Infiniti Q45. Manual - part 487

DTC P1564 ASCD STEERING SWITCH

EC-587

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC Confirmation Procedure

NBS00245

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. 

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 10 seconds.

4.

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

5.

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

6.

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

7.

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

8.

If DTC is detected, go to 

EC-589, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

EC-588

DTC P1564 ASCD STEERING SWITCH

Wiring Diagram

NBS00246

TBWM1246E

DTC P1564 ASCD STEERING SWITCH

EC-589

C

D

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F

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A

EC

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.

Diagnostic Procedure

NBS00247

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-154, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

67

B

Sensor ground
(MAF sensor, IAT sensor, 
ECT sensor, FTT sensor, 
EVAP control system pres-
sure sensor, PSP sensor, 
ASCD steering switch, 
Refrigerant pressure sen-
sor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

99

G/OR

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

PBIB2417E

EC-590

DTC P1564 ASCD STEERING SWITCH

2. 

CHECK ASCD STEERING SWITCH CIRCUIT

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Check each item indication under the following conditions.

 Without CONSULT-II

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 ASCD steering switch harness connector.

4.

Check harness continuity between ASCD steering switch terminal 2 and ECM terminal 67.
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.

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

SEC006D

Switch

Condition

Voltage [V]

MAIN switch

Pressed

Approx. 1

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.