Headlight height adjustment not working

Mangizmo · 12th January 2015, 08:12

Just noticed that my headlight load height compensation isn't working, lights work fine but the adjustment wheel has no effect on beam height, currently in the lowest position pointing down......any suggestions?

Number 6 · 12th January 2015, 09:23

Quote:

Originally Posted by Mangizmo

Just noticed that my headlight load height compensation isn't working, lights work fine but the adjustment wheel has no effect on beam height, currently in the lowest position pointing down......any suggestions?

I have the same problem!!!As suggested first port of call is a battery disconnect/reset which I am in the process of doing

stevestrat · 12th January 2015, 09:48

Worst case scenario there are manual adjusters on the headlights. One on the back of the headlight unit does vertical, one visible through a hole in the wing panel does horizontal. Have a look here.

T-Cut · 12th January 2015, 11:14

I know little about the adjuster electrics, but if the thumb wheel doesn't affect the angle of the reflector, it seems to me either the power to the stepper motor is bad or the motor and it's operating arm has seized or the arm is detached from the reflector (unlikely). If both lamps show the same problem, it's obviously electrical. If only one lamp is affected it might be electrical or mechanical. I reckon most likely electrical.

I guess it's a process of logical testing and checking. There's the well known weak spot in the harness where it passes over the offside body seam (wears through). I think a multimeter will be useful to check the supply lines to the lamp motor. Pull the harness connector at the rear of the lamp case and check for voltage at the pin sockets. The top row of small pins go to the motor (one to side bulb). Someone will know the identities. I have a photo if needed but can't advise on what each one does or what voltage to expect.

TC

Departed 32016 · 12th January 2015, 11:35

Mine do the same, bumper off job as the wiring tends to get chaffed.

Mangizmo · 14th January 2015, 05:37

Quote:

Originally Posted by stevestrat

Worst case scenario there are manual adjusters on the headlights. One on the back of the headlight unit does vertical, one visible through a hole in the wing panel does horizontal. Have a look here.

Great, I will go for that option......anything for an easy life

Thanks

Greeners · 16th January 2015, 20:31

chaffed loom on the front chassis leg or one of the adjuster cogs has dropped off

grivas · 27th July 2015, 17:15

What happened to this conversation, found answer and not bothered posting?

RayH · 27th July 2015, 17:31

Quote:

Originally Posted by grivas

What happened to this conversation, found answer and not bothered posting?

Probably

Sadly that often seems to be the case

grivas · 27th July 2015, 17:37

Quote:

Originally Posted by RayH

Probably

Sadly that often seems to be the case

Thank you for your comments, it is rather frustrating to look through many postings to end up with a dead end.
Moderators should consider perhaps of removing the entire thread in these instances as they serve no purpose, or allocate a separate category, and save us all a great deal of time.

12th January 2015, 08:12	#1
Mangizmo Gets stuck in Rover 75 Tourer Join Date: Aug 2013 Location: Barnstaple Posts: 764 Thanks: 154 Thanked 235 Times in 127 Posts	Headlight height adjustment not working Just noticed that my headlight load height compensation isn't working, lights work fine but the adjustment wheel has no effect on beam height, currently in the lowest position pointing down......any suggestions?

12th January 2015, 09:48	#3
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,484 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	Worst case scenario there are manual adjusters on the headlights. One on the back of the headlight unit does vertical, one visible through a hole in the wing panel does horizontal. Have a look here. __________________ Steve T4 Location Map

16th January 2015, 20:31	#7
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	chaffed loom on the front chassis leg or one of the adjuster cogs has dropped off __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

12th January 2015, 11:14	#4
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I know little about the adjuster electrics, but if the thumb wheel doesn't affect the angle of the reflector, it seems to me either the power to the stepper motor is bad or the motor and it's operating arm has seized or the arm is detached from the reflector (unlikely). If both lamps show the same problem, it's obviously electrical. If only one lamp is affected it might be electrical or mechanical. I reckon most likely electrical. I guess it's a process of logical testing and checking. There's the well known weak spot in the harness where it passes over the offside body seam (wears through). I think a multimeter will be useful to check the supply lines to the lamp motor. Pull the harness connector at the rear of the lamp case and check for voltage at the pin sockets. The top row of small pins go to the motor (one to side bulb). Someone will know the identities. I have a photo if needed but can't advise on what each one does or what voltage to expect. TC

12th January 2015, 11:35	#5
Departed 32016 This is my second home Rover 75 Join Date: Sep 2009 Location: Edinburgh Posts: 5,190 Thanks: 101 Thanked 257 Times in 145 Posts	Mine do the same, bumper off job as the wiring tends to get chaffed.

27th July 2015, 17:15	#8
grivas I really should get out more....... Rover 75 CDT Club Tourer Join Date: Nov 2006 Location: Milky Way Posts: 2,381 Thanks: 105 Thanked 513 Times in 382 Posts	What happened to this conversation, found answer and not bothered posting?