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Volvo XC70 Electrical/Lighting Issues

19 messages,  Last post on Aug 12, 2009 at 10:20 AM

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What is this discussion about? Volvo XC70, Lights, Electrical, Wagon

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#10 of 19 Re: 2005 XC70 electrical failure [cdonovan] by lmkaufman Jan 24, 2007 (6:32 am)
Replying to: cdonovan (May 04, 2006 7:18 am) I have a 2004 S80 T6 with 35,000 miles and I too have had the exact same problem with my vehicle. I was driving in the early morning about 2 hours into my drive at 55 mph, and I heard a thud. Then the message center reported my left rear door was open, and when I tried to lock the doors, the locks repeatedly bounced. After driving a few more minutes, the interior lights illuminated, then the radio, climate control, gauges, and all lighting failed. I also lost power assist to the steering and the brakes and the car felt like it was lurching. The message center was the only illumination in the vehicle and it continuously popped error messages (ABS, SRS, DTSC, Brakes, etc.). I stopped the car and restarted it immediately and the problem persisted. To date, no on has been able to diagnose the failure cause.   Please note that I have had similar issues on long drives, but never as severe as the one listed.   My big questions are did Volvo ever repair your XC70 and what dealership performed the work? Replies to this message: fjccpi (Aug 03, 2009 4:43 pm)
#11 of 19 Re: Battery discharges:key off and removed overnight [johns5] by jfremeau Jun 03, 2007 (9:07 am)
Replying to: johns5 (Aug 28, 2006 12:51 pm) We have EXACTLY the same problem with fan starting & hot air blowing after engine is turned off -- Did you find a fix?? Replies to this message: lmkaufman (Jul 03, 2007 11:55 am)
#12 of 19 Re: Battery discharges:key off and removed overnight [jfremeau] by lmkaufman Jul 03, 2007 (11:55 am)
Replying to: jfremeau (Jun 03, 2007 9:07 am) After 4 months and 5 Volvo dealers , I found a dealer that agreed with me that the voltage regulator and/or alternator were/was defective. The voltage to the CEM can never drop below 12.5 volts (per Volvo), but the fault in my electrical system allowed the voltage under load to drop momentarily to as low as 11.3 volts. Additionally, the battery was not being properly charged while driving, which led to its premature demise.   Whenever the voltage drops below the minimum bias level, the behavior of the computer system in totally unpredictable. Low voltages will reset the computers preventing any errors codes from being stored (a concept that many dealers refused to accept!). This phenomena accounted for my original breakdown, and even after the CEM and battery were replaced, the vehicle still behaved oddly. The alarm sounded without reason, the door locks would behave erratically etc. Finally, I found a dealer that understood my cars issues, and thanks to a new alternator/voltage regulator, my car is again driveable.   Please be aware that the S80, and I assume the XC70, have an automatic feature that cycles air through the cabin when the car is parked to keep temperatures to a minimal level.
#13 of 19 Re: Battery discharges:key off and removed overnight [johns5] by jfremeau Aug 18, 2007 (5:50 am)
Replying to: johns5 (Aug 28, 2006 12:51 pm) Reply to John, I was just reading your reply regarding the 2001 XC wagon, blowers turning on after ignition key is turned off. Just had my regulator replaced and it did not fix the problem. Have you found a fix for the problem. If so would love to know. Battery was dead, the reparis shop said it was the voltage regulator, but still doing the same thing. I also found that this only happens when I am using the airconditioner.
#14 of 19 light bulbs by dundrln Sep 06, 2008 (3:49 pm)
Have a 04 XC-70 with 75,000 miles. Really no major mech problems. However, we have a summer home situated on a gravel road . I am constantly replacing the light bulbs for the rear brake, signal, license,and tail light . Come on; this is considered a vehicle that can be driven off road. Also, I upgraded to Xenon headlights which are horrilbe. They only extend the beam in a narrow range and less than 25 feet in front, Volvo service said there is nothing that can be done. Replies to this message: kdavidson78 (Jul 28, 2009 6:11 am)
#15 of 19 2001 XC Electrical Failure by mkrenesky Nov 16, 2008 (6:21 am)
Have '01 XC (90,000 miles) that the electrical went out and the dealer says nothing is wrong. What happened: Was driving on highway and slammed on breaks to avoid accident ahead. First, the radio turned itself on-off, lost turn-signal (bulb was burned out). When arriving home, radio would not shutoff. Next day was driving 2-3 miles from home and all electrical went out...except radio! Drove home and had car towed to Volvo. Appeared that when hitting bump in the road everything flickered and went out.   Message center displayed initially that a bulb was out (proven true) and the second time that the ABS was bad.   Volvo initially has said that the computer is bad, but diagnostics shows no errors.   Noticed that there have been other electrical issues posted here. Did anyone ever have the problem resolved?
