Hii have a Kenwood KDC-355U head unit for my car and for some reason the remote wire that turns the amplifier on and off is not getting any power. any ideas on what can be the problem

The Kenwood KDC-355U display will read Protect if the receiver detects a short. Check all of the wiring between the unit and the speakers. If you find a loose wire or a spot where a bare wire is touching part of the car (or another bare wire), secure the wire and use electrical tape to insulate the bare wires as needed.

If these steps don't work, then the short is inside the receiver. The unit will need to be repaired. Kenwood has the documentation for the KDC-355U here: https://www.kenwood.com/cs/ce/index.php?model=KDC-355U&lang=index . The direct link to the manual is http://manual.kenwood.com/files/52d601ce30916.pdf .

I hope this helps.

Cindy Wells

check the fuse in the back of the radio

remove from dash and check all connections are okay.

hi, seeing that your kenwood showed up "protect" you may have an audio circuit/amplifier fault within the unit. try resetting the unit to see if unit comes "on" again. if the unit comes on and protect flashes again, then you definitely have an internal audio circuit fault. if not then check all power connections(yellow and red wire voltages, as well as ground connection), as well as the condition of the face pins!

hi robert, attach your remote wire from the amplifier to the blue/white striped wire of the harness of your kenwood unit. the wire should be labelled "p.cont". cheers!

Are you using an amplifier? If you are, it sounds like you are using the blue wire (power antenna remote turn on) instead of the blue/white wire (amplifier remote turn on). The blue wire turns off when leaving tuner mode, thus turning off the amplifier.

There are dedicated terminals / connection points for "remote" input and output on both the amplifier and head unit. This info usually figures prominently in the manuals of both products. Without knowing the which brand and model head unit and amplifier you have, the info may be incorrect. In the past, many head units made use of Blue or Blue/ White for a remote signal. It was used to control an external amp or automatic antenna. An example is the image below of the wiring of a Kenwood KDC-3011 head unit:



Check your manuals (or Google model numbers) to find yours.

Good luck!

Are you sure there is not a blue/white wire on the harness? The blue/white wire is amplifier remote turn on.

Amplifier remote turn on is blue/white, power antenna remote turn on is blue. The power antenna remote turn on turns off when leaving tuner mode.

This is a common mistake. This problem indicates that you are using the solid blue wire from the head unit to the remote turn-on on the amp. This is a power antenna wire that only receives power when on FM radio. You need to replace this with the Blue & White wire from the head unit (power control wire) to your remote turn-on on your amp. This should solve your issue.

Assuming that the four speakers are connected to the amplifier, then the amp is the most likely problem component. Does the amplifier show a power light when the system is turned on? Note that there is probably another fuse in the amplifier power wire, near the battery.