Cem interchangeability?

clarkey1984 · Aug 27th, 2019, 14:07

Hi all, I'm going to do the checks later but I'm pretty sure my cem has packed up as I've lost a headlight and it's not the bulb, but just wondering if the one from my 02 t4 would fit my 52 2.0, I know both cars are P2, however, the dash clocks and ignition key in the t4 are the same early style as my 99 P1 had, and the se has the later style with the Speedo and rev counter on the opposite sides, plus this car has the flip key, unlike the t4, which has the seperate fob and regular key, I may well be barking up the wrong tree here, but while I've got the t4 sat there doing nothing I figure it's worth a shot.

EDIT: Just did the multimeter test, just over 12v with no bulb plugged in at the holder, 0v with it plugged in.

If the cem from the t4 won't fit then is there anything stopping me from buying a simple relay and using the feed from the other side headlight to trigger it?

Thanks in advance

gatos · Aug 27th, 2019, 15:20

Most probably, both cars have the same CEM, 30621305. In that case you are good to go. Just pop out the footwell cover and check the part numbers.also, if it helps, I refurbish CEMs and offer a 5 year guarantee, so if you want to go down that way let me know. Or if you go ahead and swap your CEMs, I don't mind buying the faulty one off of you

clarkey1984 · Aug 27th, 2019, 15:43

Cheers Gatos, although I've just remembered that the t4 has HID units and the se doesn't, I'll check the part numbers anyway though, cheers

gatos · Aug 27th, 2019, 15:48

CEM is the same irrespective of whether the car has HID or standard headlights

clarkey1984 · Aug 27th, 2019, 16:52

It was literally plug and play, I've had to use some pieces of rubber to secure the reflector for now as changing the bulb 3 times has utterly mutilated whatever held it to the housing, it was floating around and pointing nearly at the floor, I've got it in the right place anyway, dipped looks good both horizontally and vertically, plus full beam is bang on in position too, a proper repair on that is a job for another day, thanks again Gatos, I'll let you know what I'm doing with the other cem, I'm still in a rock / hard place situation what to do with the t4, I'll decide one day lol

gatos · Aug 27th, 2019, 17:26

Broken bit is the headlight adjuster. You can get it from this guy on eBay. https://rover.ebay.com/rover/0/0/0?m...2F323856175127

Bought them myself 4-5 years ago and still going strong

There is also a guide in the articles section of how to replace the headlight adjuster

Redr0cket · Aug 28th, 2019, 09:52

If you do get your CEM refurbished, I can't recommend Gatos highly enough! Great price and top service 👍

Marty5678 · Aug 30th, 2019, 19:06

I'm just wondering as I just found out my CEM is faulty, what would be the quickest way to get a replacement? As I want my headlights to be working again and it's really sketchy to drive when it's getting dark. Live in Ireland for reference.

gatos · Aug 30th, 2019, 19:23

Quote:

Originally Posted by Marty5678

I'm just wondering as I just found out my CEM is faulty, what would be the quickest way to get a replacement? As I want my headlights to be working again and it's really sketchy to drive when it's getting dark. Live in Ireland for reference.

What's the part number?

Marty5678 · Aug 30th, 2019, 19:31

Quote:

Originally Posted by gatos

What's the part number?

30621305
Central Electronic Module RHD
3817900-300

If there is any other numbers you need, let me know.

Aug 27th, 2019, 14:07	#1
clarkey1984 Premier Member Last Online: Apr 13th, 2022 09:41 Join Date: Jul 2014 Location: Beccles	Cem interchangeability? Hi all, I'm going to do the checks later but I'm pretty sure my cem has packed up as I've lost a headlight and it's not the bulb, but just wondering if the one from my 02 t4 would fit my 52 2.0, I know both cars are P2, however, the dash clocks and ignition key in the t4 are the same early style as my 99 P1 had, and the se has the later style with the Speedo and rev counter on the opposite sides, plus this car has the flip key, unlike the t4, which has the seperate fob and regular key, I may well be barking up the wrong tree here, but while I've got the t4 sat there doing nothing I figure it's worth a shot. EDIT: Just did the multimeter test, just over 12v with no bulb plugged in at the holder, 0v with it plugged in. If the cem from the t4 won't fit then is there anything stopping me from buying a simple relay and using the feed from the other side headlight to trigger it? Thanks in advance __________________ 02 V40 T4 S, "Sargent silver" she's back! Last edited by clarkey1984; Aug 27th, 2019 at 14:38.

Aug 27th, 2019, 15:20	#2
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Most probably, both cars have the same CEM, 30621305. In that case you are good to go. Just pop out the footwell cover and check the part numbers.also, if it helps, I refurbish CEMs and offer a 5 year guarantee, so if you want to go down that way let me know. Or if you go ahead and swap your CEMs, I don't mind buying the faulty one off of you __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Aug 27th, 2019, 15:43	#3
clarkey1984 Premier Member Last Online: Apr 13th, 2022 09:41 Join Date: Jul 2014 Location: Beccles	Cheers Gatos, although I've just remembered that the t4 has HID units and the se doesn't, I'll check the part numbers anyway though, cheers __________________ 02 V40 T4 S, "Sargent silver" she's back!

Aug 27th, 2019, 15:48	#4
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	CEM is the same irrespective of whether the car has HID or standard headlights __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Aug 27th, 2019, 16:52	#5
clarkey1984 Premier Member Last Online: Apr 13th, 2022 09:41 Join Date: Jul 2014 Location: Beccles	It was literally plug and play, I've had to use some pieces of rubber to secure the reflector for now as changing the bulb 3 times has utterly mutilated whatever held it to the housing, it was floating around and pointing nearly at the floor, I've got it in the right place anyway, dipped looks good both horizontally and vertically, plus full beam is bang on in position too, a proper repair on that is a job for another day, thanks again Gatos, I'll let you know what I'm doing with the other cem, I'm still in a rock / hard place situation what to do with the t4, I'll decide one day lol __________________ 02 V40 T4 S, "Sargent silver" she's back!

Aug 27th, 2019, 17:26	#6
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Broken bit is the headlight adjuster. You can get it from this guy on eBay. https://rover.ebay.com/rover/0/0/0?m...2F323856175127 Bought them myself 4-5 years ago and still going strong There is also a guide in the articles section of how to replace the headlight adjuster __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Aug 28th, 2019, 09:52	#7
Redr0cket Junior Member Last Online: Jun 30th, 2023 22:33 Join Date: May 2019 Location: Wales	If you do get your CEM refurbished, I can't recommend Gatos highly enough! Great price and top service 👍

Aug 30th, 2019, 19:06	#8
Marty5678 New Member Last Online: Jul 18th, 2023 16:30 Join Date: Oct 2018 Location: Dublin	I'm just wondering as I just found out my CEM is faulty, what would be the quickest way to get a replacement? As I want my headlights to be working again and it's really sketchy to drive when it's getting dark. Live in Ireland for reference.

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