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Clicking sound under dash after PCM replacement

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Recently replaced the PCM with an aftermarket double din radio. Now there is an intermittent clicking that comes from underneath my dash. Everything is working so far (except the steering wheel controls that I haven’t figured out how to hook up yet). Could this be the SWC or is it something more I should worry about? 2006 Cayenne Base 3.2L TIA



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If your new HU has a supplied CANBUS adaptor, they can use different protocols to keep the bus alive when the vehicle is off but the key is still in the ignition. The first adaptor I tried did the same thing, kept clicking a relay in the dash. But the company sent me a new one which worked by a different method I guess and it doesn't click. The fact the SWC don't work also suggests the CANBUS unit is jacked. But the clicking never seemed to be anything but annoying, and you can use mtcdtools or the equivalent for your unit for the buttons if WheelKey doesn't work.

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Thanks. The new HU didn’t come with a CAN-BUS so I ran a hard wire to the fuse box so it will turn on with the ignition. I haven’t hooked up the SWC yet because I’m not quite sure how. There is an additional harness on where the radio hooks up that I assume is where I’ll connect the SWC. Should I get and connect a CAN-BUS adapter??

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Your best bet is to buy the CANBUS decoder from the manufacturer of your HU, assuming the additional harness is for the adaptor. The CANBUS decoder will be specific for decoding your model vehicle, and communication with the HU specific to the HU manufacturer. Just so you know, it might not work perfectly, as the Porsche CANBUS is a bit different than most it seems. But if you don't have a CANBUS now, I don't know what would be causing the clicking...I'd sort that out first and make sure it isn't a current draw, especially if it happens when the car is off and the key is out. ACC switched taps in the fuse box are not easy to find - where did you connect it too? If you just connect the HU ACC line to the power line, does the clicking go away? If so maybe your tap point isn't ideal...

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  • 1 month later...

So I finally connected the SWC and the clicking stopped. I haven’t put in the CANBUS adapter but did figure out that the car was trying to make the connection for the radio controls on the steering wheel which seems to have been causing the clicking. Oh and I also rewired the ignition wire to a different fuse in the box but the clicking actually stopped after installing the SWC harness.

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