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Bulbs can be shutoff with the switch, but both headlights are stuck in the up position.
- bulbs are stock halogen
- all lights work. Low beams/High beams, turn signals, brake, DRL, interior etc.
- motors do not make a grinding noise but the driver side will “click” once and move approx. 1/8” when the switch is turned to off.
-The headlights rise with no issue, or noises via switch.
- headlights can be lowered/raised manually
- headlights and brackets are currently taken off the vehicle with no obvious visual issues and the rotating arm assembly appear to be in line with the bump stops.
- ground connections along front frame rails have been cleaned.
I have tried the basic fixes from what I found online:
Checked both fuse boxes. Attempted to flash high beams and turn off the switch. Start the car and toggle the switch.
Since both headlights are stuck in the up position and the lights work. This seems like an obvious electrical issue vs. mechanical. However, electrical diag. Is not my strong suit.
looking for any insight or possible fixes!
thanks.
Try leaving high beams on for a minute. I had the same issue and that worked.
thanks, I will give that a try when I put everything back together.
Has the issue come back since then?
UPDATE:
I opened the housing for the gears in the headlight motor since I was there already and everything looks fine. Grease is still in gears and drive.
i ordered a brass gear kit as preventative maintenance, but this doesn’t look like it’s the issue.
Thoughts: Make sure the connector between the headlight motor and the control module connectors are clean and tight. Also, try backing off the manual up down control on the headlight motors. Yes, it would be unusual for both of the connections to be the issue, but there is Murphy's Law.
Sounds like it could be the MFS or the Headlight Door Control Module. The headlight doors close at *OFF* on the switch, it is the only thing active at that position. Here is the schematic.
Keep your hands clear, and lightly tap the control module behind passenger headlight.
If they go down, you have a bad solder joint inside the box. Can be removed and
resoldered, ro about 150.00 for a new module
It is likely either the multi function switch (MFS) or the headlight control module (HCM). You can check the MFS function at the plug going into the HCM. My case the headlights would not turn off or go down. The ground wire going to the HCM was broken.
Thank you for this.
as mentioned, electrical diag. is not my strong suit.
however, it doesn’t appear there’s much involved since we’re only talking about the headlight motors.
I decided to do some tests and everything passed with the 5- pin connector.
I could not get +/- 12V on the (A-B/C-D) 4- post terminals of the HCM with the 5-pin connected.
I decided to take off the HCM and have a look. See attached.
theres a corner that was open on the back of the HCM, and moisture has gotten in there over time.
I decided to order a new one anyway given the current state.
does anyone know if these will need to be programmed via scan tool, or are they plug and play ?
again, thanks for the suggestions.
Originally Posted by Tony Corvette
Sounds like it could be the MFS or the Headlight Door Control Module. The headlight doors close at *OFF* on the switch, it is the only thing active at that position. Here is the schematic.
Headlights won’t go down
