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Hi There,<p>I recently brought my 05 s80 to the dealership because the radio stoppedd working all together one day. When diagnosted, the tech told me I need a new CEM. CEM's are expensive. I may need one. In which case if any knows where I can buy one that will work with my car, please contact me ASAP.<p>However, I dont understand why I need to replace the entire CEM when its the radio that's the problem. The 12volt does not work with but I hardly use it. If someone can share some insight and/or direction to solve my issue easier and/or cheaper, please advise!<p>Thanks,<p>Owen
 

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Re: Help! Told need CEM but not sure why??? (OBurkie13)

<A HREF="http://forums.swedespeed.com/zerothread?id=121222" TARGET="_blank">http://forums.swedespeed.com/zerothread?id=121222</A><p>George Dill
 

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Re: Help! Told need CEM but not sure why??? (gdill2)

<A HREF="http://forums.swedespeed.com/zeroforum?id=10" TARGET="_blank">http://forums.swedespeed.com/zeroforum?id=10</A><p>George Dill
 

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Re: Help! Told need CEM but not sure why??? (OBurkie13)

Vadis says that the CEM (central electronics module) provides input to the HU (over the canbus) for "luminance of the display and the background lighting for switches" and receives output from the HU confirming "that a diagnostic check has been carried out"--the HU tells the car that it's ok. The steering wheel controls also communicate via the CEM to the HU (AUM).<p>This is just the CEM to AUM communication. The CEM also is involved with the slew of other systems, see below--copied from VIDAS (formatting is crapped out, input and output signals are jumbled; I included this just to give you an idea of what the CEM is involved with).<p>I think that if your CEM is gone that some other systems would be failing, too. Maybe the tech has it backwards and the CEM is telling him that the HU is problematic. I would try to get more info from them and or having someone else look at it. Did they give you the DTC (error codes that were generated--look at your work order).<p>Input signals Output signals<br>Directly connected:Directly connected:<br>-Back-up (reversing) lamp switch (3/10)<br>-Windshield wiper motor (6/1)<br>-Windshield washer level sensor (7/5)<br>-Horn switch (3/37)<br>-Stop lamp switch (3/9)<br>-Control signal P/N position, gear selector module (GSM) (3/156) (automatic transmissions only)<br>-Supplemental restraint system module (SRS) (Airbag OK) (4/9)<br>-Gear-shift position sensor (8/37)<br>-Antenna ring, immobilizer (16/65)<br>-Hazard warning signal flasher switch (3/6)<br>-Fuel level sensor (7/130, 7/143) (Gasoline/diesel)<br>-Seat position sensor driver (3/255-256) (XC90 USA/CDN only)<br>-Twilight sensor (7/12)<br>-Sun sensor (7/12).-Starter motor (6/25)<br>-Headlamp range adjustment (6/38-39) (certain markets)<br>-Windshield wiper (6/1)<br>-Washer motor (6/127)<br>-Horn (16/10-11)<br>-Stop lamps via the rear electronic module (REM) (4/58)<br>-Fuel pump (FP) (6/33)<br>-Hazard warning signal flasher switch (3/6)<br>-Glove compartment lighting (10/29)<br>-Ignition switch lighting (16/65)<br>-Courtesy lighting (10/125-126)<br>-12 V socket (9/25)<br>-Auxiliary lamps (10/65, 10/66)<br>-High beam (10/64, 10/68)<br>-Low beam (10/66, 10/70)<br>-Front parking lamps (10/11-12)<br>-Turn signal lamps (10/13-14, 10/15-16, 10/47, 10/54)<br>-Front fog lamps (10/5-6)<br>-Electrical power steering module (EPS) (4/99).<p>Via serial communication:Via serial communication:<br>-Combustion preheater module (CPM) (4/7) (optional extra)<br>-Light switch module (LSM) (3/111)<br>-Steering wheel module (SWM) (3/254)<br>-Alternator control module (ACM) (6/26).<br>-Blind spot information system (BLIS) (6/62, 6/63) (optional extra)-Combustion preheater module (CPM) (4/7) (optional extra)<br>-Light switch module (LSM) (3/111)<br>-Steering wheel module (SWM) (3/254)<br>-Alternator control module (ACM) (6/26).<br>-Blind spot information system (BLIS) (6/62, 6/63) (optional extra)<br>Via Controller Area Network (CAN) communication:Via Controller Area Network (CAN) communication:<br>-Accessory electronic module (AEM) (optional equipment) (4/78)<br>-Audio module (AUM) (16/1) (not XC90)<br>-Brake control module (BCM) (4/16)<br>-Climate Control Module (CCM) (3/112)<br>-Driver door module (DDM) (3/126)<br>-Differential electronic module (DEM) (optional equipment) (4/82)<br>-Driver information module (DIM) (5/1)<br>-Engine control module (ECM) (4/46)<br>-Electronic throttle module (ETM) (4/50)<br>-Passenger door module (PDM) (3/127)<br>-Phone module (PHM) (optional equipment) (16/60)<br>-Power seat module (PSM) (4/52)<br>-Rear electronic module (REM) (4/58)<br>-Road traffic information module (RTI) (16/45) (optional equipment, not XC90)<br>-Steering wheel angle sensor module (SAS) (3/254)<br>-Supplemental Restraint System Module (SRS) (4/9)<br>-Transmission Control Module (TCM) (4/28)<br>-Upper electronic module (UEM) (4/70)<br>-Suspension module (SUM) (4/84) (optional extra)<br>-Infotainment control module (ICM) (16/94) (XC90 only)<br>-Data link connector (DLC) (17/13).-Accessory electronic module (AEM) (optional equipment) (4/78)<br>-Audio module (AUM) (16/1) (not XC90)<br>-Brake control module (BCM) (4/16)<br>-Climate Control Module (CCM) (3/112)<br>-Driver door module (DDM) (3/126)<br>-Differential electronic module (DEM) (optional equipment) (4/82)<br>-Driver information module (DIM) (5/1)<br>-Engine control module (ECM) (4/46)<br>-Electronic throttle module (ETM) (4/50)<br>-Passenger door module (PDM) (3/127)<br>-Phone module (PHM) (optional equipment) (16/60)<br>-Power seat module (PSM) (4/52)<br>-Rear electronic module (REM) (4/58)<br>-Road traffic information module (RTI) (16/45) (optional equipment, not XC90)<br>-Steering wheel angle sensor module (SAS) (3/254)<br>-Supplemental Restraint System Module (SRS) (4/9)<br>-Transmission Control Module (TCM) (4/28)<br>-Upper electronic module (UEM) (4/70)<br>-Suspension module (SUM) (4/84) (optional extra)<br>-Infotainment control module (ICM) (16/94) (XC90 only)<br>-Data link connector (DLC) (17/13).
 

