Thread: Disco 4 LED Towing Module Problem

Ok,

I think I see what you mean.

A lot of older stuff I've read talks about "Tow Assist" and how if the car doesn't know you have a trailer then it wont work. To be honest I'm a bit confused by this, should I assume this is just a built in feature that activates itself ? I've read my manual and it doesn't mention it.

Anyway, I'm still unsure why it doesn't work. If the module is working right it should still be receiving the signal from the indicator and sending on the right signal from the tow module to the connector. It is doing the right thing with the brake light and the indicator on-signal, just not switching off during the flashing.

You're right though, the car will still be none the wiser. Is this a bad move ?
I have a separate new Tow Pro also installed as a brake controller.

Steve

Too complex when $12 worth of bits would fix it.

Send it back and grab a refund.

Trailer stability is always there, the indicators will work, it just won't optimise the shifts to compensate.

I will even make you a unit that does work if you like....

It has been said that the D4 will still activate the trailer stability program when required even if it can't detect it via the lights, as the various sensors in the vehicle will detect the extra load of towing a trailer. Without the lights being detected, the vehicle will still raise to off road height automatically with certain Terrain Response settings (whereas with a detected trailer it won't) and the reverse sensors will not deactivate.

The only thing I can think as to why the box isn't working is that the low voltage between flashes may not be low enough for the box to switch off. Honestly, I would remove the module and wire in some 21w load resistors either permanently inline on the trailer plug loom (so they are only in circuit when a trailer is plugged in - only good if you only ever use LED trailer lights) - or on a switch like Chris has done.

The Tow Pro is a good choice on brake controller - has it been installed like is recommended on this thread? http://www.aulro.com/afvb/l319-disco...er-brakes.html

Originally Posted by Stevesonbeans

Ok,

I think I see what you mean.

A lot of older stuff I've read talks about "Tow Assist" and how if the car doesn't know you have a trailer then it wont work. To be honest I'm a bit confused by this, should I assume this is just a built in feature that activates itself ? I've read my manual and it doesn't mention it.

Anyway, I'm still unsure why it doesn't work. If the module is working right it should still be receiving the signal from the indicator and sending on the right signal from the tow module to the connector. It is doing the right thing with the brake light and the indicator on-signal, just not switching off during the flashing.

You're right though, the car will still be none the wiser. Is this a bad move ?
I have a separate new Tow Pro also installed as a brake controller.

Steve

Steve,
Did you install the Tow Pro???
It MUST be installed as per Sniegys instructions.If not there is a fair chance it wont work,or even worse incorrectly wired brake controlers have been known to apply the brakes when the lights come on.It must not be wired to the brake switch wich is the norm in other vehicles.There is a wire that must be cut to prevent euro style tail lighting activating the brakes and a diode to stop any stray current from a faulty trailer brake feeding into and shorting the ECU,EXPENSIVE!!!!
See this thread.If in doubt ask questions,plenty of us here that have done the job.
Sniegy is a Land Rover dealer mechanic and has wired many vehicles.
Andrew

http://www.aulro.com/afvb/l319-disco...er-brakes.html

Close Andy. Shorting the CJB not ECU

Originally Posted by Tombie

Close Andy. Shorting the CJB not ECU

I will go and sit in the naughty corner for 5 mins
Andrew

I did - or correction, a friend who knows what he is doing did....
I stood by and gave moral support. I'll be sure to pass this on so he can check. I've not tested the brakes yet, have been trying to get the bloody lights to work !
Steve

That module looks like it's made for some other purpose - eg it is a trailer control module - which we already have in the disco. Either take up tombie's offer or look up pulse buster or linear electronic design for ready made (almost plug & play) boxes