#16 of 19 Re: light bulbs [dundrln] by kdavidson78 Jul 28, 2009 (6:11 am)
Replying to: dundrln (Sep 06, 2008 3:49 pm) We have the similar problem. Our XC70 is '03 and we're constantly having to replace the low-beam or back tail lights. This is frustrating. When it first started happening we took ours to the dealership, but no firm explaination on why it was doing that. For now we just have to deal with it and simply replace when it happens, but it is frustrating. We've noticed also that when we would have 2 items plugged in the AC adapter that a fuse would blow, I think part of the electrical system (lighting) and the AC adapters are a weak point that needs to be adressed with volvo design dept.
#17 of 19 Re: 2005 XC70 electrical failure [lmkaufman] by fjccpi Aug 03, 2009 (4:43 pm)
Replying to: lmkaufman (Jan 24, 2007 6:32 am) Same problem here - does anyone have a solution?   I have a 2004 XC70 wagon, 80,000 miles It has the same electrical problems described. The car will suddenly ‘buck' for a second as if it stalled or is trying to downshift. I'm pretty sure it is trying to shift. The inside lights will go on, and a ‘left door open' message will appear. Sometimes the dashboard lights and indicators will go out as well. The transmission was flushed by the dealer for the first time at about 70,000 miles. It was dirty at that point according to them. 75,000 mile service was performed, and the software upgrades were done.This was about 6 months ago The problem continued after the service, once the weather got hotter (in New Jersey) One volvo dealer had no idea, another said it was a $ 1,200 + problem: ‘Fault trace to internal fault in DIM P/N 8602763, 8633289' The first item is the dashboard assembly for $900, I can't find any info on the second part. From browsing I have picked up the idea it is the ECU. From other posts, it sounds like I should have the transmission flushed and check for software upgrades. I am not planning to attack this myself. I'm looking for clues to discuss with a mechanic. Has anyone successfully fixed this ??
#18 of 19 xc70 intermittent electrical by dean36 Aug 12, 2009 (10:00 am)
This seems to be very similiar to my 2004 xc70. This only happens after 5-7 hours of highway driving, which is only 2-3 times a year. There is no indication anything is wrong and it does sort of feel like a thud, but is likely the engine momentarily stalling or the AWD system reponding to the electrical problem. The red triangle immediately appears with the messege that the left rear door is ajar, with of course it is not and the interior lights illuminate...because it thinks the door is open. This will occur every 2-5 minutes 2-3 times until the cem shuts down which leaves the vehicle in "limp" mode, driveable, but without many systems. In my case usually if you pull over stop, turn the car off for a couple of minutes and restart all is normal, except for the codes that relate to some of the system failure that have nothing do to with the original cause. the dealer wants to replace the cem, but a good local independant says in 20 years He's only replaced 2 of these and one had obvious extermal damage..they want to start checking the systems one at a time?? Volvo must by this time be aware of the problem and possibly a solution?.....but they're not telling. the previous post about the s80 with the alternator make sence, but it could be anything on the electrical network causing voltage problems....please post any updates Replies to this message: fjccpi (Aug 12, 2009 10:20 am)
#19 of 19 Re: xc70 intermittent electrical [dean36] Seems RESOLVED! by fjccpi Aug 12, 2009 (10:20 am)
Replying to: dean36 (Aug 12, 2009 10:00 am) I found a good independent in Freehold, NJ: Pro Vo Vo. They also thought replacing the CEM would be unusual, but after some extensive testing they did replace it for about $900 total parts & labor. Results after 2 weeks and 500 miles are EXCELLENT. The behaviour both of us experienced is gone. Also, I always felt the transmission was sluggish. This has also cleared up. I would let them change the CEM. This may be a chicken or egg thing with the voltage. A computer chip should not 'wear out' like a moving part, although a defect may take time to appear. I suppose a voltage swing could burn it out or weaken it. For now, I am glad the CEM was replaced. The first dealer said nothing was wrong, the second wanted over $1,200 to replace the instrument panel, but couldn't explain how that would cause the problem. (i declined) I agree Volvo should be more helpful   Keep me posted.

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