So, after looking into the P1564 error code on a Nissan, I found that it’s linked to the ASCD Steering Switch Fault—which basically means the cruise control buttons on the steering wheel aren’t communicating properly with the car’s ECM (the onboard computer). From what I gathered, this can happen for a few different reasons, and people have found several ways to fix it.
What Causes the P1564 Code? After going through various sources, it seems like the most common causes are:
- Blown Fuse – A simple issue but often overlooked. If the fuse controlling the ASCD system blows, the cruise control stops working.
- Faulty ASCD Steering Switch – Many owners found that their steering wheel buttons were just worn out or malfunctioning.
- Damaged ASCD Switch Harness – Wiring issues seem to be another common culprit, with broken or corroded wires stopping signals from getting through.
- Wiring Issues in the ASCD Steering Circuit – Some people had to check the entire wiring circuit for breaks or shorts.
- Bad Clock Spring – This was a recurring problem, especially if other steering wheel functions (like the horn or airbag light) were acting up too.
- ECM Issues – Rare, but some found that after eliminating everything else, a faulty ECM was to blame.
What Happens When This Code Appears? Based on reports, here’s what drivers typically experience:
- Cruise control either doesn’t work at all or randomly stops working.
- The check engine light comes on.
- The steering wheel buttons stop responding.
How Others Have Fixed It and How It Can Be Fixed
Step 1: Check the Fuses A few people mentioned that checking and replacing a blown fuse was all they needed to do. It’s a quick and easy first step.
Step 2: Inspect the Steering Switch and Wiring
- Some found that testing the wiring with a multimeter helped them pinpoint the issue.
- Others simply checked for visible damage—loose connections or frayed wires were a common problem.
- If the switch itself was faulty, replacing the steering switch fixed the issue for many.
Step 3: Check the Clock Spring
- I saw multiple cases where a faulty clock spring was the issue, especially if the horn or airbag light was also malfunctioning.
- Since the clock spring connects all the steering wheel buttons to the electrical system, replacing it solved the problem in those cases.
Step 4: Test the ASCD Switch Voltage Some Nissan owners tested the G/Y (Green/Yellow) wire at the ASCD switch with the ignition on. Here are the expected values:
- OFF position: ~4.0V
- CRUISE ON: ~0V
- CANCEL pressed: ~1V
- COAST/SET activated: ~2V
- ACCEL/RES engaged: ~3V
If the readings were off, it indicated a wiring issue or a bad switch.
Step 5: Replacing Faulty Parts
- Many found that replacing the steering switch assembly was the easiest fix if the switch wasn’t responding.
- If the clock spring was bad, replacing it solved the problem for others.
- Important: Several people warned about disconnecting the battery and waiting at least 10-15 minutes before working on the steering wheel to avoid an accidental airbag deployment.
I tried to explain everything 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 issue. Let me know if you’ve had this problem and what worked for you.
