S40: - Major Lighting Issues

Cheese · Mar 15th, 2011, 19:39

Hi All, this is my first post and am looking for some advice from you seasoned Volvo experts out there.

I have a 2004 S40 1.9TD with multiple light faults and these are as follows:

Nearside dip beam not working, no front sidelights, no front or rear fog lamps or tell tales on instrument panel and headlamp switch green lamp doesn't illuminate when switched on no sound of any relays clicking on CEM except when flashing main beam.

Tail lamps, main beam and offside dip beam ok. All fuses and bulbs are ok.

Any clues would be greatly appreciated.

Regards, Cheese.

Darlo 1 · Mar 15th, 2011, 23:09

First port of call check the wiring loom that runs under the radiator as these often have corroded wires, the actual wires will be swollen indicating were the problem could be. Failing that check all the fuses in the engine bay fuse box and the ones in the cabin up near the bonnet release. Also have heard a faulty ciggerette lighter can cause odd faults to occur, hope this is of use.

littlehomer · Mar 16th, 2011, 09:38

Hey up,

I'd look at changing the CEM. There's a guy on here, Steven, who has an S40 CEM that I tested as working. Has front fogs etc.

I have two CEM units, but they are from V40's.

Should work, one has front fog light activated.

If it's not the CEM, then the wiring loom is a great place to look.

The bulb could be gone in the back of the lighting switch is all.

Many Thanks,

Daniel.

Cheese · Mar 16th, 2011, 19:36

Hi again, some good news, found the cause of the problem! I found a couple of badly corroded and broken wires in the loom behind the washer bottle. cut out the bad bits and soldered in some new lengths and everything is now cushty.

Regards, Cheese

sebaveh · Mar 16th, 2011, 21:25

I see many topics on this forum, about the infamous "corroded wiring loom under radiator".

Can someone point me where exactly is this mess located? Are we talking about heater inside dashboard or the one on front of the engine? And if only applies to RHD models or both?

Darlo 1 · Mar 17th, 2011, 00:43

Quote:

Originally Posted by sebaveh

I see many topics on this forum, about the infamous "corroded wiring loom under radiator".

Can someone point me where exactly is this mess located? Are we talking about heater inside dashboard or the one on front of the engine? And if only applies to RHD models or both?

Usually directly under the radiator, bit of a design fault on Volvos part and can affect left or right hand drive cars. You have to lift the radiator to see the conduit the loom is wrapped in.

Mar 15th, 2011, 19:39	#1
Cheese New Member Last Online: Mar 16th, 2011 19:36 Join Date: Mar 2011 Location: Plymouth	Major Lighting Issues Hi All, this is my first post and am looking for some advice from you seasoned Volvo experts out there. I have a 2004 S40 1.9TD with multiple light faults and these are as follows: Nearside dip beam not working, no front sidelights, no front or rear fog lamps or tell tales on instrument panel and headlamp switch green lamp doesn't illuminate when switched on no sound of any relays clicking on CEM except when flashing main beam. Tail lamps, main beam and offside dip beam ok. All fuses and bulbs are ok. Any clues would be greatly appreciated. Regards, Cheese.

Mar 16th, 2011, 19:36	#4
Cheese New Member Last Online: Mar 16th, 2011 19:36 Join Date: Mar 2011 Location: Plymouth	Sorted Hi again, some good news, found the cause of the problem! I found a couple of badly corroded and broken wires in the loom behind the washer bottle. cut out the bad bits and soldered in some new lengths and everything is now cushty. Regards, Cheese

Mar 15th, 2011, 23:09	#2
Darlo 1 Lunatic. Last Online: Today 22:00 Join Date: Dec 2006 Location: staffordshire	First port of call check the wiring loom that runs under the radiator as these often have corroded wires, the actual wires will be swollen indicating were the problem could be. Failing that check all the fuses in the engine bay fuse box and the ones in the cabin up near the bonnet release. Also have heard a faulty ciggerette lighter can cause odd faults to occur, hope this is of use.

Mar 16th, 2011, 09:38	#3
littlehomer Master Member Last Online: Jul 15th, 2013 11:29 Join Date: Mar 2010 Location: Malvern View Photos By: littlehomer	Hey up, I'd look at changing the CEM. There's a guy on here, Steven, who has an S40 CEM that I tested as working. Has front fogs etc. I have two CEM units, but they are from V40's. Should work, one has front fog light activated. If it's not the CEM, then the wiring loom is a great place to look. The bulb could be gone in the back of the lighting switch is all. Many Thanks, Daniel.

Mar 16th, 2011, 21:25	#5
sebaveh Winegrover Last Online: Jul 17th, 2019 11:08 Join Date: Nov 2009 Location: Slovenska Bistrica	I see many topics on this forum, about the infamous "corroded wiring loom under radiator". Can someone point me where exactly is this mess located? Are we talking about heater inside dashboard or the one on front of the engine? And if only applies to RHD models or both?

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