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Discussion Starter · #5 ·
Re: Help! Told need CEM but not sure why??? (MrTippy)

Dear Mr Tippy,<p>Thank you very much for your response. I appreciate the help. I apologize for my delay. I was on a business trip for 2 weeks and then on vacation (which I did not use my car). Yesterday I brought my car in for an ispection. It passed with flying colors and got a basic maintenence check/oil change. No problems. At the same time, I was having a new motor put in the passenger seat to fix it. I was unable to move the seat. They made the switch and fortunately the part was under warranty. However, the seat was not fixed! They said it must be because of the CEM. Similar to the radio issue.<p>I haven't spoken with the tech yet about the HU. I will. Do you know if this part is cheaper? That would be helpful.<p>If you have any other thoughts, please let me know.<p>Best,<p>Owen
 

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Re: Help! Told need CEM but not sure why??? (OBurkie13)

Now you have two CEM related failures, so maybe the original diagnosis is on the money. Let's see if I can get my favorite Swedespeed tech to weigh in on this. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> Watch this space.
 

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Re: Help! Told need CEM but not sure why??? (MrTippy)

Head Unit is cheaper than the CEM. <br>The HU's are remanufactured. <br>Both will require software downloads to work correctly. <br>I've personally never seen a CEM cause both of your issues but I suppose it could. <br>I've seen MANY bad HU's over the years.<br> <br>Bad 12v in the sockets is almost always fuse F11, I've never seen it not be the issue. And in almost every single case it is a crappy phone charger. Doesn't matter if its name brand or not but in all cases been Made in China.<p>I would at least ask them to guarantee the CEM fixes all your issues or you won't pay them for the repair.
 
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