Lexus IS Terminal 15 Ignition Error

Sounds frustrating. The Terminal 15 issue points to your ignition circuit. Before going too far, did you check the battery terminals to make sure they're clean and tight? A loose connection can cause similar problems. Also, try wiggling the wiring harness near the ignition switch while starting the car. It's like checking a water hose for water in your garden.

Thanks, I checked the battery terminals, and they're clean and secure. I'll try wiggling the wiring harness near the ignition switch. Can you be more specific about which part of the harness to focus on? Is there a connector or section that's more likely to cause this?

Given the symptoms and error code, it's likely a break or short in the circuit, not the harness itself. If you've checked the battery and fuses and wiggling the harness doesn't help, get a diagnostic scan by a technician. You could keep trying, but you risk making it worse. It's like trying to fix a TV yourself and breaking it even more.

I appreciate the insights. I took the car to a workshop for a diagnostic scan, as you suggested. It turned out to be a defective cable. The repair cost 95€ Thanks for the advice.