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Rear Fogs

Discuss problems you have had or are having with your Z4
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rich48848
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Rear Fogs

Post by rich48848 » Mon Apr 17, 2017 6:03 pm

So after putting some nice new shiny front fogs, I check the lights on the car and notice one of the rear fogs is not on.

Open the access hatch in the boot, find it doesn't give access to the fog bulb... :roll: Remove whole light cluster, extract bulb, bulb is fine.

No corrosion on pins and terminals.

So is there a fuse for one side of the rear fogs?

Anywhere else I need to look? A junction block or something?
Current rides: Z4 coupe, LR Defender, MX5 mk2.5, Austin 16, FV101, FV433, BRDM2
Past rides: Bedford HA van, Skoda Rapide, 405, Fiat Coupe 20VT, BMW M5 e39, Nissan GTR R-35

Dav the wheel nut
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Rear Fogs

Post by Dav the wheel nut » Mon Apr 17, 2017 6:08 pm

There is only one rear fog light on the offside? The other side is a reversing lamp?

rich48848
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Rear Fogs

Post by rich48848 » Mon Apr 17, 2017 6:22 pm

Ha! You nearly had me then! :D

I have two reverse lights and two fogs, only one fog is working.
Current rides: Z4 coupe, LR Defender, MX5 mk2.5, Austin 16, FV101, FV433, BRDM2
Past rides: Bedford HA van, Skoda Rapide, 405, Fiat Coupe 20VT, BMW M5 e39, Nissan GTR R-35

Scooba_Steve
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Rear Fogs

Post by Scooba_Steve » Mon Apr 17, 2017 6:44 pm

This is normal, is in the manual but not massively clear. Only the offside rear fog illuminates, the other is for BFD and LHD.
I'm in the process of changing BFD to flashing brake lights, may try and enable both rear fogs but think one is more useful in fog.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.

rich48848
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Rear Fogs

Post by rich48848 » Mon Apr 17, 2017 7:00 pm

Scooba_Steve wrote: Mon Apr 17, 2017 6:44 pm This is normal, is in the manual but not massively clear. Only the offside rear fog illuminates, the other is for BFD and LHD.
I'm in the process of changing BFD to flashing brake lights, may try and enable both rear fogs but think one is more useful in fog.
Really! And they still fit a bulb???

Well, F me sideways with a trolley jack.... That is well strange. Still, now I know where to find a spare bulb if the other one goes! :rofl:
Current rides: Z4 coupe, LR Defender, MX5 mk2.5, Austin 16, FV101, FV433, BRDM2
Past rides: Bedford HA van, Skoda Rapide, 405, Fiat Coupe 20VT, BMW M5 e39, Nissan GTR R-35

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Rear Fogs

Post by Scooba_Steve » Wed Apr 19, 2017 8:46 pm

It's for the BFD. If you pull the bulb out it will trigger the bulb warning.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.

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Bing
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Rear Fogs

Post by Bing » Wed Apr 19, 2017 8:54 pm

BFD = Brake Force Display.

If you have no lights on at all and hit the brakes REALLY hard, i.e. the ABS system kicks in, then the tail light bars, the 3 brake lights and both fogs light up. It's a very visible warning to any driver behind. If you have tail lights on already because the headlights or sides are on then everything else lights up. I think on the newest models everything flashes instead, from memory of when I followed a friend in a M135i on a spirited drive last year.

I was completely confused at first as well - swapped bulbs over, put new ones in, and even took the light unit off the car to inspect it :oops:
Current... Silver Grey ///M Roadster, non-flimper spec, Imola Red nappa, permanent ear-to-ear grin 8)

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Rear Fogs

Post by Scooba_Steve » Fri Apr 21, 2017 4:36 pm

This also confused a 'specialist' I went to once. I didn't go back
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.

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