Infiniti FX35 / FX45. Manual - part 574

 

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Infiniti FX35 / FX45. Manual - part 574

 

 

DTC P1564 ASCD STEERING SWITCH

EC-1057

< SERVICE INFORMATION >

[VK45DE]

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 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check voltage between ECM terminal 99 and ground with press-
ing each button.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 3.

3.

CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect combination switch harness connector M203.

4.

Check harness continuity between combination switch terminal 15 and ECM terminal 82.
Refer to Wiring Diagram.

5.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

5.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 99 and combination switch terminal 14.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

Switch

Condition

Voltage [V]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4

CANCEL switch

Pressed

Approx. 1

Released

Approx. 4

RESUME/ACCELERATE 
switch

Pressed

Approx. 3

Released

Approx. 4

SET/COAST switch

Pressed

Approx. 2

Released

Approx. 4

PBIB0311E

Continuity should exist.

Continuity should exist.

EC-1058

< SERVICE INFORMATION >

[VK45DE]

DTC P1564 ASCD STEERING SWITCH

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

7.

CHECK ASCD STEERING SWITCH

Refer to 

EC-1058, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace ASCD steering switch.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326931

ASCD STEERING SWITCH

1.

Disconnect combination switch (spiral cable) harness connector M203.

2.

Check continuity between combination switch terminals 14 and
15 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

PBIB0967E

DTC P1568 ICC FUNCTION

EC-1059

< SERVICE INFORMATION >

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DTC P1568 ICC FUNCTION

On Board Diagnosis Logic

INFOID:0000000001326932

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-724

.

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

to 

EC-726

.

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

to 

EC-1007

DTC Confirmation Procedure

INFOID:0000000001326933

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.
1.

Turn ignition switch ON.

2.

Press MAIN switch on ICC steering switch.

3.

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

4.

Press SET/COAST switch.

5.

Check DTC.

6.

If DTC is detected, go to 

EC-1059, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326934

1.

REPLACE ICC UNIT

1.

Replace ICC unit.

2.

Perform 

ACS-11

.

3.

Check DTC of ICC unit. Refer to 

ACS-35

.

>> INSPECTION END

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P1568
1568

ICC function

ECM detects a difference between signals 
from ICC unit is out of specified range.

• Harness or connectors

(The CAN communication line is open or 
shorted.)

• ICC unit
• ECM

EC-1060

< SERVICE INFORMATION >

[VK45DE]

DTC P1572 ICC BRAKE SWITCH

DTC P1572 ICC BRAKE SWITCH

Component Description

INFOID:0000000001326935

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 this input of two kinds (ON/OFF signal).
Refer to 

ACS-7

 for the ICC function.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326936

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001326937

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-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:0000000001326938

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.

PBIB2558E

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)

When the vehicle speed is above 30 km/h 
(19 MPH), 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

 

 

 

 

 

 

 

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