Dip Beam Xenon Headlight Bulbs Blowing.

rmillermundy · Jul 9th, 2014, 09:51

I have a 57 plate XC70 and went to replace the Xenon dipped beam bulb but the new ones blow instantly. With bulbs costing anything from £78 Halfords-£180 (Volvo garage) this is an expensive problem.
Volvo have said to fix this they will need to replace the Xenon Headlight Ballast 6 948 180 Control Unit ECU and the wiring loom and use their own bulbs (£180) as they can't test where the fault is.
I think it is the Control Unit only.
This is going to cost me £500! Any other suggestions?
Anyone know if I can definitely use the Halfords bulbs as Volvo say they don't want to risk it?
Many thanks.
Rory

green van man · Jul 10th, 2014, 05:35

Without knowing the relationship between ballet and ecu it is difficult to isolate the fault. I have in my experience on mains discharge lighting found electronic ballet/control gear fail taking other components with them and often the quickest and cheapest way is to renew the lot, when labour charges are taken into account.
If you renew just the ballest and it was the ecu that caused it to fail then you are down another ballest and the ecu. If it was the ballest that was faulty ,did it take the ecu with it when it failed?
They are expensive units but do a good job, unfortunately when they fail you have to decide to pay the price or convert to standard lighting.
Paul.

Jul 9th, 2014, 09:51	#1
rmillermundy New Member Last Online: Jun 12th, 2015 11:17 Join Date: May 2012 Location: Haddington	Dip Beam Xenon Headlight Bulbs Blowing. I have a 57 plate XC70 and went to replace the Xenon dipped beam bulb but the new ones blow instantly. With bulbs costing anything from £78 Halfords-£180 (Volvo garage) this is an expensive problem. Volvo have said to fix this they will need to replace the Xenon Headlight Ballast 6 948 180 Control Unit ECU and the wiring loom and use their own bulbs (£180) as they can't test where the fault is. I think it is the Control Unit only. This is going to cost me £500! Any other suggestions? Anyone know if I can definitely use the Halfords bulbs as Volvo say they don't want to risk it? Many thanks. Rory

Jul 10th, 2014, 05:35	#2
green van man Premier Member Last Online: Apr 11th, 2024 09:21 Join Date: Nov 2012 Location: Ffos y Ffin	Without knowing the relationship between ballet and ecu it is difficult to isolate the fault. I have in my experience on mains discharge lighting found electronic ballet/control gear fail taking other components with them and often the quickest and cheapest way is to renew the lot, when labour charges are taken into account. If you renew just the ballest and it was the ecu that caused it to fail then you are down another ballest and the ecu. If it was the ballest that was faulty ,did it take the ecu with it when it failed? They are expensive units but do a good job, unfortunately when they fail you have to decide to pay the price or convert to standard lighting. Paul.

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