2004 Crown Vic P71, OBD2 port has no power and no ground, Fuse is good and cigar lighter works. What would be the next thing to check to fix the problem?

SOURCE: Accesory/Aux AC ports not working

I was able to contact a local service man who works on vehicle electrical. He directed me to a fuse box on the left side of the engine compartment specifically the #1 and #4 fuses. He said the fuses will burn and that is a common problem with the aux power ports and their locations. inspecting and replacing the fuses ended up being the fix.

Marvin

• 85242 Answers
• Posted on Oct 16, 2008

SOURCE: The cigar lighter isn't working how do I fix this problem

This is a fuse problem, check the fuse, it will either be marked lighter or power point, the fuse box is to the left of the steering column it has a plastic cover over it, inside the cover the fuses will be marked on a diagram. If the fuse blows again the cigar lighter is shorted, you will have to replace it, most times the lighter element is the problem and not the well it fits into.

SOURCE: auxilary power, electric windows, cigarette lighter and radio not working

Since all fuses are okay, I would start my trace from the fuse box and pick the easiest wire to trace which would probably be the lighter or aux. Check for any breaks in the line or any lose connections. It seems like a harness may be disconnected or cut.

SOURCE: i need a diagram for a 1998 ford crown vic interior fuse box

ITS FUSE #16 AND ITS a 20A FUSE

SOURCE: Toyota Caldina 2001 no power to cigar lighter, radio, clock!

Hi there
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.