There are several threads that addressed these two issues but I did not give clear solutions so I thought I would post what I did to fix these two problems. I purchased a 850 ten days ago and both were not working. This is what I did to solve the problems.

NOTE: If you just have a problem with your cruise control this is probably NOT your problem. The first thing to check is the switch at the brake pedal. Make sure it is making good contact.

CAUTIONS:

• I removed the battery. Just could not see my damaged vacuum tubing without removing it. If you remove the battery, you will need your RADIO CODE before you can use your radio again.
• If you need any information from your trip computer, you need to get it before you disconnect your battery. Once your battery is disconnected your trip computer will be reset.
• DO NOT CUT both of your vacuum tubes at the same time. You may get them crossed and have to re-connect them after they fail to work because you hooked the boost to the cruise line.

TOOLS USED:

• 8mm Socket, 1/4"
• 10mm Socket, 1/4"
• 12mm Socket, 3/8"
• Ratchett, 1/4"
• Ratchett, 3/8"
• Short ratchett extension, 1/4"
• Short ratchett extension, 3/8"
• Socket screw driver, 1/4"
• #25 Torque screw driver (in car kit)
• Standard screw driver (in car kit)
• Razor blade
• Wire cutters or needle nose pliers
  

REPAIR STEPS (the full size versions of these pics are linked on the thumb nails):

1. Disconnect the battery. I was alway taught to disconnect the negitive terminal 1st. Once you have them disconnect it may be a good idea to insulate the battery cables so they don't short out on anything.
2. Remove the battery from the tray. You may have to remove a small bracket that was installed on my battery to stop the battery from sliding around. If the bracket is installed, it simply lifts out and off of the battery tray.
   
3. Once the battery is out, remove the two screws that hold the tray on the frame. Then slide the tray to the left to release the battery tray studs from the finder.
   
   With the battery out, you can see the cruise control unit and the vacuum line that comes off of it. The unit has 1 screw that secures it to the bottom of the battery tray. There is no need to remove it from the tray.
   
4. With the battery tray un-secure, you can clearly see the vacuum tubing and if there are holes in it. Because of the lighting, it was kind of hard for me to see the damage but I felt it and found the damage. Cut away all the damaged tubing (again, do 1 at a time, that way you don't get the lines crossed). Be sure to leave as much of the good tubing as you can, this will help you not to leave yourself short.
   
5. Use some rubber vacuum hose to re-connect the tubing that was damaged. I borrowed from Peter to pay Paul and took some hose from the windshield washing area.
   
6. Once the lines are re-connected I reversed the removal process. Remember that you will have to enter your RADIO CODE if you removed the battery.

Once I got everything back together my cruise control and turbo boost guage worked great. Hope these instructions helped.

 

Thanks for the post.

 

I thought putting the thumbnail pics in the instructions would allow them to be linked to larger photos but I was wrong. Do you think I should edit the instruction with the larger pics or is the thumbnails ok?

 

That should be fine.

 

I vote for making this a sticky in the Resource thread. What do you all think?

I noticed my CC doesn't work on my last road trip (it used to...). Will ck it out when i get a chance.

Thanks rspi!

 

Done.

 

I have a 97 850 GLT, no turbo gauge.

My cruise control is a little lag, it takes about 10 seconds to react.

Once I set a cruise speed, I have to keep on gas pedal for about 10 seconds to see it operates. If I release gas pedal just after set speed, it won't react.

I checked the vac lines and did not find ant crack. I used vacuum hose tape to secure the vacuum line in case.

Any idea where to inspect next?

 

Did you pull the battery and tray and check the tubes under there?

 

Yes, both the tubes around that unit and the one goes along the driver side.

 

Well, my cruise was acting the same way before I found the holes in my tubes. After a week or so it quit working all together so I tracked down the leak. Likely a vacume leak somewhere. Keep trying to find it. Not sure where, but likely somewhere. Maybe an elbow or it could be in your cruise unit.

 

emm, I will check again from inside out.

 

After careful inspection of the cruise control servo and vac lines, no apparent cracks.

However, I found out my brake has some air leak. I press the brake and I can hear it. After several presses, the brake became strong again.

May this be the root cause of cruise control problem?

 

I don't know. Did that fix the problem?

 

Still the same. I rechecked all the cruise vac line using vac pump, all lines are good.

I test again on highway, the gas pedal still needs to be kept for a while to feel the cruise control responds. Some people say it is the brake light switch, I lift the brake using my left foot while test, no difference.

 

Almost give up... I can feel the gas pedal engage when push +, but apparently there are vacuum leak somewhere I cannot find.

 

Hi,
I just installed a used cruise control in my 1994 850 GLE. However, it does not work. After a road test, and engine still running, code 1-1-1 is read from #2 in the B diagnostic box (no fault). As all hoses looked fine before installation, what I am saying is that there may be something else wrong in stojakovic's (and my) case. The steering switch tests/seems to be OK. The switch that goes on the brake pedal does not fit tightly (it never really 'clicked' into place when installing)...wonder if that is a problem? Look forward to seeing what all you readers think. Thanks.

 

hey i know that ur boost guage and ur cruise control runs on vacuum pressure if both are not working chances are u have a vacuum leak check ur vacuum lines that run to ur intake manifold.

 

Hi
Newbie here ! I Have a '98 V70 tdi with recently failed cruise control. Is this likely to be the same problem with the vac tubing ? Is it in the same place on V70 ?
Strangely, just before the c/c stopped working, I had an intermittent ABS warning light appear, which now comes on some days, not others ... does anyone know if these faults maybe connected ?
Thanks
Frenchman

 

Is yours a european version with the electronic throttle body?

 

Hi Tech ( sorry for the pun )

Well its a UK RHD 1998 model certainly, with OBD-I.

Sorry to be dumb, but I don't know about the electronic throttle ... if you can tell me what I'm looking for, I'll go look ... Thanks from a limey buried in deepest france !