S40 V40: - CEM Wiring/Repair Information - Page 27

ma70 · Nov 19th, 2014, 19:35

Also, if you have no voltage to the headlamp it's worth checking that you have power in & out of the CEM. I have heard of instances where the conectors on the CEM plug were dirty/bent/slack resulting in no supply even though the relay was new.

as298712 · Nov 19th, 2014, 19:57

I have tried two new bulbs and neither worked. I will have to get a multimeter so I can see if there is any voltage at the plug for the headlight.

Ma70, you said that I can check the power going in and out of the CEM....How do I go about doing this? I inspected the plugs and harnesses on the CEM and they all seemed fine. Can I test that with a multimeter?

ma70 · Nov 19th, 2014, 20:35

I haven't personally done it myself, but I believe you can get in to backprobe the multiplugs at the CEM yes. There was a wiring diagram showing the relevant pins somewhere on this thread... I'll try & find the post and quote it

ma70 · Nov 19th, 2014, 20:37

Quote:

Originally Posted by v40alex

You're not doing anything wrong, the forum moved to a new server but unfortunately attachments couldn't come for the ride.

2003
http://www.volvowiringdiagrams.com/v...20Diagrams.pdf

I *think* this should be what I'm thinking of, hopefully be able to see which wires are which along with the photos further up this page showing the pin numbers as you look at the CEM

Florin78 · Nov 26th, 2014, 09:26

Hello i'm new on this forum can any one tell me please how can y switch off automatic headlights from my volvo s40 model 2001 i'm from Spain and if the car don't come with automatic headlights y have to turn them off my central electrical modul is a LHD 30621304 i don't know tu much on this things can y do something or not .Thank you verry much and sorry for my bad inglish.

Thank u but i did it with this
put light switch to the Center position , (sidelights > Green LED ON)
Pull Main beam lever towards you and Hold it there,
Turn light switch to 0
release main beam lever

baldmosher · Dec 16th, 2014, 16:19

I'm late to this party (woo!) but essentially you should get 12V current across the 2 contacts, WITH and WITHOUT the bulb and headlight switches all on. If you get roughly 12V with the bulb out, and 0V with the bulb in, the relay is faulty.

If you get 0V with and without the bulb, it's either a wiring problem or CEM not chucking anything out regardless of the relay.

(I think that's right anyway, it's somewhere further up the thread, Gatos posted it)

Jimboababah · Jan 1st, 2015, 19:44

I'm new to the Volvo forum and have been following the CEM thread.
The O/S headlight on my 1999 Volvo S40 T4 is not working; I have checked the wiring and voltages and that all appears fine.
The CEM fitted at the moment is a 30859700.
Can I fit a 30896698 as an alternative?
Do any members have either available for sale?

gatos · Jan 1st, 2015, 21:45

Quote:

Originally Posted by Jimboababah

I'm new to the Volvo forum and have been following the CEM thread.
The O/S headlight on my 1999 Volvo S40 T4 is not working; I have checked the wiring and voltages and that all appears fine.
The CEM fitted at the moment is a 30859700.
Can I fit a 30896698 as an alternative?
Do any members have either available for sale?

Yes, the 30896698 is 100% compatible.

Jimboababah · Jan 4th, 2015, 21:27

Quote:

Originally Posted by Jimboababah

I'm new to the Volvo forum and have been following the CEM thread.
The O/S headlight on my 1999 Volvo S40 T4 is not working; I have checked the wiring and voltages and that all appears fine.
The CEM fitted at the moment is a 30859700.
Can I fit a 30896698 as an alternative?
Do any members have either available for sale?

Found a Volvo V40 being scrapped at a local yard and got a 3085970 CEM which is now fitted and all lights now working.
The new CEM has had the DRL function turned off so I must select the lights manually.
Should I be able to switch on the parking/side lights with the ignition switch in position I (Intermediate/radio position), at the moment they can only be turned on when the ignition switch is in position II or when the engine is running.

baldmosher · Jan 5th, 2015, 17:05

Method for enabling/disabling DRLs is explained in the manual. You can probably find it on here if you are clever with your searching....

Dipped headlights only work in pos II and main beam only work with the engine running (I think?) but the sidelights should work even with the ignition off completely and the car locked - as long as you switch the headlamp control to the sidelight position (45°)

Don't leave it in that position because it'll drain your battery.

