Another light question - warning light on... - MG-Rover.org Forums
 
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post #1 of 14 (permalink) Old 22-11-2016, 08:20 Thread Starter
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Another light question - warning light on...

My blown bulb warning light is permanently on. I've checked all of the lights, and they're all ok. Any ideas? (One was blown, but was replaced several days ago now).

Will this be an MoT issue if not resolved?
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post #2 of 14 (permalink) Old 22-11-2016, 10:07
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Check the rear /tail bulbs. If one fails, the corresponding brake bulb will be used at reduced voltage. It's not always obvious unless you look carefully. The tail lights each side will shining be from different positions in the lamps. Also check the numberplate bulbs.

TC
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post #3 of 14 (permalink) Old 23-11-2016, 07:28 Thread Starter
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Originally Posted by T-Cut View Post
Check the rear /tail bulbs. If one fails, the corresponding brake bulb will be used at reduced voltage. It's not always obvious unless you look carefully. The tail lights each side will shining be from different positions in the lamps. Also check the numberplate bulbs.

TC
Nope, double-checked last night. All lamps illuminated. #puzzled. Any thoughts on the MoT issue?
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post #4 of 14 (permalink) Old 23-11-2016, 09:07
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Is there an led bulb somewhere?
From autobulbs about their led bulbs: "These bulbs are CAN-Bus compatible, meaning they can communicate with the ECU on modern cars, meaning the correct bulb behaviour, and preventing the bulb-out warning lights on your dash."
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post #5 of 14 (permalink) Old 23-11-2016, 09:21 Thread Starter
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Is there an led bulb somewhere?
From autobulbs about their led bulbs: "These bulbs are CAN-Bus compatible, meaning they can communicate with the ECU on modern cars, meaning the correct bulb behaviour, and preventing the bulb-out warning lights on your dash."
No again. Tried one on the wife's 45 once - no warning light, but the bulb flickered constantly.
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post #6 of 14 (permalink) Old 23-11-2016, 18:30
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So did the warning light occur immediately when you replaced the bulb ?

(One was blown, but was replaced several days ago now).
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post #7 of 14 (permalink) Old 24-11-2016, 08:50 Thread Starter
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So did the warning light occur immediately when you replaced the bulb ?

(One was blown, but was replaced several days ago now).
Yes, it basically just stayed on, i.e. it was on to show that a bulb had failed, and never went out even after replacing the bulb.
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post #8 of 14 (permalink) Old 24-11-2016, 09:11
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Maybe worth doing the 20 minutes off battery disconnection ritual. It seems to resolve lots of electrical issues, but not all by any means.

Check the usual precautions before doing this.

TC
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post #9 of 14 (permalink) Old 24-11-2016, 10:35 Thread Starter
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Maybe worth doing the 20 minutes off battery disconnection ritual. It seems to resolve lots of electrical issues, but not all by any means.

Check the usual precautions before doing this.

TC
Which leads to a very obvious next question!
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post #10 of 14 (permalink) Old 24-11-2016, 11:13
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OEM satnav? Run the full shutdown procedure.
Radio code? Make sure you have it and know how to enter it if necessary.
Other DIY accessories requiring constant power?
There may be others I can't recall, but it's all on record if you look for it.
Perhaps use a 'code keeper' type battery gizmo in the cigar lighter?

TC
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post #11 of 14 (permalink) Old 24-11-2016, 11:31
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TOAF?
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post #12 of 14 (permalink) Old 24-11-2016, 16:45
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TOAF?
I'd love to know. Can you tell us?

TC
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post #13 of 14 (permalink) Old 24-11-2016, 16:51
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I'd love to know. Can you tell us?

TC
My car failed its MOT on a number plate bulb. Its the first time I've ever let a garage do my MOT work cost me 9 but saved me from having to re-book and bring it back.

But I thought it strange the car hadn't told me about it.
I ran TOAF and sure enough it flagged it up as an error
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post #14 of 14 (permalink) Old 26-11-2016, 16:58
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If you still have the issue with the warning light, I've had a couple of issues, which I solved which may help you:
1). Remove the rear light bulb holder unit, reove all the bulbs and clean the contact points of the holder with a fibreglass pen, this will remove any surface corrosion which may be giving a high resistance (had this issue a few times).
2). separate the rear light wiring loom plug, again, clean the prongs on the plug and spray with a switch cleaner (it took me ages to solve this problem the first time it happened!)

Hope this helps,

Steve
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