headlamp height adjustment not working - MG-Rover.org Forums
 
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post #1 of 10 (permalink) Old 12-01-2017, 08:36 Thread Starter
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Car: 2002 Rover 75 CDTI tourer, 1999 Rover 400 (1.6) (sold), Metros: 1993 GTI MPI, 1984 1275 and 1989 998
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headlamp height adjustment not working

hello.
the right hand side headlamp on my 75 does not adjust up and down when I turn the switch on the dash and does not adjust up and down when I turn on the ignition ad it used to do. the left hand side one works fine.
I have tried unplugging the plug and inserting it again hoping it was a bad connection but apparently not.

is this a thing that normally goes wrong or what are the experiences regarding this problem?
I tried searching but only found one thread mentioning that the wires could be rubbing against the cross-member somewhere behind the bumper?

thanks
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post #2 of 10 (permalink) Old 12-01-2017, 10:10
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It could be a wiring failure due to the harness to the lamp chafing on the driver side chassis seam. It's a very common cause of headlamp issues.



There are obviously other possibilities within the headlamp itself, but a 'spontaneous' event seems more likely to be electrical IMO.
Checking this out means removing the front bumper panel. Not a big deal.


TC
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post #3 of 10 (permalink) Old 12-01-2017, 10:23
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Not sure about the 75/ZT but on the ZS/45 I would be checking that the adjuster motor is working first and then that the ball hasn't come out of its socket.
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post #4 of 10 (permalink) Old 13-01-2017, 07:03 Thread Starter
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thanks to you both. the adjuster motor is internal, but will try and have a look when I investigate the problem further.
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post #5 of 10 (permalink) Old 13-01-2017, 07:55
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Hi,
I have exactly the same issue on my Ztt. Mine does work occasionally though so I suspect the wiring rather than dislocation of the mechanism. Would appreciate your findings and will do likewise if I get there first ! snow permitting !
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post #6 of 10 (permalink) Old 13-01-2017, 08:51
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Another common issue is detachment of the reflector from one of the adjuster pivots. The thumbwheel control motor shown below is attached at the centre lower edge with a unversal joint on the white bayonet clip..



The up/down manual adjuster is located on a ball joint centre top and the left/right adjuster to the outer edge. These are arrowed below.



Detachment from the snap-in ball connections is usually the result of an impact or from rough handling during shipment in the post. It won't happen spontaneously. The reflector shown here had the up/down ball socket (top centre) snapped off in the post. You can see where I fixed it with Araldite.
This is a Mk2 reflector, but the Mk1 is basically the same control system.

TC

Last edited by T-Cut; 13-01-2017 at 08:56.
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post #7 of 10 (permalink) Old 14-01-2017, 16:51 Thread Starter
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removed the headlamp today and couldn't see why it wasn't working through the bulb access hole. I could how ever hear with the help of an assistant that the motor in this lamp was turning. I took the headlamp apart, still without seeing anything wrong. measured the resistance between the two sets of motor wires (4 wires going to the motor all together) and for future reference the resistance was 8 ohm. the shaft was very slightly stuck and one of the two motor mounting screws wasn't tightened. maybe this was the problem. anyway now adjusts as it is supposed to and I managed to put the glass back on the headlamp without ruining it
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post #8 of 10 (permalink) Old 14-01-2017, 19:30
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Mines fixed!

I can confirm the wiring harness fault. Have pictures of fail and fix but not posted photos before and not sure how to upload photos.
But now have synchronised dancing headlights !!!!
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post #9 of 10 (permalink) Old 14-01-2017, 20:37
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Quote:
Originally Posted by MrBIW View Post
I can confirm the wiring harness fault. Have pictures of fail and fix but not posted photos before and not sure how to upload photos.
But now have synchronised dancing headlights !!!!
have to use a hoster for the pics (plenty free ones about ) , then post the links here with the img tag(insert image button ) , use preview if your not sure you have done it correctly to check it you have or not
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post #10 of 10 (permalink) Old 16-01-2017, 18:38
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Selection of photos






Last edited by MrBIW; 16-01-2017 at 18:41. Reason: IMAGE LINKS INCORRECT
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