Brake Controller Problems

Submitted: Friday, Aug 03, 2012 at 19:52
ThreadID: 97241 Views:1538 Replies:4 FollowUps:5
This Thread has been Archived
For the electronic Gurus
Have a Tekonsha Voyager brake control fitted to car
Have just noticed when I push the override slide control
the stop lights come on and the auto a gear
all by it self have not checked with van on but I don't think it is normal
any ideas from the gurus

Regards
Phill H
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Reply By: oldpop - Friday, Aug 03, 2012 at 19:53

Friday, Aug 03, 2012 at 19:53
To Quick
should read auto downshifts a gear

Phill H
AnswerID: 492184

Reply By: Paul and Mel - Friday, Aug 03, 2012 at 20:53

Friday, Aug 03, 2012 at 20:53
check LCOOL
AnswerID: 492187

Reply By: Ross M - Friday, Aug 03, 2012 at 21:40

Friday, Aug 03, 2012 at 21:40
Many modern autos drop a gear when you brake. ie from 4th to 3rd. Corolla's do this, so the same feature will be in other vehicles and other makes too. Unfortunately you didn't say what vehicle it is in.

It detects the fact that you have applied the brakes and most likely some reduction in speed too so it is trying to match the vehicle gear to the new road speed. Especially good if you have to accelerate as it is already in the appropriate gear.

Some modern vehicles have four wires on the stop light switch.
2 for the ecu and power in and out for the brakes.
It is possible yours isn't wired exactly as it should be so the lever action doesn't activate the gear change. But it will activate when the pedal is pressed.
However, if it is only a two wire stop switch, it may have to work that way as when you use the lever you are wanting it to reduce speed anyway.
If it is a problem it can be wired with a diode blocking the return current to the switch terminal.
I don't see this as a problem though because you want to stop/slow down and if really using the lever, the box will drop a gear but the trailer will be braking harder than the degree of speed drop of the box = no problem.
AnswerID: 492198

Follow Up By: oldpop - Friday, Aug 03, 2012 at 21:43

Friday, Aug 03, 2012 at 21:43
Ross M
Thanks for the reply car is FZJ105 Cruiser

Phill
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FollowupID: 767838

Follow Up By: Lex M - Friday, Aug 03, 2012 at 22:20

Friday, Aug 03, 2012 at 22:20
A diode blocking the return current to the switch will prevent it from turning on the brake lights which is the way it is designed to work.
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FollowupID: 767847

Follow Up By: donk - Saturday, Aug 04, 2012 at 09:10

Saturday, Aug 04, 2012 at 09:10
When you operate the slide control the brake lights are supposed to come on so that if you are towing and wanted to apply trailer brakes but not vehicle brakes anyone following would be warned that the vehicle and trailer was slowing

Some of the older units used to have a fault where the brake lights would just come on at any time and the diode was one way to prevent this from happening but it stopped the brake light from activating when the slide was used

Regards Don
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FollowupID: 767866

Follow Up By: Ross M - Saturday, Aug 04, 2012 at 12:02

Saturday, Aug 04, 2012 at 12:02
LEX M
You don't want to prevent the brake lights from coming on at all, you want the diode to prevent the unit signal from back feeding to the stoplight switch and thus turning on/activating the gear changedown feature.
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FollowupID: 767871

Follow Up By: Lex M - Saturday, Aug 04, 2012 at 18:18

Saturday, Aug 04, 2012 at 18:18
Maybe I could have worded that better.

A diode installed between the brake controller and the switch terminal will stop the brake lights from turning on.

The way the brake controller turns the brake lights on is via the connection to the brake switch.

Stopping the brake lights from turning on would be dangerous and probably illegal.
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FollowupID: 767901

Reply By: oldpop - Saturday, Aug 04, 2012 at 18:24

Saturday, Aug 04, 2012 at 18:24
Thanks everyone for all the reply's I now know how and why it works

Thanks again

Phill H
AnswerID: 492238

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