Electrics: - SWM no signal

DrJones · Oct 24th, 2019, 11:51

hey guys,

i am from Germany and hope i can find some help here. Im having a XC90 from 2007 (with facelift).

It all started with time to time failures of the turn indicator. I pressed the switch down but there was no sound and no lights. Next time, it worked again.

Since a month, all functions related to the SWM do not work (turn indicators, beam light, multi functions controls, cruise functions, wiper only in one speed, etc.). I checked it with VIDA, got CEM-DDxxx Codes which says no signal from Steering Wheel Module (SWM). I replaced it with a used one from ebay. I went to the dealer to do SAS and SWM reload. I still recieve following codes:

CEM-DD41 Communication with SWM - no communication
CEM-DD50 Communication with SWM - no signal
CEM-DD51 Communication with SWM - no signal
DEM-DD52 Communication with SWM - no signal
ECM-928C Cruise Control - faulty signal

Is there a possibility to check the SWM in VIDA? Maybe the replacement one is also faulty. Next thing is, maybe the plugs.

I want to check all possibilities before sending the CEM to repair. I heard that all XC90 are having problems with the CEM due to water coming in. However, this should be fixed within the facelift upgrade.

Hope to hear from you guys soon and thanks in advance.

Bests, Jonas

paddy74 · Oct 24th, 2019, 14:37

Besides all DTCs, have you "cleaned" the turn indicator and wiper lever? These are easy to pull out and often only need a good clean.

Next would be to check the battery. Batteries at the end of their life cycle tend to do mysterious things in our cars.

If these are ok, I'd take the next step by cleaning the contacts (CEM and fuse box(es).

S60D5-185 · Oct 24th, 2019, 15:13

Quote:

Originally Posted by paddy74

Besides all DTCs, have you "cleaned" the turn indicator and wiper lever? These are easy to pull out and often only need a good clean.

+1

I had the same issue on my XC70 and this was the fix for me that I found on youtube.

+ YouTube Video

Chilly · Oct 26th, 2019, 05:48

I had problems with the indicator even with a brand new indicator stalk. The problem in my case was in the wiper stalk. Gave it a good clean inside on the glide connection plates. After that it worked perfect.

DrJones · Nov 1st, 2019, 10:54

Hey guys, many thanks to all of you for your responses!

Wiper/Indicator Cleaning: This was the first thing I did (Indicator Switch), I also opened it and cleaned the contacts inside. The ne SWM i bought was with two new (used) switches, one for the indicator and one for the wiper. After replacement, it also did not work. However, they are used, and i think i will try this again!

Battery: Good hint. Battery should be changed before this winter anyway!

CEM: Today i will remove the CEM and look for corrosion and clean all contacts. Hope there will be some change, then i know its the CEM!

(I also got some signal issues with the PDC and already changed all sensors. Maybe it also comes from the CEM)

I will write you an update after the works explained.

Bests, Jonas

SwissXC90 · Nov 1st, 2019, 12:43

Quote:

Originally Posted by DrJones

(I also got some signal issues with the PDC and already changed all sensors. Maybe it also comes from the CEM)

You are throwing parts at it without a proper diagnosis.
VIDA would tell you exactly how the PDC system works, and you can see which of the sensors is not working, and thus only need to buy one sensor

VIDA will show you clearly that the CEM has nothing to do with the PDC

DrJones · Nov 1st, 2019, 19:03

Hey guys,

regarding the PDC: I changed the sensor about one year ago. At that time i did not had VIDA. However, this is off topic.

Today i did cleaned all 4 switches (the old ones from me + the two used i bought). Then i refitted with all possible options of the 4 switches, no changes. So i think it is not a Switch.

I then removed the CEM. All contacts looked good. However, on the top was a lot of dust. I then cleaned the CEM on the top an sprayed contact spray on all contacts + cleaned them with a small brush. After reassembling, there was no change.

Tomorrow i will buy a new battery which is anyway neccessery since the current one has a low voltage.

If that will not leed to any change, then I will buy new /let repair the current CEM.

Looking forward to your responses!

Jonas

DrJones · Nov 4th, 2019, 18:04

Hey all,

i had in mind that the battery is already weak and needs to be changed. Today I checked it again after driving and then leaving the volvo for some hours. The battery still had 12,57 V. However, i dont know how old this battery is.

Can i do anything else before sending the CEM to repair?

Bests, Jonas

DrJones · Dec 13th, 2019, 15:43

Hey guys, i changed the volvo dealer and the mechanic found the problem: it was the cruise control switch which interferred the signal.

A tip from him: detach single parts from the SWM and then check the function. It is always one part which is interrupting the signal. So for example detach the indicator switch and try again. If still not working, detach the wiper and check. And so on. With this workflow, you can first check all parts and then see which one is broken.

