fw2001c4

when i turn on litronics from cold start, they come on fine. it is always after i drive the car, park, then return to it (within a few hrs... last occurance after 2hrs) that it doesnt want to come back on. i did see them flickering last time out but it failed to light and stayed off the entire trip home, about 45mins.

just tried turning them on but they failed to light. its been 2 days which is not the normal rest period for me, which is typically 5 days or so. they both flicker and try to ignite but do not come on. i have an 01 c4.

any ideas?

cdodkin

Ballast or trigger signal failure would be my first bet.

The Litronics use a high voltage to drive the lamps, and this is triggered from the normal lighting circuit via a control ballast.

Lack of high voltage or trigger signal to the ballast control would cause the litronics lamps to staff off.

fw2001c4

thanks for your suggestion cdodkin...

just a few more details. this has been happening for about 2mos now. so say 8-10 occasions. i know i know... i should drive it more. as it did not fire up at all today, we may have reached the next stage.

demosan

COuld be as simple as the light switch as if both flicker at same time I believe there are separate ballasts for each side and Ican't believe they would both fail at the same time. Simply wiggle the light switch and see if the flicker repeats?? Light switch is common failure in all my reading.

Good Luck!! Demosan

Doug Donsbach

As Demosan says, the headlight switch is the prime suspect.

LVDell

Sounds EXACTLY like the light switch. There was a thread just a week or so ago about this.

Here you go!
https://rennlist.com/forums/996-forum/442863-interminnent-litronic-failure-help-please.html

wwest

Check the battery charge cold, and then HOT. And while you're at it check the battery post connections at both ends. HID lights are highly sensitive to battery voltage.

cdodkin

Good point - especially if the car has been used sparingly in recent weeks.

Ray S

It could also be your ignitors. I experienced a similar problem on my 996 when they started to fail on my 996.

wwest

Both failing simultaneously points, typically, to a common source.

fw2001c4

thanks to all for your comments and suggestions. my cpo just expired and i was hoping they might try and take care of me but the dealer wouldnt commit to anything.... just said bring it in, we diagnose and then we'll see what we can do. too much trouble if its just a 100 part. so im gonna try the switch.

i searched all over for a DIY but i couldnt find anything.... prof dell, care to provide me with a step by step? im not real handy but with steps laid out, i should be able to do this. im afraid of breaking something off as i try to dismantle. nothing is ever obvious to me....

or does anyone know a link to a DIY. thanks.

fw2001c4

were your litronics flickering when you had the problem? is an ignitor for each light or for the pair?

LVDell

Here is my thread:
https://rennlist.com/forums/996-forum/358854-litronics-kinda-working.html

Here is the part number:
99661353500

Here is the thread on Renntech.org that has DIY help:
http://www.renntech.org/forums/index...=742&#entry742

Ray S

They didn't flicker, they just took a long time to fire up (sometimes as long as 10-15 minutes).

Let us know what it turn out to be.

wwest

When my '01 C4 started doing this I drove directly to Costco and purchased/installed a new battery. Two years now and no repeat.

The is an igniter/ballast, solid state, for each headlight.