Nov 19th, 2014, 19:35	#261
ma70 Curmudgeon with a turbo Last Online: Jul 1st, 2020 17:48 Join Date: Nov 2014 Location: Congleton	Also, if you have no voltage to the headlamp it's worth checking that you have power in & out of the CEM. I have heard of instances where the conectors on the CEM plug were dirty/bent/slack resulting in no supply even though the relay was new. __________________ (current) '06 P2 S80 D5 SE LUX, Met. Gold/Black leather, 200k (past)'99 P1.5 V40 SE 1.8 (1731cc), Metallic Peacock Blue-Green, Black Leather, Winter Pack. 101k (past) '88 340 GL 1.7, gifted to me with "slipping clutch" that was a sticky linkage

Nov 19th, 2014, 20:35	#263
ma70 Curmudgeon with a turbo Last Online: Jul 1st, 2020 17:48 Join Date: Nov 2014 Location: Congleton	I haven't personally done it myself, but I believe you can get in to backprobe the multiplugs at the CEM yes. There was a wiring diagram showing the relevant pins somewhere on this thread... I'll try & find the post and quote it __________________ (current) '06 P2 S80 D5 SE LUX, Met. Gold/Black leather, 200k (past)'99 P1.5 V40 SE 1.8 (1731cc), Metallic Peacock Blue-Green, Black Leather, Winter Pack. 101k (past) '88 340 GL 1.7, gifted to me with "slipping clutch" that was a sticky linkage

Nov 26th, 2014, 09:26	#265
Florin78 New Member Last Online: Nov 28th, 2014 10:01 Join Date: Nov 2014 Location: madrid	S40 2001 Hello i'm new on this forum can any one tell me please how can y switch off automatic headlights from my volvo s40 model 2001 i'm from Spain and if the car don't come with automatic headlights y have to turn them off my central electrical modul is a LHD 30621304 i don't know tu much on this things can y do something or not .Thank you verry much and sorry for my bad inglish. Thank u but i did it with this put light switch to the Center position , (sidelights > Green LED ON) Pull Main beam lever towards you and Hold it there, Turn light switch to 0 release main beam lever Last edited by Florin78; Nov 26th, 2014 at 11:45. Reason: Iv did it

Dec 16th, 2014, 16:19	#266
baldmosher moshmobile driver Last Online: Apr 22nd, 2023 16:07 Join Date: Nov 2010 Location: Warrington View Photos By: baldmosher	I'm late to this party (woo!) but essentially you should get 12V current across the 2 contacts, WITH and WITHOUT the bulb and headlight switches all on. If you get roughly 12V with the bulb out, and 0V with the bulb in, the relay is faulty. If you get 0V with and without the bulb, it's either a wiring problem or CEM not chucking anything out regardless of the relay. (I think that's right anyway, it's somewhere further up the thread, Gatos posted it) __________________ baldmosher™ Drives: 63 V60 R-Design Lux Nav P* 106K Kill List: 07 S40 SE Sport D5 120K V40 SLux 1.9D 306K V40 S 1.9D 152K VW T4 LDV Pilot Golf GL 1.9TD Saxo 1.1i Fiesta 1.0 Pop

Jan 5th, 2015, 17:05	#270
baldmosher moshmobile driver Last Online: Apr 22nd, 2023 16:07 Join Date: Nov 2010 Location: Warrington View Photos By: baldmosher	Method for enabling/disabling DRLs is explained in the manual. You can probably find it on here if you are clever with your searching.... Dipped headlights only work in pos II and main beam only work with the engine running (I think?) but the sidelights should work even with the ignition off completely and the car locked - as long as you switch the headlamp control to the sidelight position (45°) Don't leave it in that position because it'll drain your battery. __________________ baldmosher™ Drives: 63 V60 R-Design Lux Nav P* 106K Kill List: 07 S40 SE Sport D5 120K V40 SLux 1.9D 306K V40 S 1.9D 152K VW T4 LDV Pilot Golf GL 1.9TD Saxo 1.1i Fiesta 1.0 Pop Last edited by baldmosher; Jan 5th, 2015 at 17:07.

Nov 19th, 2014, 19:57	#262
as298712 New Member Last Online: Nov 20th, 2014 13:57 Join Date: Nov 2014 Location: windsor	I have tried two new bulbs and neither worked. I will have to get a multimeter so I can see if there is any voltage at the plug for the headlight. Ma70, you said that I can check the power going in and out of the CEM....How do I go about doing this? I inspected the plugs and harnesses on the CEM and they all seemed fine. Can I test that with a multimeter?

Jan 1st, 2015, 19:44	#267
Jimboababah New Member Last Online: Nov 12th, 2019 21:26 Join Date: Feb 2008 Location: Chester	I'm new to the Volvo forum and have been following the CEM thread. The O/S headlight on my 1999 Volvo S40 T4 is not working; I have checked the wiring and voltages and that all appears fine. The CEM fitted at the moment is a 30859700. Can I fit a 30896698 as an alternative? Do any members have either available for sale?

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