Infiniti FX35, FX50 (S51). Manual - part 878

 

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Infiniti FX35, FX50 (S51). Manual - part 878

 

 

P1572 ICC BRAKE SWITCH

EC-1053

< DTC/CIRCUIT DIAGNOSIS >

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P1572 ICC BRAKE SWITCH

Description

INFOID:0000000005237547

When the brake pedal is depressed, ICC brake switch is turned OFF and stop lamp switch is turned ON. ECM
detects the state of the brake pedal by those two types of input (ON/OFF signal).
Refer to 

CCS-24, "System Description"

 for the ICC function.

DTC Logic

INFOID:0000000005237548

DTC DETECTION LOGIC

NOTE:
• If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-962, "DTC Logic"

.

• 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 is turned OFF. And even when malfunction A is detected
in two consecutive trips, DTC is not stored in ECM memory.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

NOTE:
The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure
for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can
be detected.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine (VDC switch OFF).

2.

Press MAIN switch and check that CRUISE indicator is displayed in combination meter.

3.

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

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure 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.

4.

Check 1st trip DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1572

ICC brake switch

A)

ON signals from the stop lamp switch 
and the ICC brake switch are sent to 
ECM at the same time.

• Harness or connectors

(The stop lamp switch circuit is shorted.)

• Harness or connectors

(The ICC brake switch circuit is shorted.)

• Stop lamp switch
• ICC brake switch
• ICC brake hold relay
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• ECM

B)

ICC brake switch signal is not sent to 
ECM for extremely long time while the 
vehicle is being driven

Vehicle speed

More than 30 km/h (19 mph)

Selector lever

Suitable position 

EC-1054

< DTC/CIRCUIT DIAGNOSIS >

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P1572 ICC BRAKE SWITCH

Is 1st trip DTC detected?

YES

>> Go to 

EC-1054, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1.

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

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure 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.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1054, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237549

1.

CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

Refer to 

CCS-44, "Diagnosis Description"

.

Are any DTCs detected?

YES

>> Perform the Diagnosis Procedure corresponding to the detected DTC.

NO

>> GO TO 2.

2.

CHECK OVERALL FUNCTION-I

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK OVERALL FUNCTION-II

 With CONSULT-III

Vehicle speed

More than 30 km/h (19 mph)

Selector lever

Suitable position 

Driving location

Depress the brake pedal for more than 5 seconds so as 
not to come off from the above-mentioned vehicle speed.

Monitor item

Condition

Indication

BRAKE SW1
(ICC brake switch)

Brake pedal

Slightly depressed

OFF

Fully released

ON

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

M160

117

(ICC brake switch signal)

128

Brake pedal

Slightly depressed

Approx. 0

Fully released

Battery voltage

P1572 ICC BRAKE SWITCH

EC-1055

< DTC/CIRCUIT DIAGNOSIS >

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Select “BRAKE SW2” and check indication under the following conditions.

 Without CONSULT-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> GO TO 11.

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 the voltage between ICC brake switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 5.

5.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake hold relay.

3.

Turn ignition switch ON.

4.

Check the voltage between ICC brake hold relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ICC brake hold relay and fuse

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

7.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-III

Monitor item

Condition

Indication

BRAKE SW2
(Stop lamp switch)

Brake pedal

Slightly depressed

ON

Fully released

OFF

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

M160

110

(Stop lamp switch signal)

128

Brake pedal

Slightly depressed

Battery voltage

Fully released

Approx. 0

ICC brake switch

Ground

Voltage

Connector

Terminal

E114

1

Ground

Battery voltage

ICC brake hold relay

Ground

Voltage

Connector

Terminal

E91

3

Ground

Battery voltage

EC-1056

< DTC/CIRCUIT DIAGNOSIS >

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P1572 ICC BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Check the continuity between ICC brake switch harness connector and ICC brake hold relay harness con-
nector.

3.

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

Is the inspection result normal?

YES

>> GO TO 16.

NO

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

8.

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ICC brake switch harness connector and ECM harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• Harness for open or short between ICC brake switch and ECM

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

10.

CHECK ICC BRAKE SWITCH

Refer to 

EC-1057, "Component Inspection (ICC Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace ICC brake switch.

11.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Disconnect ICC brake hold relay.

4.

Check the voltage between stop lamp switch harness connector and ground.

5.

Check the voltage between ICC brake hold relay harness connector and ground.

Is the inspection result normal?

ICC brake switch

ICC brake hold relay

Continuity

Connector

Terminal

Connector

Terminal

E114

1

E91

4

Existed

ICC brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E114

2

M160

117

Existed

Stop lamp switch

Ground

Voltage

Connector

Terminal

E110

3

Ground

Battery voltage

ICC brake hold relay

Ground

Voltage

Connector

Terminal

E91

7

Ground

Battery voltage

 

 

 

 

 

 

 

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