95 850 Cruise control vac pump

bruceb · Post by **bruceb** » 16 Mar 2015, 02:03

been looking into problems with my cruise control not working - located 2 of the 3 wires under the battery tray for the pump loose and not connected - would anyone know the colour sequence to see if I can get the pump powered up?

Post by **abscate** » 16 Mar 2015, 04:49

Welcome Bruce!

By agreement with Volvo we don't host the wiring diagrams here, but shortly one of our gurus will point you to a host site on the web. Sounds like we will have you cruising, shortly.

bruceb · Post by **bruceb** » 16 Mar 2015, 04:54

cruising sounds good then

and thanks for the welcome!

Post by **Ozark Lee** » 16 Mar 2015, 07:16

At the pump:

Pin 1 - White / Black
Pin 2 - Green / Black
Pin 3 - Blue / Black

If the pins aren't numbered on the connector you can get a schematic diagram from this site that has illustrations of the connectors - if you can find them (the pagination is a mess due to the way they were scanned):

http://www.volvowiringdiagrams.com/

...Lee

Post by **northernlights** » 16 Mar 2015, 21:39

bruceb wrote:been looking into problems with my cruise control not working - located 2 of the 3 wires under the battery tray for the pump loose and not connected - would anyone know the colour sequence to see if I can get the pump powered up?

This is from the Volvo book - it tells you how to test the vacuum motor at the fuse box. My car's previous owner had lots of people fussing with brake switches and god knows what else when the problem was a mostly dead vacuum pump. This test is how I figured that out - my resistance numbers were not in spec.

4) Remove all jumper wires from control unit base. Connect
voltmeter between cruise control unit base terminals 3S and 1S. If
battery voltage is not present, check wiring to cruise control unit.
If battery voltage is present, go to next step.

5) Ensure ignition is off. Connect ohmmeter between control
unit base terminals 7T and 7S. Ohmmeter should indicate about 17 ohms
(internal resistance of vacuum motor). Connect ohmmeter between
control unit base terminals 7T and 9S. Ohmmeter should indicate about
100 ohms (internal resistance of regulator). If resistances are not to
specification, take measurements at individual components (vacuum
motor and regulator) to determine whether fault is in component or
wiring. If all measurements are to specification but vacuum system
still leaks, go to next step.

bruceb · Post by **bruceb** » 17 Mar 2015, 01:08

Thanks Lee (y)

took her for a spin and worked first go.

Now ......- with cruise control turned "on" - is there meant to be a indicator light the system is on or nothing at all indicated but for the switch on the stalk located at the on position?

Bruce

Post by **erikv11** » 17 Mar 2015, 03:03

The latter, the only way to know if cruise is on is if the switch is clicked over.

Post by **Ozark Lee** » 17 Mar 2015, 08:10

There is no cruise indicator at all on an 850. They did add a little green CRUISE light to the instrument cluster for the 70 series but there is nothing at all on the 850s - it is just part of the charm I suppose.

...Lee