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horn, cruise, sunroof stopped working

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

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horn, cruise, sunroof stopped working

Post by dhill1725 » Mon Oct 31, 2016 11:05 am

Horn cruise, sunroof stopped working. sometimes we get in the car and car will not even crank. Later on that day it will just start. All fuses are good.

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Re: horn, cruise, sunroof stopped working

Post by JRL » Mon Oct 31, 2016 2:15 pm

Year, model and mileage surely would help here!
2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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Re: horn, cruise, sunroof stopped working

Post by oragex » Mon Oct 31, 2016 7:07 pm

as above, what mileage? seeing a 2001 in your signature may imply 130k+ mileage. check in the first place the pulleys on the serpentine belt - alternator, tensioner and a/c compressor ones. Then measure the alternator is charging properly and inspect the power cable nearby. Alternator not charging well will cause the battery to wear. If all checks fine, I would suspect the battery got weak.

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Re: horn, cruise, sunroof stopped working

Post by vtl » Tue Nov 01, 2016 8:14 am

Fix alarm siren, they all develop a leak in battery, which dissolves circuit board underneath. Or at least have it removed from the car. Don't buy a used siren, they all leak. Either buy a new one or fix yours. That will fix your sunroof, which sits on the same computer bus as alarm siren does. Also the car is trying to charge malfunctioning siren battery, which can drain the main battery just over one night.

No crank on earlier models is often a bad starter solenoid contact. There's a small wire attached to starer, remove it, clean all contacting surfaces with contact cleaner, make sure car is able to start (i.e. the contact is reliable), then put some dielectric grease inside socket to prevent further oxidation.

Worn voltage regulator brushes on alternator is also a suspect, given the age of the car.
05 XC70 260k, 16 XC60 40k, 19 Tundra 1k

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