2012 XC70 - Interior lights not working with doors

warninglight · Feb 4th, 2018, 20:02

I picked up my XC70 yesterday, and I love it!

One thing I have noticed is that the interior lights don't come on when I unlock the car, or open the doors. They do work if I switch them on manually, but leaving the switch in the middle position seems to mean they don't work. I've noticed that a couple of times, on turning the engine off, they have come on for maybe a second or so before knocking off.

When I picked it up, I was getting the 'low battery' warning quite soon after knocking the engine off too. Could this be related? Electric tailgate etc. all still work as expected, so it seems odd that it would kill the interior lights.

The boot area light works when the boot is open, the doors all lock properly etc, so I'm a bit confused! Am I missing something obvious? I'm assuming it's not a fuse as the lights work when switched on manually. The footwell lights do come on when I unlock, also.

Hope someone has seen this before and sorted it...

dped · Feb 4th, 2018, 21:18

I pick up my 10plate yesterday too so not much time to play with it. But think if you go into your menu there should be light settings that you might be able to change.

warninglight · Feb 5th, 2018, 06:27

I've had a look in there and can't see any settings to do with the interior lights, will check again though! Thanks.

Model flyer · Feb 5th, 2018, 09:40

The light switches in the roof will switch the lights I believe. Press and hold the center switch to reset door switching . It's used to switch off lights when working with doors open to save flatting battery. Details in manual.

warninglight · Feb 5th, 2018, 19:18

It's not that, I'm afraid. They are now coming on for a second or two when opening a door or turning off the engine. They come on gradually as is normal in a Volvo, but then turn off instantly a couple of seconds later, no gradual dimming.

I'm beginning to suspect an issue with the controller for the interior lights - or possible water damage to the interior light unit, as the windscreen may have the leaky top edge? It hasn't rained since I've had it to know if that's a current issue!

The low battery warning is now gone but the lights aren't right yet.

Simon Jones · Feb 7th, 2018, 23:27

Is it possible previous owner has replaced bulbs with LEDs? That would certainly explain why they don't gradually fade out.

apersson850 · Feb 8th, 2018, 08:56

They should stay on longer than a few seconds anyway.
There's no "center button" either in this model. No, something is wrong. Since they do go on, it doesn't look like it's the door switches. Have you tried with all four doors?

warninglight · Mar 5th, 2018, 21:22

Bit of an update on this now I have VIDA working...

CEM B1D1A12 - Interior Lights Circuit "C" - General Electrical Failures - Circuit Short to Battery

I've removed the light units to check for any visible damage on the circuit boards, I did see a little bit of corrosion between a couple of connector pins so I cleaned those up, and checked resistance across all the lamps, and they were all fine. I can't dismantle the light units to get at the backs of the PCBs without destroying some plastic welds. I'm wondering if that unit is coded to the car, or if I may be able to swap from a working car to check.

Otherwise, how do I get to the CEM to check for any damage that end? VIDA wasn't particularly helpful in showing where it is.

apersson850 · Mar 7th, 2018, 16:25

The CEM is in front of the glove compartment.

warninglight · Mar 7th, 2018, 20:18

Is it on the LHS on a RHD car? That was my main query, as any diagrams I've seen pointing to it show LHD cars.

Feb 4th, 2018, 20:02	#1
warninglight VOC Member Last Online: Feb 9th, 2024 15:31 Join Date: Dec 2011 Location: South Lakes	2012 XC70 - Interior lights not working with doors I picked up my XC70 yesterday, and I love it! One thing I have noticed is that the interior lights don't come on when I unlock the car, or open the doors. They do work if I switch them on manually, but leaving the switch in the middle position seems to mean they don't work. I've noticed that a couple of times, on turning the engine off, they have come on for maybe a second or so before knocking off. When I picked it up, I was getting the 'low battery' warning quite soon after knocking the engine off too. Could this be related? Electric tailgate etc. all still work as expected, so it seems odd that it would kill the interior lights. The boot area light works when the boot is open, the doors all lock properly etc, so I'm a bit confused! Am I missing something obvious? I'm assuming it's not a fuse as the lights work when switched on manually. The footwell lights do come on when I unlock, also. Hope someone has seen this before and sorted it... __________________ 2008 XC70 SE Lux D5 - 1966 Amazon - 1979 C202 Laplander Past: 1997 S70 TDi, 1997 C70 T5 GT, 2003 V70 Bi-Fuel, 2000 Ph2 V70 2.5D, 1997 V70R Auto FWD, 1998 V70R Manual AWD, 2004 XC90 D5 G/T, 2005 S60 D5

Feb 5th, 2018, 06:27	#3
warninglight VOC Member Last Online: Feb 9th, 2024 15:31 Join Date: Dec 2011 Location: South Lakes	I've had a look in there and can't see any settings to do with the interior lights, will check again though! Thanks. __________________ 2008 XC70 SE Lux D5 - 1966 Amazon - 1979 C202 Laplander Past: 1997 S70 TDi, 1997 C70 T5 GT, 2003 V70 Bi-Fuel, 2000 Ph2 V70 2.5D, 1997 V70R Auto FWD, 1998 V70R Manual AWD, 2004 XC90 D5 G/T, 2005 S60 D5

