Question about 2001 Pontiac Grand Am SE

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Ignition Switch Wiring

Why does the radio only work in the "On" position and not in the "Acc" position? How can i change it?

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I have a 99 grand am and it doesent do that....bad switch maybe

Posted on Nov 27, 2008

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What is confusing is, lights will work without the switch. You should be able to turn lights on without the key in the ignition. But a radio normally needs the ignition turned to ACC (accessory) or ON. And some when left on don't turn off with the key off until the door is opened.

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If it was the front dash mounted lighter socket you used, the correct fuse is the 15A CIG & RADIO fuse (at the end of the second row) of the dash fusebox. If replacing the fuse hasn't fixed it, you may need to look closer at the wiring from the fusebox as it's likely the wiring has gone open circuit.
Take the fuse out and check for voltage at the terminals in the fusebox with the ingition key turned to the ACC position. One terminal or the other will have 12V on it. If no voltage on either you have a fusebox to ignition key wiring problem. Check for voltage on the ACC pin of the ignition switch, with the key turned to the ACC position. That's pin 3, a blue wire, of the 8 pin ignition switch connector. If still no volatge the switch is likely faulty. the voltage into the switch must be there as it also feeds the ECU and IGN systems, so the car wouldn't run at all if it wasn't.

There is another possibility. If you have an alarm system, immobilizer or turbo timer (assuming the GTT model) these devices could be interrupting the power lines and be the culprit devices.

I assume it wasn't the rear hatch area lighter socket you used, because the fuse for that doesn't power the radio or clock. The fuse for that socket is the 15A ACCESSORY fuse in the passenger side footwell fuse panel.

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