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JellyBean

Member Since: 02 Mar 2015
Location: Suffolk
Posts: 142

Rear fog lamp not working

So, I replaced the head unit in my Defender and all is working well with exception of the rear fog lamp. Neither the small light on the switch or the lamp itself comes on. Everything else is as it was in working order. What might I have done?

17th Aug 2015 3:36pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Unplugged the switch maybe? Ray
My build thread
http://www.defender2.net/forum/topic17615.html

17th Aug 2015 3:49pm

JellyBean

Member Since: 02 Mar 2015
Location: Suffolk
Posts: 142

Ray - I thought that myself, but when I checked the switch it was plugged in and so far as I can see is as it should be.

17th Aug 2015 4:53pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Got a multimeter?

Check fuse 26 rated at 10 amps. There is also a rear fog lamp ecu. Ultimately a voltage check at the fuse output and at the light will tell what's going on or not as the case may be.

The system is earth switched on the switch pin4 or header point K109 terminal 14 if either of these are detached this too would cause your symptoms. It may 'look and feel' plugged in but is the circuit compromised? If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

17th Aug 2015 4:56pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19574

Worth checking the connector on the rear of the switch is firmly pushed home too.
I assume you already have done this though..

17th Aug 2015 5:32pm

scotiach

Member Since: 19 Nov 2014
Location: 5603
Posts: 36

2015 Defender 110 Puma 2.2 SW Scotia Grey

Don't want to suggest something so simple but the light and switch only illuminate when the lights are on. I also thought I had done something wrong here when I installed the HU, but then realised my light on/off confusion.

18th Aug 2015 9:05am

JellyBean

Member Since: 02 Mar 2015
Location: Suffolk
Posts: 142

Scotiach - thank you! That's was EXACTLY my error too - all is now well.

And thank you everyone else - fortunately not too complex a problem, although I feel like a lemon ...

18th Aug 2015 5:50pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

at least it's sorted

Ray
My build thread
http://www.defender2.net/forum/topic17615.html

18th Aug 2015 6:44pm

Kretchman

Member Since: 07 Sep 2021
Location: Auckland
Posts: 5

2008 Defender 90 Puma 2.4 SW Indus Silver

scotiach wrote:
Don't want to suggest something so simple but the light and switch only illuminate when the lights are on. I also thought I had done something wrong here when I installed the HU, but then realised my light on/off confusion.

Life saver. You just saved me 50 quid.

8th Nov 2021 6:05am

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