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Vida CEM swapping

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D2Striff
Posts: 1
Joined: 02 Nov 2025, 13:17
Year and Model: 2011 V50
Location: Ireland
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Post by D2Striff »

Hi everyone, a few years ago I posted a document on how to change configurations in a Facebook group for C30s. It allows you to activate features like cruise control, DRLs, trip computer etc on P1 Volvos (probably can be used for other platforms too but I have never worked on them). I was recently activating some features in my V50 and decided would make a video tutorial while I was at it and have posted it here:
You need a programmer like Xprog, VVDI or orange 5 but for anyone who likes tinkering with P1 Volvos its a but of fun and handy if you've a low spec model like mine! I know this thread is heavily CAN based unlike this method but decided I would post here to contribute something back to the excellent work being done helping people customise their Volvos.

Wembe
Posts: 5
Joined: 03 Nov 2025, 06:49
Year and Model: 2011
Location: Nanyuki

Post by Wembe »

Need a bit of help here, cant find pin 8 to connect the resistor.
I have 4 pins on one end and 2 on the other. Aslo the labling of the 4 pins doesn't correspond with the schematic. So should i follow the schematic or the lables.
When i follow the schematic and put no resistor on R1&R2, i get no output.
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can.jpg
can2.png
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vtl
Posts: 4927
Joined: 16 Aug 2012, 13:35
Year and Model: 2005 XC70
Location: Boston
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Post by vtl »

121 is 12*10^1 = 120 Ohm
103 is 10*10^3 = 10k Ohm

Wembe
Posts: 5
Joined: 03 Nov 2025, 06:49
Year and Model: 2011
Location: Nanyuki

Post by Wembe »

Great, so i dont need to add resistors.
However where do i connect the 3.3v, as per schematics or where indicated?

vtl
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Post by vtl »

Wembe wrote: 03 Nov 2025, 09:49 Great, so i dont need to add resistors.
However where do i connect the 3.3v, as per schematics or where indicated?
https://www.pjrc.com/teensy/card10a_rev2_web.pdf

Wembe
Posts: 5
Joined: 03 Nov 2025, 06:49
Year and Model: 2011
Location: Nanyuki

Post by Wembe »

This is the furthest i get to, what could be the problem?
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Screenshot 2025-11-04 163044.png

vtl
Posts: 4927
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Post by vtl »

You should see a popup window with Teensy's programmer.

Wembe
Posts: 5
Joined: 03 Nov 2025, 06:49
Year and Model: 2011
Location: Nanyuki

Post by Wembe »

vtl wrote: 04 Nov 2025, 08:06 You should see a popup window with Teensy's programmer.
I do as below
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Screenshot 2025-11-04 181217.png

vtl
Posts: 4927
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Post by vtl »

Wembe wrote: 04 Nov 2025, 08:13 I do as below
Show a picture of your hardware.

Wembe
Posts: 5
Joined: 03 Nov 2025, 06:49
Year and Model: 2011
Location: Nanyuki

Post by Wembe »

vtl wrote: 04 Nov 2025, 08:19
Wembe wrote: 04 Nov 2025, 08:13 I do as below
Show a picture of your hardware.
Attachments
IMG_20251104_182157.jpg

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