Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > S40 / V40 '96-'04 General

Notices

S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

CEM Wiring/Repair Information

Views : 216543

Replies : 357

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Feb 17th, 2019, 18:53   #351
airpassion
New Member
 

Last Online: May 22nd, 2020 19:50
Join Date: Feb 2016
Location: Liege
Default CEM Wiring/Repair Information

Hello everyone,
From Belgium, to thank you for the information published on the forum. Thanks to this information, I was able to repair the CEM by replacing one of the two dipped beam relays.
It works, the work is not very easy and requires patience.
But my 2004 V40 with 341,000km, can ride now at night .... Thanks Alan
Attached Images
File Type: jpeg WhatsApp Image 2019-02-16 at 15.17.11.jpeg (160.2 KB, 48 views)
File Type: jpeg WhatsApp Image 2019-02-16 at 15.33.24.jpeg (199.0 KB, 38 views)
airpassion is offline   Reply With Quote
The Following User Says Thank You to airpassion For This Useful Post:
Old Feb 17th, 2019, 19:15   #352
Shug
Member
 

Last Online: Today 18:27
Join Date: Dec 2008
Location: Ligh****er
Default

Brilliant, well done. Future reference tho, if you replaced one, sometimes easier to swap both out with new ones. Unless it’s only me the second one fails within a week.
__________________
Hugh
'01 S40 T4 S With Prins VSi LPG
'03 V40 T Sport Lux With Prins VSi LPG
'04 XC70 2.5T SE LUX AWD (Auto)
'05 C70 T GT (Auto) With Prins VSi LPG

Last edited by Shug; Feb 17th, 2019 at 19:16. Reason: Typo!
Shug is offline   Reply With Quote
The Following User Says Thank You to Shug For This Useful Post:
Old Feb 17th, 2019, 20:03   #353
aldred309uk
Member
 
aldred309uk's Avatar
 

Last Online: Apr 20th, 2021 23:33
Join Date: Sep 2015
Location: Blackburn
Default

Quote:
Originally Posted by Shug View Post
Brilliant, well done. Future reference tho, if you replaced one, sometimes easier to swap both out with new ones. Unless it’s only me the second one fails within a week.
I changed both of mine, one had failed and the second one was bulging like the failed one, probably due to fail shortly afterwards. One year and no issues for me yet!
__________________
Phase 2 1.9tdi V40
aldred309uk is offline   Reply With Quote
The Following User Says Thank You to aldred309uk For This Useful Post:
Old Apr 28th, 2019, 10:56   #354
VolvoVXL
New Member
 

Last Online: Jul 12th, 2019 09:15
Join Date: Apr 2019
Location: Longmont Colorado
Default Cem

I greatly appreciate your post.
I purchased the Haynes book, and I am very disappointed, in the past I got a BMW Motorcycle book from Haynes, and that one is very detailed.
I knew there had to be some relays for the low beams, and by google I found there was a mention of a CEM....but I could not find the location in the car.
Your pictures above gave me hope...but again, I was confused as it shows right above the gas pedal...in my car is on the extreme left of the dashboard....I realized that you show the British car (I am in the U.S.)... I am happy I found this forum. I find that in the UK you care more for your vehicles. Thank you.
VolvoVXL is offline   Reply With Quote
The Following User Says Thank You to VolvoVXL For This Useful Post:
Old Apr 30th, 2019, 13:16   #355
pierremcalpine
Premier Member
 
pierremcalpine's Avatar
 

Last Online: Jan 3rd, 2024 15:43
Join Date: Feb 2012
Location: Toronto Canada
Default

Quote:
Originally Posted by Shug View Post
Brilliant, well done. Future reference tho, if you replaced one, sometimes easier to swap both out with new ones. Unless it’s only me the second one fails within a week.
My second one failed a year later.
__________________
2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles

Click here for my x40 and V70 P3 repair guides
pierremcalpine is offline   Reply With Quote
Old Jun 30th, 2019, 18:27   #356
Supprezz
New Member
 

Last Online: Jun 30th, 2019 18:39
Join Date: Jun 2019
Location: coral springs
Default

Quote:
Originally Posted by aldred309uk View Post
To anyone looking for relays to replace your old ones, the original relay (P1CN012W1) has been discontinued and is tricky to find. I purchased my relays from RS components for £2 each. The relays I bought are made by Panasonic and it comes up as (JSM1-12V-5) and they have worked on my car.
My dipped beam is out with a good bulb, I suspect the relay.

