Member Since: 18 Feb 2016
Location: Wiltshire
Posts: 10
Suspension, HDC, gearbox faults when lights are on
Hi,
I have a 55 plate D3 which drives fine when the lights are off. However, shortly after turning on the sidelights, main beam or the light switch to auto, the transmission will no longer change up through the gears although when manual is selected, it’s still possible to change gears. This is usually followed by an HDC fault and the suspension lowering. I’ve read the fault codes but there are so many, I can’t find anything which appears to be the source of the problem. I’va changed the battery and checked the alternator output voltage but still no luck. I’d be grateful for any advice/ideas.
Thanks very much.
9th Sep 2018 9:20 pm
trainmanone
Member Since: 19 Dec 2014
Location: stockport
Posts: 366
its only a thought have you checked the earth lead from battery to chassis is good and free from corrosion ?
other than that you will have to post all fault codes and someone will be able to help
pete
9th Sep 2018 9:26 pm
apn23
Member Since: 18 Feb 2016
Location: Wiltshire
Posts: 10
Thanks very much for the suggestion. I’ve had a look at the earth cable and it looks fine. I’ll post the codes when I have my reader back.
12th Sep 2018 8:57 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4668
Check battery volts before first start, and alternator output after start too!!yµ (idµ - eAµ) ψ=mψ
13th Sep 2018 2:20 am
Oswiperus D3 Decade
Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1590
Check your brake / tail light bulbs, I suspect that a broken filament in a bulb is shorting between the light circuit and brake light circuit so when you turn on the lights it feeds current into the brake circuit and causes all the faults that you are experiencing.Stu
2016 D4 Landmark current
2022 Defender D300 SE Gone
D4 2014 XS Commercial - Gone
D4 2016 hse lux montalcino red - Gone
D3 2005 se java black - current
D3 2005 base manual - gone
D2 1999 TD5 E white - current
13th Sep 2018 8:16 am
apn23
Member Since: 18 Feb 2016
Location: Wiltshire
Posts: 10
Thanks very much for the further replies. There is definitely something odd with the rear lights. With the lights off, brake lights work fine (which is how I checked previously) but with the lights on, the brake lights don’t work. I will change all the bulbs for Lucas and go from there.
14th Sep 2018 10:49 am
apn23
Member Since: 18 Feb 2016
Location: Wiltshire
Posts: 10
I changed all four rear bulbs for Lucas items and everything appears to be working fine now. Thanks very much Oswiperus.
18th Sep 2018 10:42 pm
Oswiperus D3 Decade
Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1590
Excellent, fingers crossed it stays that way. Stu
2016 D4 Landmark current
2022 Defender D300 SE Gone
D4 2014 XS Commercial - Gone
D4 2016 hse lux montalcino red - Gone
D3 2005 se java black - current
D3 2005 base manual - gone
D2 1999 TD5 E white - current
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