Need wiring help

[emmasweeny]

My car won't run but for a few seconds and throws a CEL, #12 which is the starter switch. I just replaced that with no change in behavior. I'd like to know what the other wires connected to my key switch do and how I could check them for proper operation. Could someone point me to a wiring schematic or tell me what how I can check the other three connections to the keyswitch.

Thanks much.

[Trevor]

Originally Posted by emmasweeny

My car won't run but for a few seconds and throws a CEL, #12 which is the starter switch. I just replaced that with no change in behavior. I'd like to know what the other wires connected to my key switch do and how I could check them for proper operation. Could someone point me to a wiring schematic or tell me what how I can check the other three connections to the keyswitch.

Thanks much.

By starter switch as defined by the manuals, I presume you are referring to the solenoid which is part of the starter motor assembly.

The operating circuit goes via the inhibitor switch, the security unit and whatever. There appears to be several variations between models. Several threads have covered the topic.

First check that you are getting battery voltage at the spade terminal on the solenoid. If not suspect the ignition switch. A very recent thread/post has recorded mechanical problems and loose mounting bolts affecting contact, something which has been reported before.

Do a search and I regret to say, possibly become confused. You will have to use your own initiative.

P.S. I have read the thread again and it would appear that your car starts OK but then will not run. If so, as per the next thread, this is in all respects very strange. Is it that the starter is not disengaging after you release the key? Do you hear anything strange when the car runs for a few seconds?

[b3lha]

Code 12 is unusual.

May I respectfully suggest that you try clearing the codes and then check again to ensure that your error code is definitely a 12.

[emmasweeny]

I didn't beleive the code either but I've eliminated most other possibilities. It will start and run - for a few seconds. Then it's like the switch is turned off. The piece I've replaced is the one that carries all the amps at the opposite end of the key switch.
I have a '92 if that helps.

[Trevor]

Originally Posted by emmasweeny

I didn't beleive the code either but I've eliminated most other possibilities. It will start and run - for a few seconds. Then it's like the switch is turned off. The piece I've replaced is the one that carries all the amps at the opposite end of the key switch.
I have a '92 if that helps.

You say "Then it's like the switch is turned off."

As I mentioned in an earlier post. "If not suspect the ignition switch. A very recent thread/post has recorded mechanical problems and loose mounting bolts affecting contact, something which has been reported before."

Do not doubt your own thoughts, you could very well be correct.

[emmasweeny]

But this is exactly what I've done. I replaced the main ignition contacts opposite the key but there's another three pair on the key side to various contacts and my original questions is what they do so I can check that they're doing what they are supposed to.