VIDA will always just tell you that there is a problem within the LIN BUS system.

kind regards,
Jonas

SwissXC90 · Dec 13th, 2019, 16:08

The tip you got is standard fault finding process

Oct 24th, 2019, 11:51	#1
DrJones New Member Last Online: Dec 13th, 2019 15:43 Join Date: Oct 2019 Location: Kressbronn	SWM no signal hey guys, i am from Germany and hope i can find some help here. Im having a XC90 from 2007 (with facelift). It all started with time to time failures of the turn indicator. I pressed the switch down but there was no sound and no lights. Next time, it worked again. Since a month, all functions related to the SWM do not work (turn indicators, beam light, multi functions controls, cruise functions, wiper only in one speed, etc.). I checked it with VIDA, got CEM-DDxxx Codes which says no signal from Steering Wheel Module (SWM). I replaced it with a used one from ebay. I went to the dealer to do SAS and SWM reload. I still recieve following codes: CEM-DD41 Communication with SWM - no communication CEM-DD50 Communication with SWM - no signal CEM-DD51 Communication with SWM - no signal DEM-DD52 Communication with SWM - no signal ECM-928C Cruise Control - faulty signal Is there a possibility to check the SWM in VIDA? Maybe the replacement one is also faulty. Next thing is, maybe the plugs. I want to check all possibilities before sending the CEM to repair. I heard that all XC90 are having problems with the CEM due to water coming in. However, this should be fixed within the facelift upgrade. Hope to hear from you guys soon and thanks in advance. Bests, Jonas

Oct 24th, 2019, 14:37	#2
paddy74 Senior Member Last Online: Mar 29th, 2021 13:49 Join Date: May 2019 Location: Near Munich	Besides all DTCs, have you "cleaned" the turn indicator and wiper lever? These are easy to pull out and often only need a good clean. Next would be to check the battery. Batteries at the end of their life cycle tend to do mysterious things in our cars. If these are ok, I'd take the next step by cleaning the contacts (CEM and fuse box(es). __________________ Volvo XC90 D5 AWD Summum MY05 Harley-Davidson Ultra Classic Electra Glide MY91 FLHTCU

Nov 1st, 2019, 10:54	#5
DrJones New Member Last Online: Dec 13th, 2019 15:43 Join Date: Oct 2019 Location: Kressbronn	Hey guys, many thanks to all of you for your responses! Wiper/Indicator Cleaning: This was the first thing I did (Indicator Switch), I also opened it and cleaned the contacts inside. The ne SWM i bought was with two new (used) switches, one for the indicator and one for the wiper. After replacement, it also did not work. However, they are used, and i think i will try this again! Battery: Good hint. Battery should be changed before this winter anyway! CEM: Today i will remove the CEM and look for corrosion and clean all contacts. Hope there will be some change, then i know its the CEM! (I also got some signal issues with the PDC and already changed all sensors. Maybe it also comes from the CEM) I will write you an update after the works explained. Bests, Jonas Last edited by DrJones; Nov 1st, 2019 at 11:01.

Dec 13th, 2019, 16:08	#10
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	The tip you got is standard fault finding process __________________ 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.

Oct 26th, 2019, 05:48	#4
Chilly New Member Last Online: Apr 21st, 2021 20:20 Join Date: Feb 2014 Location: Eskilstuna	I had problems with the indicator even with a brand new indicator stalk. The problem in my case was in the wiper stalk. Gave it a good clean inside on the glide connection plates. After that it worked perfect.

Nov 1st, 2019, 19:03	#7
DrJones New Member Last Online: Dec 13th, 2019 15:43 Join Date: Oct 2019 Location: Kressbronn	Hey guys, regarding the PDC: I changed the sensor about one year ago. At that time i did not had VIDA. However, this is off topic. Today i did cleaned all 4 switches (the old ones from me + the two used i bought). Then i refitted with all possible options of the 4 switches, no changes. So i think it is not a Switch. I then removed the CEM. All contacts looked good. However, on the top was a lot of dust. I then cleaned the CEM on the top an sprayed contact spray on all contacts + cleaned them with a small brush. After reassembling, there was no change. Tomorrow i will buy a new battery which is anyway neccessery since the current one has a low voltage. If that will not leed to any change, then I will buy new /let repair the current CEM. Looking forward to your responses! Jonas

Nov 4th, 2019, 18:04	#8
DrJones New Member Last Online: Dec 13th, 2019 15:43 Join Date: Oct 2019 Location: Kressbronn	Hey all, i had in mind that the battery is already weak and needs to be changed. Today I checked it again after driving and then leaving the volvo for some hours. The battery still had 12,57 V. However, i dont know how old this battery is. Can i do anything else before sending the CEM to repair? Bests, Jonas

Dec 13th, 2019, 15:43	#9
DrJones New Member Last Online: Dec 13th, 2019 15:43 Join Date: Oct 2019 Location: Kressbronn	Hey guys, i changed the volvo dealer and the mechanic found the problem: it was the cruise control switch which interferred the signal. A tip from him: detach single parts from the SWM and then check the function. It is always one part which is interrupting the signal. So for example detach the indicator switch and try again. If still not working, detach the wiper and check. And so on. With this workflow, you can first check all parts and then see which one is broken. VIDA will always just tell you that there is a problem within the LIN BUS system. kind regards, Jonas

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