check the bulb monator. it will cause this problem
volvodoctor
Test / Replace brake light switch first (small button depressed by the brake lever when brake is NOT pushed - has only two wires). Test by connectung wires to one another and see if brake lights work. If they work, replace the switch. If they still don't work, replace the bulb failure warning sensor. It is a red cylinder with many (12?) wires going in and out in a round pattern on the open side - it isbelow and to the left of the steering column. You have to remove the panel below the steering column. Pop the plugs with a screwdriver to expose the screws beneath.
Reply #9 SS Gravy (99.33.29.234:N-0-0-) - Thu Feb 24 10:47:34 2011
Reply 8 from Sean is probably best place to start. Try the bulb failure warning sensor first because it is easy to get to, above the fuse panel. The brake light switch is a nightmare to get out, you need just the right compact wrench and some yoga lessons. There are 2 switches working off the brake pedal, The long round black plastic (easy to get to) one is your cruise control switch. Attached through the steering column plate above and to the right of CC switch is the full metal break light switch. GOod luck!
probably a bad starter have it checked. This somewhat reminds me of my situation. I have a 960 and often when i start the vehicle the interiors to go on but the gears won't move, the seatbelt light doesn't flash, etc. If i tilt the key in the ignition back, ever so slightly, it will catch and the car's ready to drive. Alternatively, I would say it's a bad starter as I've experienced one of those in a 2001 Taurus and after too many of times of it 'just catching' it completely failed.
A/C condensate?
This is actually a trick question. There is NO High Pressure Port on the Volvo 850 Turbo. Service is done by connecting to the Low Pressure Side and using this access to both Evacuate and Service. Chrysler for a few years did not use a High Pressure Port and required connecting a Scan Tool to the OBDII Connector and taking readings this way but Volvo does not even offer this option. Todd
Left (drivers side) strut tower, bolted to the top
If this is for your volvo pre round 3 test it's 1 amp. 170 ma is .17 amps.
Check wiring for 12v also the brake switch on the brake pedal.
Have the ignition switch checked. As they age they don't make contact intermittently.
your headlamp switch on the dashboard has a small screw on it. its a 3 position switch. turn it to switch daytime running lights off.
you do not adjust the brake lights check the bulbs or check switch top of brake pedal.
u need to replace light switch
I had a similar problem with my S70 and discovered the headlight switch was defective. The switch had actually begun to separate causing the contacts for the tail lights not to make contact. Try having someone observe the tail lights while you push on the headlight switch. If the tail lights begin to work, replace the headlight switch.
In the upper console above the windshield where the two lights are located there is a rocker switch giving the option of On, Off and with Doors.
It could be as simple as bulbs burned out or your switch could be defective.
the ignition switch is bad
bad bulbs and or blown fuse
1998 VOLVO S70 Headlamp Switch
First be sure the bulbs are good then check the switch.