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Date:         Fri, 9 Oct 2015 22:26:21 +0000
Reply-To:     Jim Felder <jim.felder@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jim Felder <jim.felder@GMAIL.COM>
Subject:      Re: Help me diagnose and fix no brake lights
Comments: To: "SDF ( aka ,jim lahey' - Scott )" <scottdaniel@turbovans.com>
In-Reply-To:  <56183EC2.4070300@turbovans.com>
Content-Type: text/plain; charset=UTF-8

Let us know if you find that list.

Jim

On Fri, Oct 9, 2015 at 5:25 PM SDF ( aka ;jim lahey' - Scott ) < scottdaniel@turbovans.com> wrote:

> that reminds me .. > somewhere I found, online, a whole list of 'DIN' standards for wiring > diagram symbols and such. > > this list also tells what numbers are used in terminal naming ..1 is > always ground, > 15 is always key on power, etc. Very useful list. > > also that the very beginning of the electrical section of Bentley I think > there's a list of symbols. > > > On 10/9/2015 11:40 AM, Jim Felder wrote: > > Regarding scott's observation that it takes more pressure on the pedal than > you think to operate the brake lights—I cut a 3/4 inch dowel that jams very > tightly between the underside lower steering wheel and the brake pedal. > It's there when you want it, not when you don't, and it puts considerable > pressure on the system. Five minutes on full down is plenty enough to see > if your connections are weeping brake fluid, another benefit. > > Also Scott's observation that the Bentley diagrams require a lot of study, > that's true too. You need it right there as you look and look and look. It > would help to know what all the symbols are, maybe that's in there but I > didn't find it but ended up figuring it out. > > That 4-pin connector that red-black goes through that goes through the > firewall--it has four wires coming in and its mate going to the under dash > harness only has three wires. Go figure why they dead-ended that one wire. > > Jim > > On Fri, Oct 9, 2015 at 4:12 PM vw_van_fan_Mark <madvws@cox.net> <madvws@cox.net> wrote: > > > Only 80-84 vans have the brake failure warning setup. These use 3 wire > switches to supply the signals to the dash warning module and the rear > brake lights. 85-91 vans use 2 wire switches, only for the rear brake > lights. > > For some reason new switch quality seems low and the supply of new 2 > wire switches is even lower. > > Mark > > > SDF ( aka ;jim lahey' - Scott ) wrote: > > re this brake warning light module K ... > ................. > > Obviously the swtiches , one or both I imagine, turn on the brake lights. > the 'other function ' is for a legally required brake failure warning > > light > > in this system I'm pretty sure that if there is a significant difference > in pressures between the two circuits > ( like say a rear wheel cylinder is leaking badly ) .. > the two brake light switches tell this info to the module .. > the module sees 'no pressure in one side' compared to the other > circuit. thus turning on the warning light . > > > > >


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