Feb 5th, 2018, 09:40	#4
Model flyer Master Member Last Online: Dec 15th, 2023 18:46 Join Date: Jan 2006 Location: Kent,pothole capital of UK.	The light switches in the roof will switch the lights I believe. Press and hold the center switch to reset door switching . It's used to switch off lights when working with doors open to save flatting battery. Details in manual. __________________ The secret of flight is to aim at the ground and miss ! Previous Volvos 740 GLE . V40 CD ,V70 2.4 SE LPT.V70 D5 P2. V70 D5 Se Lux P3. Current Jaguar XF Sportbrake but still like Volvos

Feb 5th, 2018, 19:18	#5
warninglight VOC Member Last Online: Feb 9th, 2024 15:31 Join Date: Dec 2011 Location: South Lakes	It's not that, I'm afraid. They are now coming on for a second or two when opening a door or turning off the engine. They come on gradually as is normal in a Volvo, but then turn off instantly a couple of seconds later, no gradual dimming. I'm beginning to suspect an issue with the controller for the interior lights - or possible water damage to the interior light unit, as the windscreen may have the leaky top edge? It hasn't rained since I've had it to know if that's a current issue! The low battery warning is now gone but the lights aren't right yet. __________________ 2008 XC70 SE Lux D5 - 1966 Amazon - 1979 C202 Laplander Past: 1997 S70 TDi, 1997 C70 T5 GT, 2003 V70 Bi-Fuel, 2000 Ph2 V70 2.5D, 1997 V70R Auto FWD, 1998 V70R Manual AWD, 2004 XC90 D5 G/T, 2005 S60 D5

Feb 7th, 2018, 23:27	#6
Simon Jones Premier Member Last Online: Jan 15th, 2022 11:23 Join Date: Feb 2009 Location: Salisbury (ish)	Is it possible previous owner has replaced bulbs with LEDs? That would certainly explain why they don't gradually fade out. __________________ 2008 XC70 3.2 SE Lux with LPG conversion - current 2005 XC70 D5 SE Lux - sold 2004 XC70 D5 SE Lux - written off by another XC70 2001 V70 D5 - sold 2000 V70 Classic 2.4 - sold

Feb 4th, 2018, 21:18	#2
dped Junior Member Last Online: Apr 15th, 2024 19:11 Join Date: Sep 2017 Location: stoke-on-trent	I pick up my 10plate yesterday too so not much time to play with it. But think if you go into your menu there should be light settings that you might be able to change.

Feb 8th, 2018, 08:56	#7
apersson850 Premier Member Last Online: Apr 26th, 2024 13:07 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	They should stay on longer than a few seconds anyway. There's no "center button" either in this model. No, something is wrong. Since they do go on, it doesn't look like it's the door switches. Have you tried with all four doors?

Mar 5th, 2018, 21:22	#8
warninglight VOC Member Last Online: Feb 9th, 2024 15:31 Join Date: Dec 2011 Location: South Lakes	Bit of an update on this now I have VIDA working... CEM B1D1A12 - Interior Lights Circuit "C" - General Electrical Failures - Circuit Short to Battery I've removed the light units to check for any visible damage on the circuit boards, I did see a little bit of corrosion between a couple of connector pins so I cleaned those up, and checked resistance across all the lamps, and they were all fine. I can't dismantle the light units to get at the backs of the PCBs without destroying some plastic welds. I'm wondering if that unit is coded to the car, or if I may be able to swap from a working car to check. Otherwise, how do I get to the CEM to check for any damage that end? VIDA wasn't particularly helpful in showing where it is. __________________ 2008 XC70 SE Lux D5 - 1966 Amazon - 1979 C202 Laplander Past: 1997 S70 TDi, 1997 C70 T5 GT, 2003 V70 Bi-Fuel, 2000 Ph2 V70 2.5D, 1997 V70R Auto FWD, 1998 V70R Manual AWD, 2004 XC90 D5 G/T, 2005 S60 D5

Mar 7th, 2018, 16:25	#9
apersson850 Premier Member Last Online: Apr 26th, 2024 13:07 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	The CEM is in front of the glove compartment.

Mar 7th, 2018, 20:18	#10
warninglight VOC Member Last Online: Feb 9th, 2024 15:31 Join Date: Dec 2011 Location: South Lakes	Is it on the LHS on a RHD car? That was my main query, as any diagrams I've seen pointing to it show LHD cars. __________________ 2008 XC70 SE Lux D5 - 1966 Amazon - 1979 C202 Laplander Past: 1997 S70 TDi, 1997 C70 T5 GT, 2003 V70 Bi-Fuel, 2000 Ph2 V70 2.5D, 1997 V70R Auto FWD, 1998 V70R Manual AWD, 2004 XC90 D5 G/T, 2005 S60 D5

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