Infiniti Q45. Manual - part 521

ICC BRAKE SWITCH

EC-723

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS0027P

TBWM1259E

EC-724

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

NBS0027Q

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 depress

OFF

When brake pedal: Fully released

ON

SEC011D

CONDITION

VOLTAGE

When brake pedal: Slightly depress

Approximately 0V

When brake pedal: Fully released

Battery voltage

MBIB0061E

ICC BRAKE SWITCH

EC-725

C

D

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F

G

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J

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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

>> INSPECTION END

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

EC-726

ICC BRAKE SWITCH

4. 

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

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 

10.

NG

>> GO TO 5.

5. 

CHECK ICC BRAKE SWITCH CIRCUIT-II

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 4 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

PBIB2433E

Voltage: Battery voltage

PBIB0857E

PBIB2427E

Voltage: Battery voltage

MBIB0059E