1990 Volvo DL Sedan Brake Lites Work but Also Come on With Running Lites
The center brake light on the rear package shelf and the left and right brake lights do work when I push on the brake pedal. However when I turn on the running lights (also known as the parking lites) or the headlites the center the left and right brake lights come on with the running lites and headlites. I carefully checked the bulb filaments and type and the filaments are fine and bulbs have the correct number - 1157.
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Re: 1990 Volvo DL Sedan Brake Lites Work but Also Come on...
Is there a switch on the left side of the dash that has a red lens and a wavy line across it? If so, you have a rear fog light switch and it has been activated, causing your brake lights to come on each time you turn your headlights on. Flip the switch and the rear lights should display only the parking lights with the headlights on.
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Yes there is a lamp sensor that is between the brake light switch and the rear lamps. If you have a center light it is connected directly to the brake switch and bypasses the sensor. I would check for voltage in and out of the brake switch - if you have voltage out you may have a problem with that sensor.
Brake booster is a vacuum device connected to the intake manifold. Pressing the brake pedal briefly changes the conditions in the manifold and is likely to affect engine idle speed.
A test lamp is more use than a voltmeter for those types of checks because it is low impedance and therefore draws a more useful amount of current which tends to test connections and provides a quick positive result.
The two wires from the brake light switch - one should be at battery potential and when connected to the other directly or via the stop lamp switch that supply should appear at the rear of the car when tested against an independent ground. If ok the fault is with the lamps, bulbs, connections or lamp grounds and if not ok the fault is the cable between the switch and the rear of the car.
It is important to ensure the bulbs are good by testing them independently. It isn't unknown for both to fail at the same time. The 380 and 382 bulb has internal fusing and can fail and still appear to be ok.
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
With all of the lighting circuits going through the Lamp Outage Module (LOM) I
think replacing all the bulbs and insuring that they are the correct bulbs
would be a good first step. If the problem still occurs, then I would
have to suspect a bad LOM and a replacement would be needed. You can get a new one from a dealer or possibly a salvage yard near you by checking www.car-parts.com.
let me know if you have any further questions or need any more help
I can't look up your wiring diagram because I don't know model year?
On some makes and models, the lower brake lites are wired through the multifunction switch. Your turn and stop use the same bulb filament, just not at the same time. On a left turn, the left turn signal works, but the brake lite on the left doesn't. Now, the brake lamp on the right does work. The high mount brake lite also will work. The highmount brake lite is usually wired differently than the lower brake lites.
W/o being able to look at wiring diagram, I don't know if my info is applicable on your vehicle? I need model year.