Head unit not working

[PrOxIMPURE]

I guess check the other fuses, or measure the voltage on the supply pins at the radio head unit connectors with a multimeter when the accessory power is on.
Edit: some headunits have a fuse on the back of them, perhaps check those as well. Once you find the problem, then it will be easier to fix and prevent from reoccurring.

From the diagram below, looks like you'll want to check the voltage on pins 7 & 8 on the black connector.

Attachment 5923

Just received the multimeter and checked pins 7&8 and there is no power going through at all when car is on and off. What would this mean and does anyone know how to fix this?

Thanks

[pinchies]

Just received the multimeter and checked pins 7&8 and there is no power going through at all when car is on and off. What would this mean and does anyone know how to fix this?

Thanks

For a start, it means that the head units are probably ok. Bad news is that it's time for everyone's favourite game... Checking fuses. Check #10, #37 and #42 (most likely but you already replaced it).

[PrOxIMPURE]

For a start, it means that the head units are probably ok. Bad news is that it's time for everyone's favourite game... Checking fuses. Check #10, #37 and #42 (most likely but you already replaced it).

Just cheeked fuses 10, 37 and 42 which are all fine. Any other ideas or suggestions?

[pinchies]

Ok, so the next thing to do is to check there is power getting to those fuses, and then tracing along till you find where the problem is. On the car, the metal body is grounded to the negative battery terminal, so you can measure the voltage at any point with the multimeter. Set the multimeter to voltage, and touch one end of the probe to the car shell, and one end to the fuse you are trying to measure. Check the voltages on each of the three fuses listed, and see what you get. If the reading is zero volts on the 42 fuse then the problem is probably between the fuse box and the battery. If it is 12v, the the problem is between fuse and audio area.

[tek199]

Check if you are using the oem adapter cable from the iso connector. My alpine unit was using a different adapter cable.

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