1998 Firebird OBD2 Issue

ADFXOzymandias · 09-08-2015, 12:21 PM

I was about to go get emissions tested last month and I plugged in my scanner to make sure I didn't have any lingering codes, and it would not power up. It worked a week or two earlier when I tried it, but it is currently receiving no power. My radio and cigar lighter also no longer have power. I have checked my fuses and none of them are blown. Any idea what this could be?

brcidd · 09-08-2015, 12:24 PM

Did you test the fuses- as in with a multi-meter?- I have seen fuses look good that are bad....chances are real good it is your cigarette lighter fuse....

ADFXOzymandias · 09-08-2015, 12:42 PM

I have not tested them individually, but I have swapped fuses and it did not fix the problem.

ADFXOzymandias · 09-09-2015, 10:58 AM

Tested the fuse box directly, and there are a couple of fuses not receiving any power, while the majority of them are. Could this be as simple as a poor connection to the fuse box?

brcidd · 09-09-2015, 01:30 PM

Could be ignition switch- does radio/wipers circuit work?

Are the non-powered fuses battery hot, or ignition hot? If ignition hot, then ignition switch is in question.

ADFXOzymandias · 09-09-2015, 06:17 PM

I just replaced my ignition switch last week and it didn't fix the problem. I tested each fuse with my key in the accessory position and in the off position and the ones without power had none during both tests.

brcidd · 09-09-2015, 07:21 PM

Did you try the ignition on position? It is different than accessory you know.

ADFXOzymandias · 09-09-2015, 11:25 PM

Yeah my mistake it was the on position.

Blue Bowtie · 09-10-2015, 07:18 AM

The lighter should have power at all times regardless of the ignition switch position. The radio should have clock/reserve power at all times as well, and only the main power is switched by the ignition switch.

ADFXOzymandias · 09-10-2015, 12:30 PM

I have gone and retested the cigar lighter. Regarless of the position of the ignition, the fuse port itself receives no power.

Blue Bowtie · 09-10-2015, 08:16 PM

Do the interior (courtesy) lamps function? If so, the fuse panel is getting power.

It is possible that the bussing on the rear of the fuse panel has failed. I've had that happen on some other vehicles, but not a ThirdGen. You also need to be aware that the power distribution is through the mass of orange wires plugged to a jumper/tap panel on the left of fuse panel/kick panel area, so check those connections carefully as well.

If there is no power to the main CTSY fuse, there are the fusible links to check.

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