1982 245 Headlight Warning Light
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1982 245 Headlight Warning Light
Hi everyone!
I just purchased a 1982 245. I replaced the low beam lights, and now the warning light comes on when I turn on the headlights, which are working fine. Any suggestions on how to make the light go off?
I just purchased a 1982 245. I replaced the low beam lights, and now the warning light comes on when I turn on the headlights, which are working fine. Any suggestions on how to make the light go off?
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
the bulb out sensor works by detecting any difference in the current between the two sides, it does this with counter-wound coils around a reed relay.
clean all connections in the low beam circuit. make sure both bulbs are the exact same type. make sure both headlights have good ground connections.
on a car that old, as a matter of principle, I would replace all the crappy aluminum/tin fuses with proper copper/brass ceramic european fuses. I get these from ebay, they are sold as 'mercedes W124 fuses' (W124 is a Benz 300E/300D/etc from the 80s/90s), enough to do 2-3 volvos is maybe $15. the ones sold in american autoparts stores are the silver junk ones. clean the spring contacts in the fuse holder with a soft clean rubber pencil eraser.
unluckily, I don't have the 1982 greenbook (wiring diagrams), only 1975-1980 and 1984 on.
looking at a 1980, the headlights aren't fused, the only connectors shown are near the headlights. On an 84, which has the quad headlights, same thing, no fuses...
the headlight low beam power goes into the bulb failure warning sensor on pin 6 (green) and comes out on pin 2 (blue, left side) and pin 7 (also blue, right side light). this failure sensor is buried under the dash on the drivers side, and looks something like a frozen OJ can, with a round connector on the rear-facing side. the ones I've seen have all been red-orange, but they are from newer cars.
the headlights are grounded at the front of each fender, right next to them. if either of these grounds is a bit resistive, that will light the failure light as the current will be unequal.
if all this doesn't help, remove the stupid warning bulb from the dashboard, nothing will be harmed
clean all connections in the low beam circuit. make sure both bulbs are the exact same type. make sure both headlights have good ground connections.
on a car that old, as a matter of principle, I would replace all the crappy aluminum/tin fuses with proper copper/brass ceramic european fuses. I get these from ebay, they are sold as 'mercedes W124 fuses' (W124 is a Benz 300E/300D/etc from the 80s/90s), enough to do 2-3 volvos is maybe $15. the ones sold in american autoparts stores are the silver junk ones. clean the spring contacts in the fuse holder with a soft clean rubber pencil eraser.
unluckily, I don't have the 1982 greenbook (wiring diagrams), only 1975-1980 and 1984 on.
looking at a 1980, the headlights aren't fused, the only connectors shown are near the headlights. On an 84, which has the quad headlights, same thing, no fuses...
the headlight low beam power goes into the bulb failure warning sensor on pin 6 (green) and comes out on pin 2 (blue, left side) and pin 7 (also blue, right side light). this failure sensor is buried under the dash on the drivers side, and looks something like a frozen OJ can, with a round connector on the rear-facing side. the ones I've seen have all been red-orange, but they are from newer cars.
the headlights are grounded at the front of each fender, right next to them. if either of these grounds is a bit resistive, that will light the failure light as the current will be unequal.
if all this doesn't help, remove the stupid warning bulb from the dashboard, nothing will be harmed
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
well, that would do it! as I said, its the difference in current between the two sides that triggers the light. high beams aren't checked, just low beams, parking, and brake lights.
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