No Power to head unit

Hi

Firstly thanks to all for the responce to my last message. It was a great help.

While playing around with my speaker wires the power to the memory wire on the head unit has lost its power (probably due to a short). The ignition one is fine.  I have also noticed that since this my central locking / folding mirrors / interia lights do not work without the ignition key in. I am assuming that the problem is a blown fuse but I cannot seem to locate it. My car is a Chrysler Grand Voyager LE 3.3.

Please can anyone help.

Some of the fuses are near the ignition harness, but there's also a bunch of fuses underneath the hood as well (they're under a black plastic cover).

Also, make sure that if the constant power wire for the stereo has an inline fuse (many do) that you continuity check it to verify that it's not blown.

Hi

I have tried the fuses under the hood but cannot find one that has blown. I have also checked the ones next to the diagnostic port. There is one there that says "Radio" but this is OK. You mentioned an inline fuse to the constant power. Would this also cause the other problems that I have eg. The central locking.