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I have a 1999 Oldsmobile 88, and the low beams aren't working. hi-beams and tail lights work. One low-beam went out, and when they went to change the bulbs, the second one also went out.
I checked the car manual and it says there is no fuse for the headlights, so I have no idea what to do.


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contributions: 1957
Images: 37
Location: Oregon
so, did you verify that they have power and ground at the connector?

both low beams run from one low beam circuit. they don't have different power supplies. They should both have power or there is a break in the wiring if one is on and the other is not.

you do have a headlamp relay in the dash fuse block and the power for the lights comes from the headlight circuit breaker on the under hood fuse block.

the way it works is the headlight switch sends a signal to the light module that is in the center of the dash. It send a signal to the headlight relay. the relay sends the signal to the low/high beam dimmer switch.and then it goes to the headlight bulbs.

have someone turn the low beams on and off and see if the low beam relay is clicking. The relay should have numbered contacts if you look at it from the bottom. (relay removed from the fuse block and looking at the bottom where the terminals stick out from. make sure you have battery voltage and the hole where pin 30 goes into. That is the power from the circuit breaker and is power for the headlight bulbs. When the relay works normally, it takes the power from terminal 30 and sends it out on terminal 87. 87 it the terminal that goes to the high/low dimmer switch.

do you know how to go through and check the whole circuit? (and have the tools to follow powers and grounds to see what you are missing at the headlight sockets?


   
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Thank you for your response. I don't know how to do what youbdescribed, but I will pass this information on to my mechanic and hopefully it will help him figure it out.
I'm also having a problem with my malfunction switch (it's not letting me click the brights on, and seems loose). I'm having that repaired as well.


   
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contributions: 1957
Images: 37
Location: Oregon
the headlight dimmer switch (high / low beam switch) is on the steering column and is adjustable. After time the bolts may come loose and the dimmer switch moves away from the handle. Loosen the two bolts that hold the dimmer switch and move it towards the handle until you can make it click between the low and high beam and tighten the bolts back up. Don't over tighten and strip them out though.

see the two long slots where the bolts go through. that's the adjustment part.


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