Infiniti FX35 / FX45. Manual - part 576

 

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Infiniti FX35 / FX45. Manual - part 576

 

 

DTC P1572 ICC BRAKE SWITCH

EC-1065

< SERVICE INFORMATION >

[VK45DE]

C

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EC

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4.

Check voltage between ICC brake switch terminal 1 and ground
with CONSULT-III or tester.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E201
• 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.

7.

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1.

Turn ignition switch OFF.

2.

Check harness continuity between ICC brake hold relay terminal 3 and ICC brake switch terminal 2. 
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

8.

CHECK ICC BRAKE SWITCH

Refer to 

EC-1067, "Component Inspection"

.

OK or NG

OK

>> GO TO 17.

NG

>> Replace ICC brake switch.

9.

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 hold relay terminal 4 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 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• Harness for open or short between ICC brake hold relay and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

11.

CHECK ICC BRAKE HOLD RELAY

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

Continuity should exist.

EC-1066

< SERVICE INFORMATION >

[VK45DE]

DTC P1572 ICC BRAKE SWITCH

Refer to 

EC-1067, "Component Inspection"

.

OK

>> GO TO 17.

NG

>> Replace ICC brake hold relay.

12.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check voltage between stop lamp switch terminal 1 and ground
with CONSULT -II or tester.

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 13.

13.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E201
• 10A fuse
• Harness for open or short between stop lamp switch and battery

>> Repair open circuit or short to ground or short to power in harness or connectors.

14.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• Harness for open or short between ECM and stop lamp switch

>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2558E

Voltage: Battery voltage

PBIB1184E

Continuity should exist.

DTC P1572 ICC BRAKE SWITCH

EC-1067

< SERVICE INFORMATION >

[VK45DE]

C

D

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EC

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16.

CHECK STOP LAMP SWITCH

Refer to 

EC-1067, "Component Inspection"

 

OK or NG

OK

>> GO TO 17.

NG

>> Replace stop lamp switch.

17.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326941

ICC BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Check continuity between ICC brake switch terminals 1 and 2
under the following conditions.

4.

If NG, adjust ICC brake switch installation, refer to 

BR-5

, and

perform step 3 again.

STOP LAMP SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check continuity between stop lamp switch terminals 1 and 2
under the following conditions.

4.

If NG, adjust stop lamp switch installation, refer to 

BR-5

, and

perform step 3 again.

ICC BRAKE HOLD RELAY

1.

Apply 12V direct current between ICC brake hold relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 4, 6 and 7 under
the following conditions.

3.

If NG, replace ICC brake hold relay.

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

PBIB1536E

Condition

Continuity

Brake pedal: Fully released

Should not exist

Brake pedal: Slightly depressed

Should exist

PBIB1535E

Condition

Between terminals

Continuity

12V direct current supply 
between terminals 1 and 2

3 and 4

Should not exist

6 and 7

Should exist

No current supply

3 and 4

Should exist

6 and 7

Should not exist

MBIB0063E

EC-1068

< SERVICE INFORMATION >

[VK45DE]

DTC P1572 ASCD BRAKE SWITCH

DTC P1572 ASCD BRAKE SWITCH

Component Description

INFOID:0000000001326942

When the brake pedal is depressed, ASCD 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 

EC-615

 for the ASCD function.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326943

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001326944

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

to 

EC-1007

.

• 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:0000000001326945

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. 

PBIB2558E

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW1
(ASCD 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

ASCD brake switch

A)

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

• Harness or connectors

(The stop lamp switch circuit is shorted.)

• Harness or connectors

(The ASCD brake switch circuit is shorted.)

• Stop lamp switch
• ASCD brake switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• ECM

B)

ASCD brake switch signal is not sent to 
ECM for extremely long time while the ve-
hicle is driving.

 

 

 

 

 

 

 

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