Electrics: - XC90 REM and Brake Relay

Swiftoire · May 24th, 2018, 19:29

Hi,
I have what appears to be a common fault with my XC90 (56 plate D5) in that upon braking I’m getting the high level light on but not the lower lights within the clusters. I’ve tried to do my research, checked through the other threads, googled the life out of it and even invested in a set of workshop manuals. All the information I am getting suggests that the fix should be to replace the brake relay (15 if I remember correctly) within the REM. Also a test to prove/disprove the fault would be to swap it out with relay 16, the fog light relay. My issue is that my REM looks completely dissimilar to all the ones within any photos or diagrams that I’ve found. The label suggests it is an “H” model and instead of 3 banks of relays I have 20 or so fuses and two large plugs (one brown, one black). I should say all fuses, both bulbs, the brake pedal micro switch and as far as I can ascertain the brake wiring from front to back appear sound. With this model of REM is there a relay somewhere else? Or should I now be considering CEM? If anyone has any thoughts, further info or has had similar issues I’d appreciate the input.

Cheers in advance!

SwissXC90 · May 24th, 2018, 20:32

What MY is your XC90?

Swiftoire · May 24th, 2018, 22:55

Hi Swiss, it’s a 2006

SwissXC90 · May 25th, 2018, 06:43

Thanks. Remember that many international members are on this forum, and identifying the age of a vehicle using the UK registration plate system means nothing to non-UK people like myself.

I think your REM uses electronics to switch the brake lights, and not relays. I might be wrong...

I recommend you call Volvo Diagnsotic in London, he can likely fix the electronics for you, he's pretty good:
http://volvodiagnostic.com/shop/index.php

May 24th, 2018, 19:29	#1
Swiftoire New Member Last Online: Jul 18th, 2022 15:24 Join Date: May 2018 Location: Chester	XC90 REM and Brake Relay Hi, I have what appears to be a common fault with my XC90 (56 plate D5) in that upon braking I’m getting the high level light on but not the lower lights within the clusters. I’ve tried to do my research, checked through the other threads, googled the life out of it and even invested in a set of workshop manuals. All the information I am getting suggests that the fix should be to replace the brake relay (15 if I remember correctly) within the REM. Also a test to prove/disprove the fault would be to swap it out with relay 16, the fog light relay. My issue is that my REM looks completely dissimilar to all the ones within any photos or diagrams that I’ve found. The label suggests it is an “H” model and instead of 3 banks of relays I have 20 or so fuses and two large plugs (one brown, one black). I should say all fuses, both bulbs, the brake pedal micro switch and as far as I can ascertain the brake wiring from front to back appear sound. With this model of REM is there a relay somewhere else? Or should I now be considering CEM? If anyone has any thoughts, further info or has had similar issues I’d appreciate the input. Cheers in advance!

May 24th, 2018, 20:32	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	What MY is your XC90? __________________ 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.

May 25th, 2018, 06:43	#4
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	Thanks. Remember that many international members are on this forum, and identifying the age of a vehicle using the UK registration plate system means nothing to non-UK people like myself. I think your REM uses electronics to switch the brake lights, and not relays. I might be wrong... I recommend you call Volvo Diagnsotic in London, he can likely fix the electronics for you, he's pretty good: http://volvodiagnostic.com/shop/index.php __________________ 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.

May 24th, 2018, 22:55	#3
Swiftoire New Member Last Online: Jul 18th, 2022 15:24 Join Date: May 2018 Location: Chester	Hi Swiss, it’s a 2006

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