Volvo Owners Club Forum - View Single Post - CEM / Dipped Beam issue on 2003 V40 Sport.

SwissXC90 · Jul 2nd, 2019, 16:29

It sounds like you have a CEM with a failed relay

You can replace the relays, even the soldered-on relays, with the right tools.
I recommend you fix your own CEM, as that way you have no coding issues.
The CEM is the main brain of the car and the entire car config including VIN etc is stored in the CEM, so fitting one from another care that is coded differently will cause many side effects. A 100% identical CEM with same part number, same software config will work, but the VIN will be wrong. And you cannot check the software config externally.

If you do not have the electronics skills, then contact a repair shop such as the guy in London who can fix your own CEM (at a component level) for you.

See here:
https://volvodiagnostic.com/shop/ind...duct&id_lang=1

Jul 2nd, 2019, 16:29	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	It sounds like you have a CEM with a failed relay You can replace the relays, even the soldered-on relays, with the right tools. I recommend you fix your own CEM, as that way you have no coding issues. The CEM is the main brain of the car and the entire car config including VIN etc is stored in the CEM, so fitting one from another care that is coded differently will cause many side effects. A 100% identical CEM with same part number, same software config will work, but the VIN will be wrong. And you cannot check the software config externally. If you do not have the electronics skills, then contact a repair shop such as the guy in London who can fix your own CEM (at a component level) for you. See here: https://volvodiagnostic.com/shop/ind...duct&id_lang=1 __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.