Hi all,
I have had various headlight problems since purchase of my 'lemon' 9000 CSE 2.0 LPT.
I fixed most of them by replacing / fixing the 'headlamp control unit' that detects bust filaments.
For your info - said unit ( the orange one ) packs up due to vibration causing solder joints to fail. Wish I'd known that earlier ! Anyway I found a replacement ( also turned out to be defective long term but I was on the case by then and fixed both the original and replacement with a soldering iron ! ).
Since then it's been better but occasionally one headlamp won't illuminate on dip beam ( normally the offside one - UK - but very occassionally the nearside one ). Full beam never seems to be a problem. When the bulb doesn't illuminate, the dash displays a fault so the 'control unit' is doing its job.
A 'thump' to the headlamp glass normally fixes it - as does driving some distance - you normally hit a bump that encourages the unilluminated bulb to spring to life.
Is there a known weak spot that accounts for this ? I'm really puzzled.
Graham