Infiniti FX35, FX50 (S51). Manual - part 875

P1564 ASCD STEERING SWITCH

EC-1041

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1564 ASCD STEERING SWITCH

Description

INFOID:0000000005237532

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-631, "System Description"

 for the ASCD function.

DTC Logic

INFOID:0000000005237533

DTC DETECTION LOGIC

NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-962, "DTC Logic"

.

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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.

Is DTC detected?

YES

>> Go to 

EC-1041, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237534

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ASCD STEERING SWITCH CIRCUIT

 With CONSULT-III

1.

Turn ignition switch ON.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1564

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 steering 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-1042

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1564 ASCD STEERING SWITCH

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.

 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 8.

NO

>> 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.

4.

Check the continuity between combination switch and ECM harness connector.

5.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> 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, short to ground or short to power in harness or connectors.

5.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Monitor item

Condition

Indication

MAIN SW

MAIN switch

Pressed

ON

Released

OFF

CANCEL SW

CANCEL switch

Pressed

ON

Released

OFF

RESUME/ACC SW

RESUME/ACCELERATE 
switch

Pressed

ON

Released

OFF

SET SW

SET/COAST switch

Pressed

ON

Released

OFF

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

M160

102

(ASCD steering switch signal)

111

MAIN switch: Pressed

Approx. 0

CANCEL switch: Pressed

Approx. 1

SET/COAST switch: Pressed

Approx. 2

RESUME/ACCELERATE switch: Pressed

Approx. 3

All ASCD steering switches: Released

Approx. 4

Combination switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

—

16

M160

111

Existed

P1564 ASCD STEERING SWITCH

EC-1043

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1.

Check the continuity between combination switch and ECM harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

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

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

7.

CHECK ASCD STEERING SWITCH

Refer to 

EC-1043, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace ASCD steering switch.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237535

1.

CHECK ASCD STEERING SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect combination switch (spiral cable) harness connector M303.

3.

Check resistance between combination switch harness connector terminals under the following condi-
tions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ASCD steering switch

Combination switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

—

13

M160

102

Existed

Combination switch

Condition

Resistance (

Ω

)

Connector

Terminals

M303

13 and 16

MAIN switch: Pressed

Approx. 0

CANCEL switch: Pressed

Approx. 250

SET/COAST switch: Pressed

Approx. 660

RESUME/ACCELERATE switch: Pressed

Approx. 1,480

All ASCD steering switches: Released

Approx. 4,000

EC-1044

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1564 ICC STEERING SWITCH

P1564 ICC STEERING SWITCH

Description

INFOID:0000000005237536

ICC 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 

CCS-24, "System Description"

 for the ICC function.

DTC Logic

INFOID:0000000005237537

DTC DETECTION LOGIC

NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-962, "DTC Logic"

.

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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.

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

7.

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

8.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-1044, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237538

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ICC STEERING SWITCH CIRCUIT

1.

Turn ignition switch ON.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1564

ICC steering switch

• An excessively high voltage signal from the 

ICC steering switch is sent to ECM.

• ECM detects that input signal from the ICC 

steering switch is out of the specified range.

• ECM detects that the ICC steering switch is 

stuck ON.

• Harness or connectors

(The switch circuit is open or shorted.)

• ICC steering switch
• ECM