headlight motor issues
Discussion
I got my “85” 280i about 2 years ago and the headlights have never moved electrically, they always have mechanically. Once removed and hooked up to a +/- they spin fine. My assumption is that ½ of a revolution is up and ½ a revolution is down.
LIGHTS ONLY
LEFT:
Triple Plug:
Black (GROUND)
Purple and Blue (NOTHING)
Purple and Red (give a + when lights are ON BRIGHT)
RIGHT:
Triple Plug:
Black (GROUND)
Blue and White (NOTHING)
Blue and Red (give a + when lights are ON BRIGHT)
MOTORS ONLY:
On the LEFT side:
(2) White and Purple in a single plug that give a + when lights are ON
(2) White and Yellows in a single plug that give a + when lights are OFF
Triple Pulg:
Black (Ground)
Purple and Blue (Nothing)
Purple and Red (Nothing)
On the RIGHT side:
(1) White and Purple in a single plug that give a + when lights are ON
(1) White and Yellows in a single plug that give a + when lights are OFF
Triple Pulg:
Black (Ground)
Purple and Blue (Nothing)
Purple and Red (Nothing)
All fueses and relays are good.
Any ideas on what’s wrong?
LIGHTS ONLY
LEFT:
Triple Plug:
Black (GROUND)
Purple and Blue (NOTHING)
Purple and Red (give a + when lights are ON BRIGHT)
RIGHT:
Triple Plug:
Black (GROUND)
Blue and White (NOTHING)
Blue and Red (give a + when lights are ON BRIGHT)
MOTORS ONLY:
On the LEFT side:
(2) White and Purple in a single plug that give a + when lights are ON
(2) White and Yellows in a single plug that give a + when lights are OFF
Triple Pulg:
Black (Ground)
Purple and Blue (Nothing)
Purple and Red (Nothing)
On the RIGHT side:
(1) White and Purple in a single plug that give a + when lights are ON
(1) White and Yellows in a single plug that give a + when lights are OFF
Triple Pulg:
Black (Ground)
Purple and Blue (Nothing)
Purple and Red (Nothing)
All fueses and relays are good.
Any ideas on what’s wrong?
Edited by tr7andtvr on Saturday 31st January 18:44
Hi I don't know if the 280i is similar to the 350, but I wonder if its a relay problem, I was plagued by a similar problem when I got mine, it turned out to be an intermittenly sticking relay. I shall attempt an explanation in my electrically simplpe way...
You say you have voltages on some wires, have you tried with the headlamps connected and turning them on/ off. If the bulbs light, and the beams flash then I think it would be safe to eliminate the switch and the headlamp relay.
On the 350 diagram there are 2 fuses, one for left headlamp motor, one for right, i would check these first. Then there are 3 relays, a headlamp motor control relay, and a left and right motor relay. If both are not raising I would try swapping the motor control relay with another one.
I'm sure an expert will be along later...
You say you have voltages on some wires, have you tried with the headlamps connected and turning them on/ off. If the bulbs light, and the beams flash then I think it would be safe to eliminate the switch and the headlamp relay.
On the 350 diagram there are 2 fuses, one for left headlamp motor, one for right, i would check these first. Then there are 3 relays, a headlamp motor control relay, and a left and right motor relay. If both are not raising I would try swapping the motor control relay with another one.
I'm sure an expert will be along later...
these motors always turn in 1 direction (not 1/2 revolution up-down) also in a TR7 or all other brands of cars these motors where used.
you should find what you need here:
http://www.tvrwedgepages.co.uk/maint_headlight.htm...
you should find what you need here:
http://www.tvrwedgepages.co.uk/maint_headlight.htm...
Comadis said:
these motors always turn in 1 direction (not 1/2 revolution up-down) also in a TR7 or all other brands of cars these motors where used.
you should find what you need here:
http://www.tvrwedgepages.co.uk/maint_headlight.htm...
I've revised the circuit diagrams on there in light of Andy's issues; they show a more complete view of the circuit so may assist in understanding what goes on you should find what you need here:
http://www.tvrwedgepages.co.uk/maint_headlight.htm...
Hi Andy,
Looking it Ian's rather nice new schematics if the white / yellow connection from the Headlamp motor control relay is broken this would prevent both pod's from lowering, this seems to be the only common connection between the two pods. If the connection checks out it it could be possible that you have damaged the diode's in the pod motor switches.
Looking it Ian's rather nice new schematics if the white / yellow connection from the Headlamp motor control relay is broken this would prevent both pod's from lowering, this seems to be the only common connection between the two pods. If the connection checks out it it could be possible that you have damaged the diode's in the pod motor switches.
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