Other XC90 Problem: - Full beam

Rousey78 · Oct 25th, 2017, 11:23

Hi everyone,
I have had a problem with my full beam not working. I cant turn it on and I cant'flash' other drivers.

It has been into a garage and they worked on it for a full day and couldnt soleve the problem.

Does anyone on here have any ideas?

Thanks.

Richard

SwissXC90 · Oct 25th, 2017, 14:51

High Beam is controlled by:
1. The LSM light switch module talking to the CEM over a LIN bus
2. The steering wheel module SWM talking to the CEM over a LIN bus

The power to the High Beam is actually switched by the CEM, so it is very easy to verify the CEM output

Connecting VIDA will tell you in about 2 minutes where the problem lies... the LSM, the SWM or the CEM
With VIDA you can switch on each High Beam lamp individually
You can check the steering wheel switches (high beam flasher)
You can check the LSM switches (lights on / off)
Did the garage use VIDA?

My guess is water corrosion in the CEM causing the switching of the relays for the High Beam to have failed.

jamie1131 · Oct 25th, 2017, 15:07

It might be something really really simple, just in case you haven't checked this, it caught me out.

The XC90 has daytime running lights on all the time so your low beams are always on. There is however a headlight switch which can be changed between lights on, lights off (misleading because the low beams stay on) and side lights on (for parking).

It can be confusing at night because if your switch is set to lights off you will still have low beams. However if you try and use the high beams it won't let you.

Tannaton · Oct 25th, 2017, 17:38

Quote:

Originally Posted by jamie1131

It might be something really really simple, just in case you haven't checked this, it caught me out.

The XC90 has daytime running lights on all the time so your low beams are always on. There is however a headlight switch which can be changed between lights on, lights off (misleading because the low beams stay on) and side lights on (for parking).

It can be confusing at night because if your switch is set to lights off you will still have low beams. However if you try and use the high beams it won't let you.

.....but it would still let him use the flash facility

Oct 25th, 2017, 11:23	#1
Rousey78 New Member Last Online: Mar 24th, 2018 07:01 Join Date: Oct 2017 Location: Watford	Full beam Hi everyone, I have had a problem with my full beam not working. I cant turn it on and I cant'flash' other drivers. It has been into a garage and they worked on it for a full day and couldnt soleve the problem. Does anyone on here have any ideas? Thanks. Richard

Oct 25th, 2017, 14:51	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	High Beam is controlled by: 1. The LSM light switch module talking to the CEM over a LIN bus 2. The steering wheel module SWM talking to the CEM over a LIN bus The power to the High Beam is actually switched by the CEM, so it is very easy to verify the CEM output Connecting VIDA will tell you in about 2 minutes where the problem lies... the LSM, the SWM or the CEM With VIDA you can switch on each High Beam lamp individually You can check the steering wheel switches (high beam flasher) You can check the LSM switches (lights on / off) Did the garage use VIDA? My guess is water corrosion in the CEM causing the switching of the relays for the High Beam to have failed. __________________ 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 25th, 2017, 15:07	#3
jamie1131 Member Last Online: Mar 11th, 2021 08:41 Join Date: Jan 2017 Location: Portsmouth	It might be something really really simple, just in case you haven't checked this, it caught me out. The XC90 has daytime running lights on all the time so your low beams are always on. There is however a headlight switch which can be changed between lights on, lights off (misleading because the low beams stay on) and side lights on (for parking). It can be confusing at night because if your switch is set to lights off you will still have low beams. However if you try and use the high beams it won't let you.

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