S40 V40: CEM Wiring/Repair Information

[baldmosher]

siamblue has now contacted me, apologies everyone for the brief thread hijack

PS back on topic, my local friendly auto electrician reckons he can reprogram the 2002 CEMs (if for example I got an S40 CEM that didn't have rear wash/wipe function). Which means if he can do it, others can too. Unless he's talking bullshine of course and he can't really do it....

[Elchopperfreak]

Hi
What would be the relay for the winshield wipers, just got a V40 and the wipers stop in the position were you switch them off.
Thanks

[yalinf]

Thank you to all involved in this thread.

I brought a 2003 V40 1.9D 2 weeks ago with what I thought was a blown near side dipped beam bulb.

Tried changing it to no avail. Pulled out headlight etc to check wiring but all was fine.

Quick google search brought up a few things but in particular this.

Managed to get 2 new relays this am from RS as per link on earlier page, fitted them both (N/S and O/S save doing it again later) and now working like a treat.

Out of curiousity (and after making sure new ones worked), I stripped the 2 old relays to see if there was a difference. The result is the faulty 1 has a dirty/ burnt out contact as per picture;

Faulty N/S relay on the left, Working O/S on the right;



How did we survive without the internet?

Thanks again all and I look forward to being a more active member on this friendly forum.

Chris.

[hawkins]

i have similiar problem in that front and rear fog lamps and the dash tell tales dont work neither do front and rear parking lights or switch illumination help! 2002 s40 diesel sport im thinking cem packing up

[T4Rick]

This is a really good thread

[RandomGuy]

Hi all,
I have an 02 S40 1.9D Sport. Had a similar problem, n/s dipped beam not working. Bought "fully tested" replacement CEM from Ebay. Fitted and now have n/s dipped beam but no main beams in any of the switch positions. Refitted original CEM and main beams returned. Contacted seller, who says CEM needs to be reprogrammed! Other contributors to this forum have bought CEM's from scrappies and not had to do this.

Have I been conned or just unlucky? Surely whatever car it is from, the main beams should work?

Can I just swap the n/s dipped beam relay to my old CEM?

[cnoe]

Long time lurker, first time poster. Just finished replacing the faulty relay in the CEM of my 03 S40 and had to offer my appreciation to this thread. With literally zero PCB/solder skills, was able to replace my relay and resolve my right headlight issue within an hour start to finish. $7 with shipping sure beats the Volvo quote (over $1200) or the used option on eBay ($150).

Thanks all! Cheers-

[RandomGuy]

Originally Posted by RandomGuy

Hi all,
I have an 02 S40 1.9D Sport. Had a similar problem, n/s dipped beam not working. Bought "fully tested" replacement CEM from Ebay. Fitted and now have n/s dipped beam but no main beams in any of the switch positions. Refitted original CEM and main beams returned. Contacted seller, who says CEM needs to be reprogrammed! Other contributors to this forum have bought CEM's from scrappies and not had to do this.

Have I been conned or just unlucky? Surely whatever car it is from, the main beams should work?

Can I just swap the n/s dipped beam relay to my old CEM?

Any ideas?

[gatos]

Originally Posted by RandomGuy

Any ideas?

It is a programmable feature that can be done by anyone with DICE. However, I find it really hard to believe that someone programmed the CEM disabling the main beams

[chubby brown]

Originally Posted by RandomGuy

Any ideas?

corroded wiring loom under the radiator