Disco 4 and van lights

Submitted: Thursday, Jul 25, 2013 at 20:32
ThreadID: 128854 Views:8041 Replies:5 FollowUps:1
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Hi does anyone have the answer for the Disco 4, 7 pin outlet not working with the BT running, parking and stop light system? Despite using a coiuple of makes of 7-12 converter cables the Disco 4 system will not function with the BT (or other vans for that matter) - very frustrating!

Both Landrover and a number of auto-electricians cannot point to a viable solution.

What experience do BOG members have?


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Reply By: braggy - Friday, Jul 26, 2013 at 01:47

Friday, Jul 26, 2013 at 01:47
What they don't work at all ?, there can be an issue with LEDs on the trailer, but other lights work, just not dash indicator

There is a plug LH rear panel (where tow adaptor is/was ) , but dealer should have looked at that., they do need soft ware upgrade for tow kit from new , but dealer would know that

Have they ever worked ?

Cheers Ken
AnswerID: 586202

Reply By: Noosa Fox - Friday, Jul 26, 2013 at 05:19

Friday, Jul 26, 2013 at 05:19
With the new Ford Ranger they require an adapter for trailers that are fitted with LED lights as the LED do not draw enough current for the vehicles system to recognise.

As the previous comment mentioned LED's this may well be a similar problem with the Disc, so you may need to contact Landrover for advice.

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AnswerID: 586203

Reply By: Free & Easy - Friday, Jul 26, 2013 at 10:05

Friday, Jul 26, 2013 at 10:05
The D4 is wired to EU standard with separate tail light feeds for left and right side.
They use two separate wires for the side lights (left and right, Blue and Brown I think). The brown goes to the pin (5) we use for the electronic brake controller. If the brown is not disconnected when your electronic brake controller is installed, and remains connected the right tail light circuit will try to operate the electronic brakes on the BT when lights come on. Will probably draw too much current and blow fuse, so lights wont work.

D4 brake controller

The landrover forum discusses correct installation of brake controller in thread above.
Should be no issue once elecronic brake controller is installed correctly and right tail light circuit removed. Might need to check fuses after is is removed

AnswerID: 586204

Follow Up By: Free & Easy - Friday, Jul 26, 2013 at 10:42

Friday, Jul 26, 2013 at 10:42
Its the brown that goes to pin 5 the one we use for electronic brake circuit. This needs to be disconnected from the tail light circuit and the pin freed up for use br electronic brake controller.
FollowupID: 855289

Reply By: Elsey - Saturday, Jul 27, 2013 at 02:33

Saturday, Jul 27, 2013 at 02:33
If you follow the wireing instructions as set out on the AULRO site you will not have any problems. As well as cutting the brown wire for the brake controller you need to run your earth wire bact to one of the two earth posts on the mud guard inner just in front of the battery box. Also fit a 3 amp diode into the red wire just before it exits from the LHR to the outside, remember to make sure the kathode end (the side with the stripe on it) faces the Electric Trailer Brake unit (front of the vehicle). The installation of the diode will prevent any feed back to the Central Junction Box in the event of the controller failing.

The AULRO site provides a wealth of infromation for owners of all models of Land Rover vehicles.
AnswerID: 586205

Reply By: Searenity - Tuesday, Jul 30, 2013 at 23:54

Tuesday, Jul 30, 2013 at 23:54
Hi Fellow BOGGERS,
thanks for your various views on my Disco 4 issue - it seems to be a well known and common issue - as the vehicle is under warranty and is leased, methinks the local Landrover dealer has some explaining and fixing to do.


AnswerID: 586206

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