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Discussion Starter · #1 ·
Hi Everyone - first post so here goes.

My 2007 300c has factory HID headlamps and one went out the other night. The lamps are quite new so suspecting something else I swapped the lamps over and nothing just the passenger head light works. I swapped the number 1 and 2 fuses over and still nothing.

Having proven it isn't the lamp or fuse I booked it into a Chrysler dealer for diagnostics.

They just called to say all wiring checks out and there's no fault codes.

They also say that now both headlights won't come on when it was dropped off the passenger side worked just fine!

They suspect the actual headlight units themselves and are going to plug in new ones and check whether they work or not.

I cannot believe this, how can both headlight units fail like this? I had suspected the ballast thing under the drivers headlight at first but now both, at once?!

These units are £620 each plus vat and you need to take the whole front grille off to get to the fixings - we could be talking 2 grand here in dealer world.

It only went in with one HID lamp not coming on!!!

anyone had any experience in this area - I'm just wondering if the dealer has blown something up here!!
 

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If you've checked both the fuses, check the relay too. If relay is good, double check the bulbs & ballasts & see they've not been unplugged.

Here the location of the relay

(ignore the red marking, look for the high intensity discharge relay)
 

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Hi and welcome!
 

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Check the ground wire connection(s), located on the frame just behind the headlamps in the engine compartment, for loose/corroded connection(s).
 
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Discussion Starter · #6 ·
Hi Everyone - first post so here goes.

My 2007 300c has factory HID headlamps and one went out the other night. The lamps are quite new so suspecting something else I swapped the lamps over and nothing just the passenger head light works. I swapped the number 1 and 2 fuses over and still nothing.

Having proven it isn't the lamp or fuse I booked it into a Chrysler dealer for diagnostics.

They just called to say all wiring checks out and there's no fault codes.

They also say that now both headlights won't come on when it was dropped off the passenger side worked just fine!

They suspect the actual headlight units themselves and are going to plug in new ones and check whether they work or not.

I cannot believe this, how can both headlight units fail like this? I had suspected the ballast thing under the drivers headlight at first but now both, at once?!

These units are £620 each plus vat and you need to take the whole front grille off to get to the fixings - we could be talking 2 grand here in dealer world.

It only went in with one HID lamp not coming on!!!

anyone had any experience in this area - I'm just wondering if the dealer has blown something up here!!
Thanks everyone! It's still at the dealer at present I'll go through this lot with them if they try and sell me 2 complete new head lights - having said that they won't work either if its the relay or software or a ground wire.

Cheers.
 

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Sounds like the first bulb out was the ballast on that side. And, if enough on/off cycles were performed, the system may have determined there was an overall fault with the headlights and shut power off to both of them.

You should not need an entire capsule. The ballasts are now an available service part.
 
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