[V8] No rear brake light wackyness
Scott Simmons
indischrot at gmail.com
Wed Oct 10 13:48:22 PDT 2007
The brake light switch gets its power from a 25 am fuse, through a
red/blue wire to the switch, and red/black takes that power ..er..
elsewhere. Verify 12V at the red/blue wire on the brake light switch
(at the pedal). This power is also going to the Shift Lock warning
buzzer... so is that the one that yells at you if you're in drive and
open the door?
As far as brake switch failures, if they don't back out then the problem
is usually a bad spring on the inside that doesn't let the button pop
out and doesn't connect the two lines, thus no lights.
Dumb question: You checked continuity on the bright filiment on both
bulbs, right?
Another dumb quetsion: You checked for 12V at both terminals in the
bulb socket, right?
In sum: check for 12V at the red/blue wire at the brake light switch.
~Scott S.
Ron Wainwright wrote:
>You know how I'm stupid whenh it comes to
>this......how would I "jump the switch"?
>
> Ron
>
>--- Scott Phillips <Scottp at ippe.com> wrote:
>
>
>
>>Ron.. if you just jump the switch the lights should
>>come on
>>
>>Scott
>>
>>-----Original Message-----
>>From: v8-bounces at audifans.com
>>[mailto:v8-bounces at audifans.com] On Behalf
>>Of Ron Wainwright
>>Sent: Wednesday, October 10, 2007 3:46 PM
>>To: Ingo Rautenberg
>>Cc: v8 at audifans.com
>>Subject: Re: [V8] No rear brake light wackyness
>>
>>Ok, again I just checked the Black switch & with the
>>pedal pressed in or not the circuit tester doesn't
>>light up.
>> So I'll replace the Black switch & see what
>>happens.
>>
>> Thanx
>>Ron
>>
>>--- Ingo Rautenberg <ingo.rautenberg at gmail.com>
>>wrote:
>>
>>
>>
>>>Ron, I believe the black one is for the brake
>>>
>>>
>>lights
>>
>>
>>>and the clear is
>>>for the cruise control interrupt switch. The one
>>>for the brake
>>>lights works such that when the brake pedal is
>>>depressed the switch,
>>>which is normally closed, is opened and when open
>>>the contacts inside
>>>are closed. So make sure you're checking the
>>>
>>>
>>right
>>
>>
>>>way! Usual
>>>failure mode IME is the brake lights don't turn
>>>
>>>
>>off
>>
>>
>>>-- and that's
>>>because the hold-down nut is worn and the switch
>>>closes the circuit
>>>and the brake lights stay on all the time. I
>>>
>>>
>>haven't
>>
>>
>>>seen the actual
>>>switch fail either. But that's from memory. I'd
>>>check but I broke my
>>>right leg tibia bone Sunday afternoon. No
>>>driving/wrenching ANYTHING
>>>for me for a while :-(
>>>
>>>Ingo
>>>
>>>On Oct 10, 2007, at 3:18 PM, Ron Wainwright wrote:
>>>
>>>
>>>
>>>>I did check the switches at the back of the
>>>>
>>>>
>>brake
>>
>>
>>>>pedal...there's a Black one & Clear/White
>>>>
>>>>
>>>one..which
>>>
>>>
>>>>do I check. But anyway....
>>>>...I put a circuit tester on the wires there &
>>>>
>>>>
>>the
>>
>>
>>>>circuit tester doesn't light up..as I mentioned
>>>>
>>>>
>>in
>>
>>
>>>my
>>>
>>>
>>>>original post.
>>>> But not sure why those would be bad...I've
>>>>
>>>>
>>never
>>
>>
>>>had
>>>
>>>
>>>>to replace them in any Audi I've owned.
>>>>
>>>> Ron
>>>>
>>>>--- Ingo Rautenberg <ingo.rautenberg at gmail.com>
>>>>
>>>>
>>>wrote:
>>>
>>>
>>>>>Ron,
>>>>>
>>>>>Did you check for continuity in the circuit
>>>>>
>>>>>
>>from
>>
>>
>>>the
>>>
>>>
>>>>>brake light
>>>>>socket to the brake light switch? That'll tell
>>>>>
>>>>>
>>>you
>>>
>>>
>>>>>if there's a
>>>>>problem in between. You may indeed have a bad
>>>>>switch (you should
>>>>>have plenty of spares in your depot).
>>>>>
>>>>>Best of luck.
>>>>>
>>>>>Ingo
>>>>>
>>>>>On Oct 10, 2007, at 2:44 PM, Ron Wainwright
>>>>>
>>>>>
>>>wrote:
>>>
>>>
>>>>>>The turn signal & hazards work as they should.
>>>>>>
>>>>>>
>>>>>It's
>>>>>
>>>>>
>>>>>>the brakes that don't work. The dual filament
>>>>>>
>>>>>>
>>>bulb
>>>
>>>
>>>>>>lights up one of the filaments when I turn the
>>>>>>
>>>>>>
>>>>>HL's
>>>>>
>>>>>
>>>>>>on...but when pushing on the brake pedal the
>>>>>>
>>>>>>
>>>other
>>>
>>>
>>>>>>filament doesn't lite up. Totally different
>>>>>>
>>>>>>
>>bulb
>>
>>
>>>>>from
>>>>>
>>>>>
>>>>>>the turn signal/hazard bulb. & the rear
>>>>>>
>>>>>>
>>light's
>>
>>
>>>in
>>>
>>>
>>>>>the
>>>>>
>>>>>
>>>>>>windshield obviousley don't work eather...just
>>>>>>
>>>>>>
>>>for
>>>
>>>
>>>>>the
>>>>>
>>>>>
>>>>>>record.
