75ZT Community

Trebor · Posted 22 Dec 2014, 19:48 #1

For a while now I have had the bulb warning light on the IPK (Instrument pack (IPK from the German)) which has been showing a fail on both tail lights

The tail lights are fine as are the brake lights ( one filament bulbs for both ) but nevertheless I changed the bulbs but still the same

As one of my number plate lights was also out I was hoping that could be the culprit, and it was the usual PCB (Printed Circuit Board) problem so I have sourced another and that is now fine

However the bulb warning is still on and still showing both tail lights as the issue

All the bulbs in the rear clusters are all working fine, stop and tail, indicator, fog, reversing and all are original bulbs, number plate lights also working fine and original bulbs

The wiring looks ok going into the clusters so does anyone have any ideas what could be the issue ?

PaulT · Posted 22 Dec 2014, 21:16 #2

Think it was Duncan that once replied that the number plate light is not monitored - I may be wrong and if so apologies to Duncan.

raistlin · Posted 22 Dec 2014, 21:33 #3

Perhaps try a battery reset first Rob?

Trebor · Posted 22 Dec 2014, 21:58 #4

Thanks Paul thought about that tonight and will give it a try tomorrow

Duncan · Posted 22 Dec 2014, 22:01 #5

I wonder if there's a bit of dirt on the contacts, or maybe intermittent bulbs? I'm not sure about the number plate bulbs, but I know the front fogs aren't monitored. I'd have to check about the number plate lamps.

Remember the system does 'cold' monitoring, that is checking the bulbs when they are off too. So a bit of dirt or a cracked filament in the bulb can give you fail warnings. I'd try putting in a new bulb or bulbs anyway, and putting a bit of switch cleaner on the contacts of the bulb, and the plug for the lamps anyway.

Mad-Monkey · Posted 22 Dec 2014, 22:03 #6

Number plate lights will cause a bulb fail. My old 190 use to suffer with the PCB.

Jürgen · Posted 22 Dec 2014, 22:04 #7

The number plate lamps will only show up as failed if both of them aren't working anymore.

raistlin · Posted 22 Dec 2014, 22:29 #8

Mad-Monkey wrote:Number plate lights will cause a bulb fail. My old 190 use to suffer with the PCB.

Not on all cars then, as VeeKay once failed MOT for no numberplate lights and there was no indication on my IPK

Trebor · Posted 22 Dec 2014, 22:48 #9

Thanks for the replies will look at dirty contacts tomorrow and report back

Devilish · Posted 23 Dec 2014, 05:35 #10

I could take the amber LED (Light Emitting Diode) out of the IPK, bit of a job but it would fix it.

Mad-Monkey · Posted 23 Dec 2014, 10:45 #11

raistlin wrote:
Mad-Monkey wrote:Number plate lights will cause a bulb fail. My old 190 use to suffer with the PCB.

Not on all cars then, as VeeKay once failed MOT for no numberplate lights and there was no indication on my IPK

I wonder if it was a Facelift addition?

raistlin · Posted 23 Dec 2014, 12:18 #12

Mad-Monkey wrote:
raistlin wrote:
Mad-Monkey wrote:Number plate lights will cause a bulb fail. My old 190 use to suffer with the PCB.

Not on all cars then, as VeeKay once failed MOT for no numberplate lights and there was no indication on my IPK

I wonder if it was a Facelift addition?

No idea David, but I'm sure I had seen it on my previous Y reg CDT.

Trebor · Posted 23 Dec 2014, 12:53 #13

Well after a battery reset all is fine !

raistlin · Posted 23 Dec 2014, 13:56 #14

Trebor wrote:Well after a battery reset all is fine !

Just like re-booting a PC when unspecified gremlins strike

Trebor · Posted 25 Jan 2015, 09:07 #15

Well the bulb warning light soon came back on and I was convinced the bulbs were ok as the failure was showing both tail lights gone yet there was light from both at the back , thats when I discovered what a fool I am !

Yes there was light on both sides but coming from the brake light bulbs which had both come on to compensate for blown tail light bulbs which sit underneath the brake light bulbs in the light unit, so replaced both bulbs and cleaned the contacts and warning light now gone out

I had forgotten how clever these cars can be and would have spotted it sooner had only one tail light bulb blown, but still not sure why both tail light bulbs went at the same time unless it was connected to my accident when I was rear end shunted

takestock · Posted 15 Feb 2015, 19:19 #16

If it helps Rob, I did the exact same thing when I first took ownership of the Typhoon ZT

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Bulb Warning Light - Why ? by Trebor