'02 SSEI Won't start, dealer can't figure out

[colaz71]

I have a '02 SSEI that started kicking up all the warning lights.(service vehicle soon,air bags, service theft system, service stability system, and alarm occcured.) Also traction control will not turn on. States unknown driver and will not start. Stereo will not work, a/c will not work but regular air does, windows sometimes work, keyless entry won't work either. Sometimes all gauges work, but most of the time only speedometer, tachometer, and temp gauges work. Power seats work though.

After unplugging battery and plugging it back in. Messing with the ignition on and off. Also sometimes after messing with it. I can shut the door and walk away. Then the doors will unlock by themselves and I can use the keyless entry and start it just fine. Yet after letting sit. The problem arises all over again.

The dealership has replaced the keypass lock sensor, theft deterrant module. I replaced the battery before the sensor and module was replaced also.

Anyone have any ideas?

It would be appreciated

[GTP Dad]

It sounds like you have a bad body control module as the majority of the systems you speak of are controlled by it. Also you may want to check all grounds including the main ground to make sure everything is properly conducting. I don't know if it will help but it can't hurt.

[clutch492]

There is a ground connection bridge under the carpet, on the drivers' side, right near the front of the door frame. pull the carpet out from under the plastic trim located beside the seat. You will find a connector with about 8 to 10 ground wires. take off the black cover. you will find a strip of metal that connects all the grounds together. pull it out. You will see corrosion on some of the terminals. clean them with a wire wheel and reassemble. These are all the major ground connections for the car. The fuel pump grounds here as well. This is what is causing your electrical problem and why your car is stalling. I discovered this while searching this site in the past. And, it was correct. It cured the troubles with the bonneville I was working on.