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cruise control not working

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

cruise control not working

Postby scottg » 26 Feb 2012, 18:46

I have a '93 850 GLT and the cruise does not work. I have replaced the brake vacuum cut-off switch, the control module, the switch tree and still nothing. I don't even hear the vacuum pump working. I did run some tests and could make the vacuum pump work with jumper wires placed on the posts under the control module, but it doesn't seem to come on when needed. The other tests I've run showed the "-" side of the selector switch was bad, ergo its replacement. The brake cut-off switch I had to replaced because I broke it messing around under the dash. I am pretty sure it is adjusted correctly. The only code I get from the diagnostics is a 1-2-2, no speed detected (or sometihg like that).
Any ideas? When should the vacuum pump come on?
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Re: cruise control not working

Postby rspi » 26 Feb 2012, 19:54

Go for the simple stuff first. Check vacuum lines, mine were worn through under the battery box. Then I had a linkage broke at my gas pedal (from the servo pump).

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Re: cruise control not working

Postby Ozark Lee » 29 Feb 2012, 05:19

Most of the time the hard plastic line from the vacuum pump to the firewall is cracked. Have you installed the jumper wires into the cruise relay sockets to verify that the pump itself is working?

It sounds like you have done all of the DTM-2 tests already.

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Re: cruise control not working

Postby scottg » 02 Mar 2012, 01:41

I have run the jumpers under the control module and the pump starts up jsut fine. I pulled the pump out and inspected the hoses, and all seems fine. When does the vacuum pump start up? When the car runs or when asked to by the cruise?
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Re: cruise control not working

Postby erikv11 » 02 Mar 2012, 02:30

Vacuum pump starts up when the cruise is activated, when you actually set a cruising speed.
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Re: cruise control not working

Postby scottg » 02 Mar 2012, 02:48

Thanks. I NEVER hear the thing running at all and the cruise doesn't even try to engage. I'm getting stumped over this one. New brake cut-off switch, new control unit, new switch tree, still nothing!
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Re: cruise control not working

Postby MadeInJapan » 02 Mar 2012, 23:00

I had the same problem, it was a broken wire right under the switch on the stalk at the steering wheel- it will come apart fairly easily. Look in there- all I did was use a piece of solder and tape and mine worked again.
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Re: cruise control not working

Postby rspi » 03 Mar 2012, 03:22

My linkage between the vacuum servo and the gas pedal was loose.
'95 855 T-5R, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow
ABS Light? - Volvo Repair Videos
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Re: cruise control not working

Postby scottg » 04 Mar 2012, 16:50

I've checked and metered the wiring to the switch and all tested just fine. As I meter the tree switches, all test just fine. The "-" part of the switch tested bad at the point under the control unit which is why I replaced the tree. All fuses are good, but I am nearly convinced it's an electrical problem somewhere, but I don't know where.
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