Infiniti M35/M45 Y50. Manual - part 523

DTC P1564 ASCD STEERING SWITCH

EC-565

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Component Inspection

NBS0054W

ASCD STEERING SWITCH

1.

Disconnect combination switch (spiral cable) harness connector M303.

2.

Check continuity between combination switch terminals 18 and
21 with pushing each switch.

If NG, replace ASCD steering switch. 

Switch

Condition

Resistance [

Ω

]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4,000

CANCEL switch

Pressed

Approx. 250

Released

Approx. 4,000

RESUME/ACCELERATE 
switch

Pressed

Approx. 1,480

Released

Approx. 4,000

SET/COAST switch

Pressed

Approx. 660

Released

Approx. 4,000

PBIB2739E

EC-566

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DTC P1568 ICC FUNCTION

DTC P1568 ICC FUNCTION

PFP:18995

On Board Diagnosis Logic

NBS0054X

This self-diagnosis has the one trip detection logic. 
The MIL will not light up for this diagnosis. 
NOTE:

●

If DTC P1568 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to 

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

●

If DTC P1568 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-164, "DTC U1010 CAN COMMUNICATION"

 .

●

If DTC P1568 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to 

EC-483, "DTC P0605 ECM"

.

DTC Confirmation Procedure

NBS0054Y

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.
TESTING CONDITION:
Step 4 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.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Press MAIN switch on ICC steering switch.

4.

Drive the vehicle at more than 40 km/h (25 MPH).

5.

Press SET/COAST switch.

6.

If DTC is detected, go to 

EC-566, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

NBS0054Z

1. 

REPLACE ICC SENSOR INTEGRATED UNIT

1.

Replace ICC sensor integrated unit.

2.

Perform 

ACS-12, "ACTION TEST"

 .

3.

Check DTC of ICC sensor integrated unit. Refer to 

ACS-40, "TROUBLE DIAGNOSIS FOR SELF-DIAG-

NOSTIC ITEMS"

 .

>> INSPECTION END

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P1568
1568

ICC function

ECM detects a difference between signals 
from ICC sensor integrated unit is out of spec-
ified range.

●

Harness or connectors
(The CAN communication line is open or 
shorted.)

●

ICC sensor integrated unit

●

ECM

PBIB2673E

DTC P1572 ICC BRAKE SWITCH

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DTC P1572 ICC BRAKE SWITCH

PFP:25320

Component Description

NBS00550

When the brake pedal is depressed, ICC brake switch (2) is turned
OFF and stop lamp switch (1) is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to 

ACS-6, "DESCRIPTION"

  for the ICC function.

CONSULT-II Reference Value in Data Monitor Mode

NBS00551

Specification data are reference values.

On Board Diagnosis Logic

NBS00552

This 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-483, "DTC P0605 ECM"

 .

●

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.

PBIB2705E

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW1
(ICC 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

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 
driving

EC-568

[VQ35DE]

DTC P1572 ICC BRAKE SWITCH

DTC Confirmation Procedure

NBS00553

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-570, "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-570, "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.