| VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here. |
November 17th, 2019, 15:26
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#1
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Veteran Member
Join Date: Jul 2011
Location: Sorel, Canada
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Replaced brake light switch and fuse 13, still coding with bad switch
Hi guys, I just replaced my brake light switch and changed fuse 13, my brake lights are now working but the glow plug light is still flashing and when I scan with my VAGCOM, it still gives me a bad brake light switch.
Any idea what's wrong?
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November 17th, 2019, 23:57
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#2
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Veteran Member
Join Date: Jul 2007
Location: Portland, effing Oregon
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Did you try just clearing the code?
Some codes go away on their own after so many miles, too.
__________________
2003 Jetta TDI 1.9L 5-speed
Malone Dynamic EGR ~ cooler delete ~ Euro pipe ~ ventectomy
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November 18th, 2019, 13:23
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#3
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Veteran Member
Join Date: Jul 2011
Location: Sorel, Canada
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Quote:
Originally Posted by STDOUBT
Did you try just clearing the code?
Some codes go away on their own after so many miles, too.
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Yes I tried, many times. I keeps coming back.
Today it stopped and came back later on  !
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November 18th, 2019, 13:58
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#4
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Veteran Member
Join Date: Oct 2017
Location: OR
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What exactly is the code?
__________________
Whatever. Just use your darned blinker. And stay off your phone.
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November 18th, 2019, 19:27
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#5
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Veteran Member
Join Date: Jul 2011
Location: Sorel, Canada
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Quote:
Originally Posted by Nero Morg
What exactly is the code?
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I don't have the exact fault message from VCDS but it's:
Brake Light Switch (F): Implausible Signal
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November 19th, 2019, 03:32
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#6
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Veteran Member
Join Date: Nov 2013
Location: Lawrenceville PA
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November 19th, 2019, 06:19
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#7
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Veteran Member
Join Date: Jul 2011
Location: Sorel, Canada
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Quote:
Originally Posted by Tdijarhead
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Yup!!
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November 19th, 2019, 10:52
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#8
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not-a-mechanic
Join Date: May 2004
Location: central Ohio
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First thing in the wiki-
Possible Causes
- Wiring and/or Connectors faulty
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November 22nd, 2019, 08:43
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#9
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Newbie
Join Date: Nov 2019
Location: Utah
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I just went through this. My solution was fuse 43 was missing. But that seems to be uncommon.
More common fixes are fixing brake light bulbs that went out, and making sure you have the right bulbs in the tail light.
Ensuring proper function of the switch with a multimeter. One red wire gets 12v and the other connects to it when the brake is pressed. The white wires are connected when the brake is released, and disconnected when the pedal is pressed.
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