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im having a problem with my 2012 chevy malibu yesterday i was upgrading the radio to a touch screen when i connected the harness the gauges starts flashing and abs and the check engine light were on and when i disconnect the harness the gauges return to normal
 

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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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You ended up putting power to a circuit for the IPC (instrument panel cluster).

You probably need 2 power sources for your new HU (head unit), and they should have nothing to do with the IPC.

You'll want a source that is hot at all times to keep your radio memory alive, and another that turns on with ACC or RUN to tell the radio to turn on when you turn the key.

Seeing that you seem to be registered to a country outside of North America, please take a picture of the car so we can tell if your 2012 is the same as the NA 7th Gen or if it's actually an 8th Gen.
 
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