CEM Mark 1 Pinout

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fireblade
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CEM Mark 1 Pinout

Post by fireblade » Tue Oct 29, 2019 1:17 am

Hello,

Does anyone has the pinout/wiring diagram/schematics of a CEM Mark 1 (5 DK 004 696-01) for a 1990 Volvo 480?
The electrical diagram that is avaiable to download only have the CEM Mark 3, and I would like the diagram for the mark 1, because my CEM has some problems and I would like to repair it.

Thanks :)

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brinkie
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Re: CEM Mark 1 Pinout

Post by brinkie » Tue Oct 29, 2019 10:21 am

Though I have a MY 1995 480 with a CEM-III, I have a friend with a MY 1989 480 ES who is equally keen with electronics as I am, and he has more or less reverse engineered the CEM-01 pinout and put it in a Google doc we are both maintaining. Very handy, where there's an internet connection, I have all pinouts in my pocket! (Ha! I have fooled you lot into thinking I am a walking 480 Wikipedia :lol:)
Trouble is, though we are both fluent in English, we haven't got round to translating it, so it has been translated in a rush. Sorry about the formatting.
Wiring colours: Br = Brown, Bl = Blue, Wt = White, SB = Black, R = Red, Gr = Grey, Gn = Green, Y = Yellow

Pin Wire colour Description
A1 nc n/a
A2 Br-Bl Switch door lock drivers side
A3 Wt-Br Warning (Hazard light?)
A4 Bl Diagnose (CEM-01 only)
A5 Br Ground
A6 SB Seat belt
A7 R-Bl Door open drivers side
A8 SB-Br Horn switch
A9 Gr-Gn Switch windscreen washer rear
A10 SB-Gn Windscreen washer rear connector 4
A11 Gn-Br Windscreen washer rear connector 3
A12 Bl-Gr Main beam left fuse 8
A13 nc n/a
A14 Gr-Wt Fuse 19
A15 Y-Br Standing light right fuse 11
A16 Br-Gr Rear light switch "8"
A17 Gn Wiper motor
A18 Wt-Br Switch wiper/washer "J"
A19 Br-Gr Switch door lock passengers side
A20 SB-R Rear windscreen heater switch "6"
A21 Y-SB Check door open
A22 Y-Br Passenger seat belt check
A23 nc n/a
A24 Y-Wt Door open passengers side
A25 Bl-SB Switch lock rear hatch
A26 Bl-Y Auxiliary beam switch through main beam
A27 Gr-Gn pin 85 VEM
A28 Br-R alternator from battery light instrument cluster
A29 Gn Rear wiper through diode
A30 R +12V battery
A31 nc n/a
A32 Wt-SB interior light and reading lights
A33 Wt ?
A34 Bl-Gr Low beam through fuse 6
A35 Wt-Gn ?

B1 Gl-Wt 12V fuse 15
B2 Gn-Br 12V fuse 17
B3 Gl-Wt Rear window heater and mirror heater
B4 Gn-Br Output flasher relay to direction indicator switch

C1 Or 12V fuse 14
C2 Gl-Bl 12V fuse 16
C3 Wt-Bl 12V fuse 23 through ignition relay +75
C4 Wt-Br Full throttle signal
C5 nc n/a
C6 Wt-Gr 12V fuse 18

D1 nc n/a
D2 SB-R Microswitch in bonnet lock
D3 Gr-R Horn
D4 W-Gr Resting position windscreen wiper
D5 W-Gr Headlight washer pump
D6 Bl-Y Auxiliary beams
D7 Or A/C compressor
D8 Br Ground
Robert.

Present cars: 1994 Volvo 480 GT 2.0i Vase Green, 2010 Volvo V70 2.0F Momentum Mystic Silver
Past: 1981 Talbot-Matra Murena 2.2 Rouge Mephisto, 1995 Volvo 480 GT 2.0i Paris Blue

fireblade
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Re: CEM Mark 1 Pinout

Post by fireblade » Wed Oct 30, 2019 10:51 pm

Thank you for you awnser brinkie.

