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headlights will go down but not up by vizzionn
Started on: 10-04-2014 01:52 PM
Replies: 5 (243 views)
Last post by: theogre on 10-05-2014 05:27 PM
vizzionn
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Report this Post10-04-2014 01:52 PM Click Here to See the Profile for vizzionnSend a Private Message to vizzionnEdit/Delete MessageReply w/QuoteDirect Link to This Post
as the title says they will go down but not up ive replaced the passenger side motor with a new reman motor the other motor i rplaced the torque pins and a new cog . What im wondering is could the relay for them be bad not letting enough power to the motor to raise them up or is it something else? Its a 88 that i have so its the gen 2 headlight system,

[This message has been edited by vizzionn (edited 10-04-2014).]

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gtoformula
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Report this Post10-04-2014 02:47 PM Click Here to See the Profile for gtoformulaClick Here to Email gtoformulaSend a Private Message to gtoformulaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Below is a link to the Ogre's Cave. You will find a link to the Ogre's Cave on the top line display of this page. He had captured many step-by-step diagnosis/repair procedures including the dreaded Fiero headlights. You can use a factory manual, but the Ogre's write-ups are very easy to follow. My bet would be that you need a headlight module. The 84-86 headlight systems used several relays, but he 87-88 systems mostly rely on the module.
http://home.comcast.net/~fierocave/hlmotor.htm
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theogre
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Report this Post10-04-2014 06:38 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have more data for that page but update is not finished.

module maybe.
Poor Power or grounds. See my Cave, Electric Motors

Could be Module is 100% and shutting down when motors bind for any reason.
Going up takes more power to start with. (Why? Long story, short on time.)
A lack of lube, Bushings dying and crap is contaminating the gears, etc, can cause the module to shut down.

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)


The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

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lateFormula
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Report this Post10-04-2014 08:19 PM Click Here to See the Profile for lateFormulaSend a Private Message to lateFormulaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Do your headlights go up and down OK if the hood is open and the mechanisms are getting no resistance from the headlight doors? if this is true then here are a couple suggestions:

1) Put a couple drops of 3-in-1 oil on the pivot bolts that the headlight mechanisms rotate about when going up or down. In addition to this:
2) The headlight doors have a couple rub pads that the headlight mechanism is in contact with to push the headlight doors open. Open your hood with the headlights down and spray these rub strips with a couple heavy coats of silicone spray.

Providing this lubrication will reduce the effort that motors need to raise the headlights, and could solve the problem.
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vizzionn
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Report this Post10-04-2014 10:31 PM Click Here to See the Profile for vizzionnSend a Private Message to vizzionnEdit/Delete MessageReply w/QuoteDirect Link to This Post
thanks for the info ill look at the info on ogres site and ive had the hood up and the headlights still wont go up . Ill try lubing the parts that was mentioned and see if that will work when i replaced the motor on the passengers side and i should have mentioned this too they went up like 4 times then the next day they wouldnt go up
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theogre
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Report this Post10-05-2014 05:27 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by lateFormula:
Do your headlights go up and down OK if the hood is open and the mechanisms are getting no resistance from the headlight doors? if this is true then here are a couple suggestions:

1) Put a couple drops of 3-in-1 oil on the pivot bolts that the headlight mechanisms rotate about when going up or down. In addition to this:
2) The headlight doors have a couple rub pads that the headlight mechanism is in contact with to push the headlight doors open. Open your hood with the headlights down and spray these rub strips with a couple heavy coats of silicone spray.

In short term maybe... long term most lube will:
Trap dirt etc and "wick" crap into pivot points.
Most HL pivot point and door sliders use Plastic bearings. Most oils/grease will kill them. (Brake/clutch pedal bushing have same issue.)

GM used dry plastic bearings so dirt etc won't build up and do damage that can kill HL lift system.

WORSE... Likely Won't do anything to gen 2 system.
Most likely Module is:
killing power as soon as HL switch is on. Cause by dead bushing, motor need lube, etc.
or
dead gear "bushing" can hold a load sometimes, other time motor just spin for ~5 sec then module times out.

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