The P1CN012W1 is a very special animal. High inrush current rating (30A) low coil current (50mA 12V/233Ohm), small size 22x17x17mm, unusual 5 pin layout, Form C.

Tough to find a good substitute. Fujitsu is not making a direct substitute.
I'm thinking the whole design is a folly, judging by their recent offerings in automotive headlight relays.
Zettler AC943 has the same pin-out but less current rating. This may be OK if you can accept a shorter cycle life. If changing to LED headlight is an option then it would be OK. Same goes for the above suggestion.
Incandescent inrush current can be 10x the average current, may cause contact-erosion or -welding.

I'm thinking of remoting the relay(s) to a typical socketed automotive relay. Design wise, putting mechanical relays on a board is a bit "optimistic". Those harness contacts and PCB traces aren't very beefy.
The heat generated from those five relay coils is not going to help the reliability of the semiconductors on the board.
Attached Images
File Type: jpg fujitsuMiniAutoRelay.jpg (41.5 KB, 26 views)
Supprezz is offline   Reply With Quote
Old Jul 2nd, 2019, 22:37   #357
Redr0cket
Junior Member
 

Last Online: Jun 30th, 2023 23:33
Join Date: May 2019
Location: Wales
Default

Hi all. This thread is extremely useful. Recently I had both dipped beams just fail on me, with all other lights working OK. I got hold of a used CEM with the same part number and fitted it; however, it isn't working properly. Dipped beams and side lights come on together when you turn the ignition, and on the internal light switch, when the side lights are on, the light indicator on the switch goes out, and when you turn the light switch off the indicator lights up...if that makes sense. Anyway, it would at least appear to confirm that it is indeed a CEM issues as the dipped headlights work!

In another thread, a helpful member said the "VIN" would be wrong even if I get a straight swap for a working CEM. In this thread though, swapping them out seems to be a generally accepted practice. My question is, is there actually any issue at all with swapping them for a CEM that is the same part number?

I have also seen people have unsoldered and soldered new relays for the dipped beam. This is tempting, but I haven't soldered since I was about 12 years old in the school electronics club 🤣 can someone confirm exactly what I will need for this - aside from a soldering iron and solder, please? Any specific iron, too?

Furthermore, does someone have a link for the exact relays that would work?

I have a 2003 V40 Sport 2.0 petrol engine.

The part number of the CEM in there at the minute, and that was working fine, until.recently, is 30621305.

Thank you for any help. It's much appreciated.
Redr0cket is offline   Reply With Quote
Old Jul 3rd, 2019, 20:07   #358
cat2k1
New Member
 

Last Online: Oct 20th, 2019 07:38
Join Date: Jul 2016
Location: Shepton Mallet
Default

Quote:
Originally Posted by viavan View Post
Thanks for the post, headlight dip light doesn't work. trace the problem back to one of the relay in the CEM, VOLVO quote 400 plus for the whole CEM unit. Scrap yard 50 pounds. But you can also buy the Fujitsu relay as a component from sales@inelcohunter.co.uk. not too sure how much each relay cost, because i managed to repair the faulty relay (due to dry joint).
Which relay was it that needed fixing so that I can look it up in the company that you recommended for selling relays? Can you post picture too? I'm after relay for o/s/f indicator as mine has stopped working. Everything in lighting works just not o/s/f indicator.
cat2k1 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 20:49.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.