Mercedes ml 280 4matic 08 plate

Hi guys, today my heaters & a.c. have stopped working out of the blue. I noticed yesterday that when I opened the car, the heaters were blowing but without the key in the ignition. Any ideas what is the issue with it? I'm not sure if it's an electrical fault as my back right hand break light stays on constantly, when the bulb is connected. I've only had the car a couple of months & still under warranty from the private garage I brought it from.

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MBFanatic made a comment.
1 year 4 months ago

That problem may be caused by a defective Signal Acquisition Module. Have the garage scan the codes from the heating and AC control unit. 

 
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Davinia Whu Chalkley made a comment.
1 year 4 months ago

Thank you. I shall let you know the outcome ?

 

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