Infiniti FX35 / FX45. Manual - part 573

DTC P1564 ASCD STEERING SWITCH

EC-1053

< SERVICE INFORMATION >

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DTC P1564 ASCD STEERING SWITCH

Component Description

INFOID:0000000001326925

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.

Refer to 

EC-615

 for the ASCD function.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326926

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001326927

This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-1007

.

1.

ASCD steering switch

2.

MAIN switch

3.

DISTANCE switch
(ICC models only)

4.

CANCEL switch

5.

SET/COAST switch

6.

RESUME/ACCELERATE switch

PBIB3241E

MONITOR ITEM

CONDITION

SPECIFICATION

MAIN SW

• Ignition switch: ON

MAIN switch: Pressed

ON

MAIN switch: Released

OFF

CANCEL SW

• Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

• Ignition switch: ON

RESUME/ACCELERATE switch: 
Pressed

ON

RESUME/ACCELERATE switch: Re-
leased

OFF

SET SW

• Ignition switch: ON

SET/COAST switch: Pressed

ON

SET/COAST switch: Released

OFF

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P1564
1564

ASCD steering switch

• An excessively high voltage signal from the ASCD 

steering switch is sent to ECM.

• ECM detects that input signal from the ASCD steer-

ing switch is out of the specified range.

• ECM detects that the ASCD steering switch is stuck 

ON.

• Harness or connectors

(The switch circuit is open or shorted.)

• ASCD steering switch
• ECM

EC-1054

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DTC P1564 ASCD STEERING SWITCH

DTC Confirmation Procedure

INFOID:0000000001326928

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. 

1.

Turn ignition switch ON and wait at least 10 seconds.

2.

Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

3.

Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

4.

Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.

5.

Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.

6.

Check DTC.

7.

If DTC is detected, go to 

EC-1056, "Diagnosis Procedure"

.

DTC P1564 ASCD STEERING SWITCH

EC-1055

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Wiring Diagram

INFOID:0000000001326929

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.

TBWM0725E

EC-1056

< SERVICE INFORMATION >

[VK45DE]

DTC P1564 ASCD STEERING SWITCH

Diagnosis Procedure

INFOID:0000000001326930

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.
Refer to 

EC-723, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK ASCD STEERING SWITCH CIRCUIT

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT-III.

3.

Check each item indication under the following conditions.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

82

B/W

Sensor ground

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

99

G/Y

ASCD steering switch

[Ignition switch: ON]
• ASCD steering switch: OFF

Approximately 4V

[Ignition switch: ON]
• MAIN switch: Pressed

Approximately 0V

[Ignition switch: ON]
• CANCEL switch: Pressed

Approximately 1V

[Ignition switch: ON]
• RESUME/ACCELERATE switch: Pressed

Approximately 3V

[Ignition switch: ON]
• SET/COAST switch: Pressed

Approximately 2V

PBIB2195E

Switch Monitor 

item

Condition

Indication

MAIN switch

MAIN SW

Pressed

ON

Released

OFF

CANCEL switch

CANCEL SW

Pressed

ON

Released

OFF

RESUME/ACCEL-
ERATE switch

RESUME/ACC SW

Pressed

ON

Released

OFF

SET/COAST switch

SET SW

Pressed

ON

Released

OFF