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'07 S60R CAN Communication Issues after Battery Disconnect

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seventy1
Posts: 17
Joined: Tue Nov 02, 2010 6:55 am
Year and Model: 07 S60 R; 02 T5
Location: Plymouth, MI

'07 S60R CAN Communication Issues after Battery Disconnect

Post by seventy1 »

I was doing some diagnostics on the SRS module and disconnected the battery before I messed with the SRS connector. I shorted the battery Pos cable to the Neg cable to discharge module capacitors. First time I've done this, but I've read here and elsewhere that it's advisable to protect modules - now I'm not so sure. After I was done and reconnected the battery (Pos 1st, Neg 2nd), the CEM is setting lost comm faults with the DDM and UEM (CEM-1A52 and CEM-1A5C). The driver door window controls are inop, but other doors work, overhead lights, sunroof, door locks, remote all inop. All fuses check ok.

I've tried disconnecting the battery, wait, reconnect in key position II, try remote fob, etc. as VIDA instructed, but the DDM and UEM don't want to come back on line. I always disconnected the Neg terminal first and reconnected last. I haven't tried shorting the battery cables together again, a bit afraid of that now. I've tried searching MVS and other forums for similar problems but didn't find much. Any advice out there? Thanks!

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2007 S60R M66
2002 S60 T5 A
User avatar
seventy1
Posts: 17
Joined: Tue Nov 02, 2010 6:55 am
Year and Model: 07 S60 R; 02 T5
Location: Plymouth, MI

Re: '07 S60R CAN Communication Issues after Battery Disconnect

Post by seventy1 »

Ok, no responses yet..., I did find a recommendation to disconnect the battery cables from the battery and short them together for 10 minutes. Then ignition in PosII, connect Neg first, then Pos. I've always done Neg last, not sure why it would matter. I'll give it a try unless someone has a better idea.
2007 S60R M66
2002 S60 T5 A
ADent
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Joined: Wed Jul 08, 2009 8:33 pm
Year and Model: 2001 V70 T5M
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Re: '07 S60R CAN Communication Issues after Battery Disconnect

Post by ADent »

Looks like official policy is 10 min disconnect, Position II, Positive 1st, then Negative - at least in the online owners manual.

I see some folks say 30 min, then short the cables for a bit, then Pos II, Pos, Neg.

There's other oddball reports of having to jump start after a new battery to get things going ( viewtopic.php?t=21466#p246486 ).

It is weird that the power windows are split (ie some work, some don't) - seems to rule out fuses or relays.
2001 V70 T5M
1988 740 GLE 5.0
User avatar
seventy1
Posts: 17
Joined: Tue Nov 02, 2010 6:55 am
Year and Model: 07 S60 R; 02 T5
Location: Plymouth, MI

Re: '07 S60R CAN Communication Issues after Battery Disconnect

Post by seventy1 »

I tried shorting them for about an hour, reconnected in Pos II, Neg cable first, but it didn't appear to help. I haven't been back in with VIDA, but the interior lights and remote are still out.
2007 S60R M66
2002 S60 T5 A
User avatar
seventy1
Posts: 17
Joined: Tue Nov 02, 2010 6:55 am
Year and Model: 07 S60 R; 02 T5
Location: Plymouth, MI

Re: '07 S60R CAN Communication Issues after Battery Disconnect

Post by seventy1 »

Resolved - I always try to close out my help requests, even when it's a problem I caused. I looked at the wiring diagram and saw that all three no-comm modules (SRS, UEM and DDM) were on low speed CAN. So, I started troubleshooting the CAN circuit starting with the SRS connector that I had disassembled and aha - found that I didn't put it back together correctly. It wasn't a problem with the battery disconnect/connect procedure, but with the repair guy. What's best is that replacing the SRS module with another from XemodeX finally fixed my passenger airbag fault (OWS missing signal codes) that I've been trying to fix for 3 years!
2007 S60R M66
2002 S60 T5 A
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