>>>>>>
>>>>>> UPDATE....I pulled the fuse box & everything
>>>>>>
>>>>>>
>>>>>looks
>>>>>
>>>>>
>>>>>>good, all the connectors are were there
>>>>>>
>>>>>>
>>supposed
>>
>>
>>>>>to
>>>>>
>>>>>
>>>>>>be, ect. The reason I mention this is cause a
>>>>>>
>>>>>>
>>>>>lister
>>>>>
>>>>>
>>>>>>mentioned I may have to change out
>>>>>>
>>>>>>
>>>>>fusebox's.....but I
>>>>>
>>>>>
>>>>>>don't think it's a fusebox issue..remember
>>>>>>
>>>>>>
>>when
>>
>>
>>>>>>pushing on the horn..which is tied into the
>>>>>>
>>>>>>
>>same
>>
>>
>>>>>>circuit the Logic
>>>>>>relay for P/N-lock (relay possision 15) &
>>>>>>
>>>>>>
>>relay
>>
>>
>>>>>for
>>>>>
>>>>>
>>>>>>back-up-lights (possision 14) in the second
>>>>>>
>>>>>>
>>tier
>>
>>
>>>>>of
>>>>>
>>>>>
>>>>>>relay's, they click.
>>>>>>
>>>>>> Ron
>>>>>>
>>>>>>--- sdewitt at stx.rr.com wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Somewhere in all that mess, is tied into the
>>>>>>>
>>>>>>>
>>>>>hazard
>>>>>
>>>>>
>>>>>>>light switch circuit. might want to check
>>>>>>>
>>>>>>>
>>that,
>>
>>
>>>>>as I
>>>>>
>>>>>
>>>>>>>recall, both the hazard and the turn signals
>>>>>>>
>>>>>>>
>>>are
>>>
>>>
>>>>>the
>>>>>
>>>>>
>>>>>>>same bulb.
>>>>>>>
>>>>>>>----- Original Message -----
>>>>>>>From: Ron Wainwright <ron_01056 at yahoo.com>
>>>>>>>Date: Wednesday, October 10, 2007 12:48 pm
>>>>>>>Subject: [V8] No rear brake light wackyness
>>>>>>>To: v8 at audifans.com
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Listers, small problem with my rear brake
>>>>>>>>lights...THEY DON'T WORK!
>>>>>>>>
>>>>>>>>So I check the fuses & while didling with
>>>>>>>>
>>>>>>>>
>>fuse
>>
>>
>>>>>>>>#3....horn/brake lights/P-lock buzzer/2nd &
>>>>>>>>
>>>>>>>>
>>>3rd
>>>
>>>
>>>>>>>stage
>>>>>>>
>>>>>>>
>>>>>>>>fan relay...I can see it lighting up, or
>>>>>>>>
>>>>>>>>
>>>>>arching,
>>>>>
>>>>>
>>>>>>>&
>>>>>>>
>>>>>>>
>>>>>>>>while pushing the horn in I hear & feel the
>>>>>>>>
>>>>>>>>
>>>>>Logic
>>>>>
>>>>>
>>>>>>>>relay for P/N-lock & relay for
>>>>>>>>
>>>>>>>>
>>back-up-lights
>>
>>
>>>>>>>click.
>>>>>>>
>>>>>>>
>>>>>>>>All bulbs are good, license plate lights
>>>>>>>>
>>>>>>>>
>>light
>>
>>
>>>>>up,
>>>>>
>>>>>
>>>>>>>>hazards work, turn signals work, ect...just
>>>>>>>>
>>>>>>>>
>>no
>>
>>
>>>>>>>brake
>>>>>>>
>>>>>>>
>>>>>>>>lights.
>>>>>>>>
>>>>>>>>I all so checked the brake switches at the
>>>>>>>>
>>>>>>>>
>>>>>pedal,
>>>>>
>>>>>
>>>>>>>but
>>>>>>>
>>>>>>>
>>>>>>>>couldn't get eather to light up with a
>>>>>>>>
>>>>>>>>
>>circuit
>>
>>
>>>>>>>>tester...is that my problem...the pedal
>>>>>>>>
>>>>>>>>
>>>>>switches?
>>>>>
>>>>>
>>>>>>>>I replaced both relays in the pannel as
>>>>>>>>
>>>>>>>>
>>well,
>>
>>
>>>>>but
>>>>>
>>>>>
>>>>>>>>they still click.
>>>>>>>>
>>>>>>>>Any help would be great since in 2 weeks
>>>>>>>>
>>>>>>>>
>>I'll
>>
>>
>>>be
>>>
>>>
>>>>>>>>dropping the car off in MN to it's owner.
>>>>>>>>
>>>>>>>>
>=== message truncated ===
>
>
>
>
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