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Re: Brake Light Timing Circuitry

To: Bob <s1500@worldnet.att.net>
Subject: Re: Brake Light Timing Circuitry
From: Jjcousins@ra.rockwell.com
Date: Mon, 21 Jun 1999 08:47:35 -0400
More info on why I'm asking.  It's probably a CDO thing but...

since a few days ago, my brake light will turn on for a fixed amount of time
if...(and I think this is true) there's a
change in current flow EVEN WITH THE CAR OFF!!!  For example the following
things cause the brake light to come on
for about 5 seconds and then turn off (with the car off):

* hitting the horn (sometimes)
* turning ON the lights
* turning OFF the lights
* opening a door with a couple of accessory lights on (sometimes)

What the heck????   I looked under the driver's seat for any loose wires near
the handbrake wire connector thing and couldn't find the handbrake wire.  I
disconnected mine a couple of years ago since the connector had failed.  I did
find a loose wire under there but grounding this one
caused the Fasten Seat Belt light to turn on, so I knew it wasn't this one.

Could it be the seat belt buzzer thing under the dash?  I have disconnected the
grounding connector under the steering column because
the buzzer was enemic and horrible sounding.

Oh, also when driving, the Brake light will flicker sometimes and do the 5
seconds pulsing at other random times during a drive...

Goblins?

Please help.

Thanks in advance - John Cousins 1977 Spitfire





Bob <s1500@worldnet.att.net> on 06/19/99 10:03:12 PM

To:   John J Cousins/Cleveland/RA/Rockwell
cc:   spitfires@autox.team.net
Subject:  Re: Brake Light Timing Circuitry




On Fri, 18 Jun 1999 Jjcousins@ra.rockwell.com wrote:

> When I start the car, the brake and
> (I think) the Fasten Seat Belt lights both
> come  on for a few seconds.  What timing
> circuitry is doing this?

The seatbelt warning light is controlled by the
time/buzzer module on the interior bulkhead.
The light & buzzer will operate (momentarily)
only if the seatbelt is not fastened when you
first crank the car.
FWIW the timer/buzzer is easily disconnected.

Assuming the handbrake is OFF, the brake
warning light illuminates while the key is
in the "crank" position to provide a lamp
test.  There's no timer here.  Of course the
lamp should also light if the handbrake is
on, or if the PDWA sense hydraulic problems.

Hope this helps,
Bob (& '78 Spitfires)





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