Do you know what is RM bridge in the board (images bellow)? Mine has a pin broke. Should I solder it?

Image

Image

I also would like to know if it is possible to test the board in workbench?

Thanks

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jamescarruthers
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Re: CEM Mark 1 Pinout

Post by jamescarruthers » Wed Oct 30, 2019 10:59 pm

1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2001 Volvo C70 2.4T convertible (Olivolvo)
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

Alan 480
480 Is my middle name
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Location: Aberdeen

Re: CEM Mark 1 Pinout

Post by Alan 480 » Thu Oct 31, 2019 12:38 pm

jamescarruthers wrote:
Wed Oct 30, 2019 10:59 pm
You can test in the car: http://www.volvo-480-europe.org/volvo48 ... lfdiagnose
James

that is a VERY useful link :hopping:
Alan

480 ES 2litre x 2, C30 1.8ES, SS1

dcwalker
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Re: CEM Mark 1 Pinout

Post by dcwalker » Sat Nov 02, 2019 6:35 pm

Alan 480 wrote:
Thu Oct 31, 2019 12:38 pm
jamescarruthers wrote:
Wed Oct 30, 2019 10:59 pm
You can test in the car: http://www.volvo-480-europe.org/volvo48 ... lfdiagnose
James

that is a VERY useful link :hopping:
It is, but I think you'll find that on a post 91 car (which will have a CEM IIl ) the testing of the CEM, like everything else, is done via the diagnostic box under the bonnet...I need to double check that though!

That said, the principle is exactly the same.

David
Current: 1994 480 GT, 1995 480 Celebration 467/480 (plus 2004 C70 Collection, 2014 V60 SE Lux Nav)
Previous: Celebration 346 (sold to Alan480), Celebration 269 (scrapped abandoned project), Celebration 73, 1992 ES, 1988 ES - and numerous other non-480 Volvos!

fireblade
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Re: CEM Mark 1 Pinout

Post by fireblade » Fri Nov 08, 2019 11:06 pm

Does anyone know the reference and where to buy of the relays that are on the CEM.
I would like to buy the two types for spares.

Thanks

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brinkie
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Re: CEM Mark 1 Pinout

Post by brinkie » Sat Nov 09, 2019 3:58 pm

The big ones I have yet to find out where they can be bought separately, the small ones are available for a few quid each through sellers like Conrad.

I think I know what the small strip of metal does which you have pointed out: it is probably a current measuring resistor for the flasher. If the flasher IC detects too little current, the flasher assumes a blown bulb and doubles the flashing frequency. Without it, the flasher won't work, i.e. your Volvo will be turned into a BMW. :P
Robert.

Present cars: 1994 Volvo 480 GT 2.0i Vase Green, 2010 Volvo V70 2.0F Momentum Mystic Silver
Past: 1981 Talbot-Matra Murena 2.2 Rouge Mephisto, 1995 Volvo 480 GT 2.0i Paris Blue

Alan 480
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Re: CEM Mark 1 Pinout

Post by Alan 480 » Sat Nov 09, 2019 7:11 pm

brinkie wrote:
Sat Nov 09, 2019 3:58 pm
The big ones I have yet to find out where they can be bought separately, the small ones are available for a few quid each through sellers like Conrad.
are the big ones not the same as fitted to a 'plug-in' relay, obviusly without the spades on the base??

so if really needed they could be 'hard wired' and 'potted' or use heat shrink around the wires?
Alan

480 ES 2litre x 2, C30 1.8ES, SS1

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brinkie
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Re: CEM Mark 1 Pinout

Post by brinkie » Mon Nov 11, 2019 10:02 am

If the pinout matches, sure, why not. You only have to be sure the relay can cope with the current.
Robert.

Present cars: 1994 Volvo 480 GT 2.0i Vase Green, 2010 Volvo V70 2.0F Momentum Mystic Silver
Past: 1981 Talbot-Matra Murena 2.2 Rouge Mephisto, 1995 Volvo 480 GT 2.0i Paris Blue

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