S40 V40: CEM Wiring/Repair Information

[Rossc0]

Morning guys.

I've been having headlight issues too.

My passenger side main beam isn't working. I've replaced bulb, checked fuse etc etc. I got a used CEM from a scrap yard and changed it over, still not working.

Do i just need to plug the new CEM in, or do i need to disconnect battery etc? Next job is volt meter test i think

[baldmosher]

that's the first job

to quote someone else, if there's 0V across the bulb with the bulb in, and 12V across the contacts with the bulb out, then it's a faulty relay, otherwise it's the wiring

[sagardner]

Hello
Sorry if I have not checked all the info previously in the thread, but I have found it incredibly useful and managed to acquire a 2nd hand CEM for my V40 (2002) to fix a dipped headlight problem, but as a result(assumption), the rear wiper does not function.
My handbook does not refer to any fuses for this, but one thing I did do was to take a fuse out of No. 30 in the engine compartment fuse box to put into th dipped headlight as I had lost it. My handbook refers to 32 as a reserve, but there wasn't one, 31 which had non as 'VAC pump' and 30 as 'Charger AC (...options)'.
Can anyone advise if any of the above will have impacted the rear wiper, whether I need a fuse in No 30, whether the rear wiper may have been an error in the 'new' CEM I fitted etc.
Hope it all makes sense.
PS. I am not good with cars but this forum has probably saved me £500+ in main dealer charges already so much appreciated.

[gatos]

The rear wiper function needs to be programmed in the CEM. If the CEM came from an S40, the rear wiper function will be disabled. It can be easily be programmed with a Volvo DICE. See if there is a memnber near you who can do it for you FOC

[v40alex]

Hi, sounds like you have used a CEM from an S40, it is the same part number but the rear wiper is disabled. There is a fuse (#14) and a relay in the CEM, but if it was an S40 CEM, all you need to do is find someone with DiCE (good indie, main dealer or someone on the forum) then they can enable it for you.

Haha, didn't see gatos' message when I was previewing

[sagardner]

Thank you both
That does explain everything.
I am pretty ignorant about these things, but would have been good if the 'specialist' Volvo breaker had realised when he took the CEM out of the S40!!!
At least I now know what it is.
Many thanks for your help.

Is it possible that I could take the relevant bit out of the old CEM and replace it in the new one?

[gatos]

Originally Posted by sagardner

Thank you both
That does explain everything.
I am pretty ignorant about these things, but would have been good if the 'specialist' Volvo breaker had realised when he took the CEM out of the S40!!!
At least I now know what it is.
Many thanks for your help.

Is it possible that I could take the relevant bit out of the old CEM and replace it in the new one?

We all started by being ignorant and slowly slowly learned things. If you can't find anyone to do it for you, you can send it to me and I can program it for you. Just cover the postage both ways.

[baldmosher]

Gatos is there a thread somewhere listing the local owners with DICE? Or is it a case of being lucky, or turning up at one of the meets?

[gatos]

Originally Posted by baldmosher

Gatos is there a thread somewhere listing the local owners with DICE? Or is it a case of being lucky, or turning up at one of the meets?

You can either pray to the Nordic gods for a DICE owner to pop up, or check here: https://www.zeemaps.com/map?group=280351

[baldmosher]

That is cool. I am likely to try and set up a VM on my laptop as someone else has recommended it but I'll get in touch with RobbieH!