Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP1564ASCD STEERING SWITCH
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
ASCD Steering Switch
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION ASCD Steering Switch
DTC P1564 ASCD STEERING SWITCH
Component Description
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. Automatic Speed Control Device (ASCD)
CONSULT-III Reference Value in Data Monitor Mode
On Board Diagnosis Logic
DTC Confirmation Procedure
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 seconds.
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 "Diagnosis Procedure".
Wiring Diagram
Diagnosis Procedure
Component Inspection
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.
Component Description
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. Automatic Speed Control Device (ASCD)
CONSULT-III Reference Value in Data Monitor Mode
On Board Diagnosis Logic
DTC Confirmation Procedure
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 seconds.
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 "Diagnosis Procedure".
Wiring Diagram
EC-ASC/SW-01:
Diagnosis Procedure
Step 1-2:
Step 2 (Continued)-6:
Step 6 (Continued)-8:
Component Inspection
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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.