fully released

OFF

When brake pedal: Slightly depressed

ON

SEC013D

CONDITION

VOLTAGE

When brake pedal: Fully released

Approximately 0V

When brake pedal: Slightly depressed

Battery voltage

PBIB1537E

 

 

 

 

 

 

 

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