DRL bulb failure
- Papa Bear
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DRL bulb failure
A few weeks ago I had the dash warning saying a bulb was out, was a DRL.
Replaced both with these
https://www.ebay.co.uk/itm/283047985879
2 days ago I got the warning again, checked and one bulb blown. Tried swapping bulbs side to side and holder to holder but the fault followed the bulb. Filaments look fine and work on sidelight. Contacted seller and they asked for a photo of th3 bulb so just been to take it out and now both aren’t working. Checked with a multimeter on the bulbs and they have continuity so maybe not blown. I’ll try them in the rear tomorrow but hoping one of you geniuses might have an idea what’s going on
Please
Replaced both with these
https://www.ebay.co.uk/itm/283047985879
2 days ago I got the warning again, checked and one bulb blown. Tried swapping bulbs side to side and holder to holder but the fault followed the bulb. Filaments look fine and work on sidelight. Contacted seller and they asked for a photo of th3 bulb so just been to take it out and now both aren’t working. Checked with a multimeter on the bulbs and they have continuity so maybe not blown. I’ll try them in the rear tomorrow but hoping one of you geniuses might have an idea what’s going on
Please
Caddy Maxi Life 1.6TDI 7 speed DSG 102bhp
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- Giddy
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Re: DRL bulb failure
If they are connecting to the contacts inside the sockets ok, then perhaps something to do with the bulb resistance. Maybe it's too low and the BCM shut the output off to prevent itself from blowing up.
- Papa Bear
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Re: DRL bulb failure
Cheers @Giddy, Could that happen on normal bulbs as opposed to leds?
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- Giddy
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Re: DRL bulb failure
Yes, I've seen bulbs like this. They visually look ok and have continuity when measured, but do not light up.
- Papa Bear
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Re: DRL bulb failure
Ok thanks, off to Halfords in the morning to pick up some bog standard ones
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Re: DRL bulb failure
Sometimes if you spin em 180° they work?
- Papa Bear
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Re: DRL bulb failure
Offset bayonet, won’t fit the other way round, tried it
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Re: DRL bulb failure
Ah...!
- C Chis
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DRL bulb failure
Hi [mention]Papa Bear [/mention]
A quick check on the resistance of the bulbs might help.
Assuming a 12 volt, 21w/5w lamp
Power = Volts*Amps
21w = 1.75 Amps
5w = 0.42 Amps
Resistance (Ohms) = Volts/Amps
21w = 6.8 Ohms
5w = 28.6 Ohms
So, you should be getting approximately the above resistance values across the filament between the +ve pin and the outer -ve metal casing
Short your multimeter leads together before taking the lamp readings and if it doesn’t read zero add the value on the display to any readings you take across the bulbs
Note: avoid touching the probe ends with your bare hands in case your multimeter range is on high or you can get false readings due to the resistance of your body
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A quick check on the resistance of the bulbs might help.
Assuming a 12 volt, 21w/5w lamp
Power = Volts*Amps
21w = 1.75 Amps
5w = 0.42 Amps
Resistance (Ohms) = Volts/Amps
21w = 6.8 Ohms
5w = 28.6 Ohms
So, you should be getting approximately the above resistance values across the filament between the +ve pin and the outer -ve metal casing
Short your multimeter leads together before taking the lamp readings and if it doesn’t read zero add the value on the display to any readings you take across the bulbs
Note: avoid touching the probe ends with your bare hands in case your multimeter range is on high or you can get false readings due to the resistance of your body
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- Papa Bear
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Re: DRL bulb failure
Twin filament bulbs so first bulb
Between outside and one terminal about 6 ohms
Between outside and second terminal about 640 ohms
Between the bottom terminals about 700 ohms
Second bulb
Between outside and one terminal about 4 ohms
Between outside and second terminal about 1100 ohms
Between the bottom terminals about 1100 ohms
eBay seller says “I tend to hear back from customers about the caddy's having problems“
Have offered replacement but as one bulb didn’t work when they arrived and had that replaced already I’m thinking these are not a good purchase
Between outside and one terminal about 6 ohms
Between outside and second terminal about 640 ohms
Between the bottom terminals about 700 ohms
Second bulb
Between outside and one terminal about 4 ohms
Between outside and second terminal about 1100 ohms
Between the bottom terminals about 1100 ohms
eBay seller says “I tend to hear back from customers about the caddy's having problems“
Have offered replacement but as one bulb didn’t work when they arrived and had that replaced already I’m thinking these are not a good purchase
Caddy Maxi Life 1.6TDI 7 speed DSG 102bhp
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- C Chis
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Re: DRL bulb failure
Yip, dud’s!
Most likely a crack in the sealing compound letting water in and causing resistance issues.
The resistance between the 2 bottom terminals should be the sum of both the readings as your circuit is made from terminal 1 through the filament to the casing and back through filament 2 to terminal 2.
I’d be sending them back asking for a full refund and try another manufacturer
Most other vehicles without the active error checking wouldn’t show any faults other than perhaps a dim bulb until the moisture had been driven off with the heat of the bulb.
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Most likely a crack in the sealing compound letting water in and causing resistance issues.
The resistance between the 2 bottom terminals should be the sum of both the readings as your circuit is made from terminal 1 through the filament to the casing and back through filament 2 to terminal 2.
I’d be sending them back asking for a full refund and try another manufacturer
Most other vehicles without the active error checking wouldn’t show any faults other than perhaps a dim bulb until the moisture had been driven off with the heat of the bulb.
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2010 pre-facelift Mk3 3.2 VR6 : Touran Interior : 3D Premium Clocks : R32 Bumper : Climatic A/C
My VR6 Build Thread and Details can be Found Here
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- Papa Bear
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- Posts: 1885
- Joined: Sun Mar 01, 2020 10:44 pm
- Engine size/power: 1.6 CR TDI (102bhp)
- Location: Hampshire, UK
Re: DRL bulb failure
Thanks mate, asking for a refund now. Must find the post on here that recommended them and leave a comment
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- Papa Bear
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- Location: Hampshire, UK
Re: DRL bulb failure
Seller has come back with
“Hi the ohms on bulbs must be tested with running 12v through them
Many try to test resistance without any power and that is not correct for the bulbs”
“Hi the ohms on bulbs must be tested with running 12v through them
Many try to test resistance without any power and that is not correct for the bulbs”
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- C Chis
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Re: DRL bulb failure
Sellers talking rubbish!,
You can measure the voltage and the current of a live circuit and use those figures to calculate the resistance (Ohm's Law) by using the calculations in the previous posts, however you can't actually measure the resistance of a live circuit as the voltage will interfere with the reading (simple answer).
If they’re not willing to refund, I’d be putting in a claim via PayPal.
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You can measure the voltage and the current of a live circuit and use those figures to calculate the resistance (Ohm's Law) by using the calculations in the previous posts, however you can't actually measure the resistance of a live circuit as the voltage will interfere with the reading (simple answer).
If they’re not willing to refund, I’d be putting in a claim via PayPal.
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2010 pre-facelift Mk3 3.2 VR6 : Touran Interior : 3D Premium Clocks : R32 Bumper : Climatic A/C
My VR6 Build Thread and Details can be Found Here
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- Papa Bear
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- Engine size/power: 1.6 CR TDI (102bhp)
- Location: Hampshire, UK
Re: DRL bulb failure
Pretty much what I said to them. It’s a shame I already left positive feedback
Waiting for reply from them
Waiting for reply from them
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