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Side Marker Bulbs Replaced So Why Still the Message?

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Old Apr 10th, 2021, 14:05   #1
CharlesStevenson
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Default Side Marker Bulbs Replaced So Why Still the Message?

I've replaced the two front side marker bulbs (behind the orange covers) & can see they're working, but I'm still getting the msg appearing & orange triangle when the car's ignition's on.

Interestingly, the check system missed the fact one of the reversing bulbs was blown, so perhaps it's not that accurate?

Is this just 'one of those things' or are there some bulbs elsewhere I need to check?

My V/S40's had rear position markers too but as this S80 doesn't I'm stumped.

Thanks all.
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Old Apr 10th, 2021, 14:54   #2
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If the resistance of the 2 lamps differ greatly a "bulb out" message can occur.
A touch of dielectric grease can help too.
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Old Apr 10th, 2021, 15:13   #3
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@Georgeandkira thx, I'd notice a similar comment on another post when I was searching about these bulbs a few days ago.

All I've done so far is simply used two spares that I knew were 'live' rather than a matched pair. I might buy a new pair too as they're not dear.
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Old Apr 10th, 2021, 17:32   #4
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Did you use standard bulbs or upgrade to LED? A lot of self check systems measure resistance and as LED have absolute minimal resistance they will show as fail ever when operational.

Your choice if you have used LED would be to solder a resistor across it (doubt this is east and you would need to know what value) or replace with standard.
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Old Apr 11th, 2021, 02:06   #5
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Quote:
Originally Posted by XC90Mk1 View Post
Did you use standard bulbs or upgrade to LED? A lot of self check systems measure resistance and as LED have absolute minimal resistance they will show as fail ever when operational.

Your choice if you have used LED would be to solder a resistor across it (doubt this is east and you would need to know what value) or replace with standard.
Good question and no upgrades. All I'd done was replaced the two blown side marker bulbs with two spares from my spare bulb box, so I'm not sure how old they are or whether they're a matched-pair (unlikely).

I'll buy a new pair of "old school" bulbs tomorrow from my local spares shop & see whether I can clear the warning message.
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Old Apr 11th, 2021, 14:23   #6
ASt85
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Default Check the bulb(s)

Quote:
Originally Posted by CharlesStevenson View Post
I'll buy a new pair of "old school" bulbs tomorrow from my local spares shop & see whether I can clear the warning message.
Even though an old bulb might be thought to be "good" it is always as well to check it before installing - those left in glove box emergency kits often get damaged by vibration yet appear OK unless you test them either by measuring their resistance or connecting them across a suitable battery.

Don't forget that side marker lamps/lights also include the 5W bulbs which sit inside the head lamp on many models - they often get missed as they are difficult to see if the dipped beams are set as Daylight Running Lamps.

In the same way, if the one or both 5W rear side markers in each rear cluster are faulty then, as those above, they will produce the message; they look normal if both outer or both inner markers in S60's/V70s/XC70s & etc are blown or indeed if both of the single bulbs in each S80 rear cluster have blown.
In the Left//Right Rear cluster the lamps are
P21/4W
P21W,
PY21W
R5W....(Side Marker )


Fitting Position:
Rear - Left//Right
Light Function:
with indicator, with stop light, with rear fog light, with reverse light, with reflector, with taillight, with side marker light
Supplementary Article/Supplementary Info:
without lamp base
Construction year to:
12/2003
Lamp Type:
P21/4W, P21W, PY21W, R5W
Light Design:
Bulb Technology
Inspection Tag:
E1 1716, ECE
Number of light functions: 7
(Origin = https://www.buycarparts.co.uk/hella/951605 ))
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Last edited by ASt85; Apr 11th, 2021 at 16:34. Reason: Update lamp info
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Old Apr 11th, 2021, 16:47   #7
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Ok, and the problem was caused by ...

The previous owner had only one working rear tailgate bulb in each unit (just as @ASt85 suggested above).

I put a second one in each unit and that cleared the message.

My mistake in not checking the rear straight away but since the front side bulbs were both dead I thought that'd be the issue.

So in case your car's throwing a 'position bulb out' message, check the rear pair on each side too.

HTH
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