willischulze19
SM5 power windows dead
Summary of the thread
The power windows on a 2008 Renault SM5 were non-functional, with error codes indicating an issue with the window circuit. Initial suspicion was on the power window switch, but advice suggested checking the wiring harness for breaks, which can cause such failures. After ruling out the harness and considering the absence of motor noise, the regulator was identified as the likely culprit. A professional inspection confirmed the regulator was faulty, leading to its replacement and resolving the issue.
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4 comment(s)
willischulze19 (community.author)
Good shout on the wiring harness, will give that a look-see. Didn't notice any odd sounds from the window motor, but admittedly, I wasn't paying super close attention. If the harness checks out, is it likely the whole regulator needs replacing or could it still be just the switch?
christopherfox1
If the harness is fine and there were no weird noises, then it very well could be just the switch. However, given the stored error code and the complete failure, my suspicion is still on the regulator itself. The switch is an easy check with a multimeter, but honestly, with that mileage, the regulator is a common failure point. Given the hassle of getting to it, you might be best off having a shop check it out.
willischulze19 (community.author)
Cheers for the advice. After checking the harness and finding nothing amiss, I decided to bite the bullet and take it to a local shop. Turns out the regulator was indeed toast. Cost me 200€ for the repair, parts and labor. Annoying, but at least it's sorted.
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RENAULT
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SM5
christopherfox1
Sounds like a faulty regulator, but before you go ripping the door apart, have you checked the wiring harness where it passes from the body to the door? Those wires can fatigue and break over time, leading to intermittent or complete failure. Also, any weird noises from the window motor before it died?