So, having done some research on the P1564 error code on a Nissan, I found that it’s caused by the ASCD Steering Switch Fault—or basically that the cruise control buttons on the steering wheel aren’t communicating with the car’s ECM (the onboard computer) properly. What I found, this can happen for a couple of reasons, and people have figured out several ways to fix it.
Why Does the P1564 Code Occur?
Most common reasons are:
Blown Fuse – Simple issue but simple to overlook. When the fuse that controls the ASCD system blows, the cruise control feature is lost.
Faulty ASCD Steering Switch – Many owners found that their steering wheel buttons were just worn out or not working.
Faulty ASCD Switch Harness – Wiring issues seem to be another common culprit, with broken or corroded wires keeping signals from getting through.
Wiring Issues within the ASCD Steering Circuit – Some had to test the entire wiring circuit for breaks or shorts.
Faulty Clock Spring – This was a common complaint, especially if other functions of the steering wheel (like the horn or airbag light) were also malfunctioning.
ECM Problems – Uncommon, but a few discovered that once they ruled everything else out, a defective ECM was the cause.
What Happens When This Code is Detected?
Here are the reasons:
Cruise control fails to operate altogether or sporadically loses its functionality.
The check engine light is activated.
The buttons on the steering wheel become nonresponsive.
How Others Have Corrected It and How It Can Be Repaired
Step 1: Try the Fuses Some said it was the only thing they had to do: inspect and replace a faulty fuse. It’s a quick, easy first step.
Step 2: Examine the Steering Switch and Wires
Others found that attempting the wires
with a multimeter enabled them to track down the cause of the issue.
Others just checked for the obvious
damage—loose connections or charred wiring were common causes.
If the switch itself was faulty, a new steering switch fixed the issue for many.
Step 3: Check the Clock Spring
I have had a number of cases where a faulty clock spring was the issue, especially if the horn or airbag light was also faulty.
Since the clock spring connects all of the steering wheel buttons to the electrical system, a replacement fixed the issue in those cases.
Step 4: Test the ASCD Switch Voltage Nissan owners checked the G/Y (Green/Yellow) wire at the ASCD switch with the ignition switch on. The following readings were expected:
OFF position: ~4.0V
CRUISE ON: ~0V
CANCEL pressed: ~1V
COAST/SET activated: ~2V
ACCEL/RES engaged: ~3V
If the readings were not correct, it was a wiring issue or a bad switch.
Step 5: Replacing Faulty Parts
Most found that a replacement of the steering switch assembly was the easiest fix if the switch was not functioning.
If the clock spring was bad, replacing it fixed the problem for some.
Note: Some warned against removing the battery and allowing it to sit for at least 10-15 minutes before fiddling with the steering wheel to avoid an accidental airbag deployment.
I tried to walk through all that I found about the Nissan P1564 code and what could be causing it. If you follow these steps, you should be able to diagnose and fix the problem. If you have experienced this problem and what you used to get it to work, please let me know.