Theft system prevents starting Archives - Transmission Digest
Theft System Spooked

I recently fixed a neighbor’s car that wasn’t starting due to the theft system not reading the key. I’m sure that some of you are familiar with the method of fooling the security module by bypassing the passkey ignition switch with a resistor. I got a call from him a few days later saying that it messed up again with the same problem. He wanted to know if the resistor went bad.

I took a look at the car and realized that the theft light was staying on, but it wasn’t working normally. It didn’t flash with the door open and it wouldn’t set the security system. It also wouldn’t disarm with the key in either door. I realized that it was a security issue, but not a passkey problem.