S70 Power Door Lock Problems

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KeenanMD
Posts: 2
Joined: Sat Apr 23, 2011 2:15 pm
Year and Model: S70, 1999
Location: United States

S70 Power Door Lock Problems

Postby KeenanMD » Sat Apr 23, 2011 2:31 pm

Hey everybody!

I am having a long-standing problem with the power door locks on my 1999 S70 GLT for the past 3 years, both with use of the door switch and the keyfob.

ONLY IN WARM/HOT WEATHER the power door locks, especially the driver's, incompletely lock or unlock. The locking mechanism motor can be heard but they seem "weak" and usually don't fully lock or unlock the door.

I've checked the terminal connections on the locks; the car's battery is new and strong without any other electrical problems in the car. I've lubricated the lock mechanism without any change in performance.

POWER DOOR LOCKS WORK NORMALLY IN COOLER WEATHER including wintertime; I've never had a problem with manually locking/unlocking the doors.

Any ideas? Thanks in advance-

KeenanMD

VolvoTurbo850
Posts: 405
Joined: Tue Apr 27, 2010 4:12 am
Year and Model: 1994 850 (T5)
Location: Toronto, Canada

Re: S70 Power Door Lock Problems

Postby VolvoTurbo850 » Sat Apr 23, 2011 4:52 pm

Move to a place where there is only cold weather :lol: ? Sorry had to say it, forgive me! :roll:

Is this only when you use the keyfob? Manually with key? Or both?

The Fleet

2001 V70 (NA) 2.5
1999 C70 Conv. Turbo 2.3 HPT
1998 S70 Turbo (T5) SE
1994 850 Turbo (T5)
1980 Corvette (Corvolvo)

Previous Possessions: (4) 240's, (1) 740, (9) 850's, (5) 70 Series
Projects on the go: NONE... Yet!

BEJinFbk
Posts: 3117
Joined: Sun Jan 06, 2008 5:32 am
Year and Model: '98 V70 R
Location: Fairbanks, Alaska
Flag: United States of America

Re: S70 Power Door Lock Problems

Postby BEJinFbk » Sat Apr 23, 2011 5:42 pm

Sounds like you need a couple of new latch mecahnisms.
'98 V70 R - Well Equipped for Life Up North... ;)

User avatar
JRL
Posts: 8773
Joined: Tue Nov 22, 2005 9:07 pm
Year and Model: Several
Location: 19333
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Re: S70 Power Door Lock Problems

Postby JRL » Sat Apr 23, 2011 6:19 pm

You need a new lock/actuator assy (as many that are bad)
Common failure
You can also buy used assys.
2000 V70R Black, 129,000 miles (Wife's R, getting up there, she won't sell it)!
2007 XC70 White/Oak over 100K perfect. New DD, sold the 06
2000 V70R Silver, 36,200 miles!!! SOLD (I will regret this)!

Contact info for purchases: jrl1194 (at) aol (dot) com

KeenanMD
Posts: 2
Joined: Sat Apr 23, 2011 2:15 pm
Year and Model: S70, 1999
Location: United States

Re: S70 Power Door Lock Problems

Postby KeenanMD » Wed Jun 08, 2011 12:14 am

Thanks for the replies-

Doors always lock/unlock manually; during warm/hot weather the power mechanisms don't work with either the keyfob or the armrest lock switch.

The power windows always work fine suggesting it is not a grounding problem.

I understand the actuator assembly is a common failure but why would it be variable with change in temperature?

Thanks for any other ideas!

KeenanMD

BEJinFbk
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Joined: Sun Jan 06, 2008 5:32 am
Year and Model: '98 V70 R
Location: Fairbanks, Alaska
Flag: United States of America

Re: S70 Power Door Lock Problems

Postby BEJinFbk » Wed Jun 08, 2011 6:56 pm

Physics 101 - Expansion and contraction.
'98 V70 R - Well Equipped for Life Up North... ;)

turbozutek
Posts: 156
Joined: Thu Apr 14, 2011 12:11 pm
Year and Model: 1995 850 GLE
Location: Glasgow

Re: S70 Power Door Lock Problems

Postby turbozutek » Sun Jun 12, 2011 4:44 pm

If the locks don't look likely (or even do this before checking the locks as it's the work of just a few minutes):

Wait till it's hot and problem is apparent. Remove central locking controller module from CEM; throw it in fridge.

20 mins later, sling it back into the car and try locking it. It if helps, suspect dry joints on the unit PCB or burnt contacts on the relay. One of the failure modes of a dry joint is current limitation - which sounds like your 'low power' door locks.

I had a similar problem on a Volvo 480 Turbo a few years ago (of course it only showed up after I'd installed a remote alarm, causing me to spend hours double checking work!).

homerh
Posts: 30
Joined: Thu Jul 26, 2007 10:35 pm
Year and Model:
Location:

Re: S70 Power Door Lock Problems

Postby homerh » Sun Jul 31, 2011 10:44 pm

turbozutek wrote:If the locks don't look likely (or even do this before checking the locks as it's the work of just a few minutes):

Wait till it's hot and problem is apparent. Remove central locking controller module from CEM; throw it in fridge.

20 mins later, sling it back into the car and try locking it. It if helps, suspect dry joints on the unit PCB or burnt contacts on the relay. One of the failure modes of a dry joint is current limitation - which sounds like your 'low power' door locks.

I had a similar problem on a Volvo 480 Turbo a few years ago (of course it only showed up after I'd installed a remote alarm, causing me to spend hours double checking work!).


What do you mean by a "dry joint"? Is there a way to fix this or does the module need to be replaced if it's bad?

Ozark Lee
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Re: S70 Power Door Lock Problems

Postby Ozark Lee » Mon Aug 01, 2011 8:48 pm

The term "dry joint" is common parlance for a broken or faulty solder joint. They typically get intermittent or temperature sensitive as they fail.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
Previous:
'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

homerh
Posts: 30
Joined: Thu Jul 26, 2007 10:35 pm
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Re: S70 Power Door Lock Problems

Postby homerh » Thu Aug 04, 2011 1:34 am

Can anybody recommend a source for a refurbished Central Locking Control Module?


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