How to: Volvo C30 S40 V50 C70 CEM Removal and Cleaning

How to remove and clean the Central Electronic Module or CEM for short on a Volvo. This particular car I am working with here is a 2007 Volvo C30 and a similar procedure can also be found on the S40, V50, and C70 models. Dirty connection on the CEM can cause quite a few problems either relating to the security system, ignition, gauges, wipers, power accessories, lighting, safety restraint system, a majority of electrical components in the car. For this car, my radio is experiencing an intermediate operation, especially on more humid days. This problem can also pop up if you’ve had a plugged sunroof drain or left a window open during a rain and water managed to get inside the car. #volvo #volvoc30 #volvos40

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Tools/Supplies Needed:
-3/8” drive ratchet
-3/8” drive 3” extension
-10mm 3/8” drive socket
-electrical contact cleaner
-electrical contact protectant
-clean rags
-electric brushes

Procedure:
-disconnect the battery using a 10mm socket with ratchet and 3” extension, remove the negative terminal
-the CEM is located under the dashboard
-remove the fabric cover which has two plastic clips, by just push the center in with your finger which will disconnect the clip
-to pop down there are two twist clips which need to be disconnect and then the panel can be dropped down
-there will be various electrical connectors both on the top and bottom which need to be disconnected
-for the smaller rectangular connectors, they have a lever which needs to be pulled back, this will lift the connector out of it’s location and then it’s disconnected
-for the largest connectors, there are tangs on each side which needs to be depress and they can then be pulled back
-there will also be a couple black connectors that has a tang which needs to be depress and they can be pulled straight out
-pull back the module and pull up to completely remove
-there will be similar lever style electrical connectors on the bottom that need to be disconnected too
-once fully done, the module can then be removed
-for cleaning, we’ll be using contact cleaner, something which helps dissolve corrosion
-first using a brush to remove any loose debris, try to remove as much as possible
-moving onto the contact cleaner, spray the area, allow it to soak and then agitate the surface using the bush
-wash off the area again using more contact cleaner
-repeat if needed, with some contact cleaners you may need to let the solution soak over night to remove any serious corrosion
-while the connections are free of corrosion, I’ll still go over everything just to be safe
-using the procedure, you can spray down the contacts, agitate the surface using the brush if needed, then wash away the area again with contact cleaner
-I decided to remove both electrical components to clean those areas as well
-depending on the contact cleaner, it may evaporate on it’s own either slowly or fast or you may need to dry the area off using compressed air or a clean cloth
-moving back to the car, I have laid down a shop coat to prevent any overspray from the contact cleaner
-remove any loose debris, this time you can use a toothbrush
-spray the connector using the contact cleaner and agitate using the toothbrush
-wash away any debris, then allow it to dry
-move onto the other connectors using the same process
-I left the module for a couple hours to dry and now I’ll be using an electronic terminal protectant which also helps promote connectivity
-using the supplied brush, apply the solution to the male side of the connectors
-clip the module back into it’s location, each wire has a specific shape so they cannot be mixed up
-push the module back into it’s pivot location
-I left the car sit over night just to be safe so the cleaner’s residue has a chance to dry out or evaporate
-push the module back up and screw in the retaining fasteners
-for the fabric cover, the center of the clips must be pushed out so they’re disengaged
-push the clips back into place, then push the centers in so they’re locked into place

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