No power to driver side door controls

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Old 01-20-20, 04:02 PM
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Unhappy No power to driver side door controls

Everything worked fine yesterday. It is a 2008 Buick Lucerne. Upon starting the car this morning, there was no power to any of the controls on the driver side door. Could not open window. Could not adjust mirror. Could not lock doors. Could not turn on the heated seat. Key fob will lock the other 3 doors, but not the driver side door. No dome light comes on when the door is opened. When exiting the car with the radio on (after the car has been shut off) the radio keeps playing. Controls work on all other doors...just not on the driver side. Can someone steer me in the right direction here? Thank you.
 
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Old 01-20-20, 05:01 PM
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My guess is the fuse that provides 12 vdc to the passenger door is open and/or the wire providing 12 vdc to the door switches is broken and/or a connector inside the door has come disconnected.
 
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Old 01-20-20, 05:28 PM
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Was there anything at all working..... or lighting up... on the door when headlights are on ?
You either lost power to the door as mentioned or you lost the BCM data connection to the door.

If you check the fuse for the door and find it not blown there may be a broken wire in the harness thru the door.
 
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Old 01-20-20, 10:46 PM
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There would not be a fuse for the door, the fuses are for systems throughout the vehicle.

There is an electrical connector at the door, on the hinge side, that would be first thing to check. It;s a pretty robust cam locking connector and should never come loose but it sure fits the description of the symptom!
 
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Old 01-21-20, 03:35 PM
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No....not even with the headlights on....nothing worked. With the lights on I could see the little pin lights that were lit up on the passenger side door controls and even both back door controls had pin lights lit up on them. Absolutely nothing on the drivers side door.
As I live in Northern Michigan and the weather is bitter cold right now I have not had the opportunity to start digging into things. Really miss that heated seat about now.
 
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Old 01-21-20, 05:48 PM
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That car uses fully multiplexed data. There is data and 12v power to each door.
Most functions are no longer carried on individual wires but are controlled thru data lines and BCM modules.

There is a fuse for the drivers side door module. It's # 22 in the rear fuse box.
The rear fuse block is located under the rear seat on the driver side.
The rear seat cushion must be removed to access the rear fuse block.

If that fuse is good..... then you need to start checking for broken wiring between the door and the dashboard. If you are not experienced in auto wiring.... this will not be an easy job. The wires are not usually completely broken. Typically the wire is broken inside but the insulation can look completely normal. A wiring diagram for the door will be very helpful.
 
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Old 01-26-20, 11:35 PM
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May be a faulty driver door module. Need good scan tool scan for u codes and capable of doing bi directional controls to control outputs of driver door module. After confining to ddm check power and ground before replacing.
 
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