on the growing sophistication of cars....

[Dave]

to close this out.  i checked a bunch of batteries directly using a voltmeter and they all registered over 3 volts.  using the 100ohm resistor across the the cell yielded markedly different results, in some cases barely about half (around 2 volts).

the end result was 6 batteries thrown out.  

+1 for this method. i wish i'd known about it before.

dave
'08 rs6 avant
'12 vw passat alltrak


> On 25/02/2015, at 6:25 pm, PSD <psdooley at verizon.net> wrote:
> 
> Thank you for sharing that.
> A note on those little button cells- test for voltage with a resistor across
> the DVM leads, like 100-200 ohms.  If not, they can show much higher voltage
> than what they actually have, kind of like a surface charge.
> http://www.candlepowerforums.com/vb/showthread.php?311628-What-CR2032-open-c
> ircuit-voltage-is-considered-quot-dead-quot
> 
> 
> 
> -----Original Message-----
> From: quattro [mailto:quattro-bounces at audifans.com] On Behalf Of Dave Eaton
> Sent: Tuesday, February 24, 2015 3:44 PM
> To: quattro at audifans.com
> Subject: on the growing sophistication of cars....
> 
> my wagon has ³advanced key² which means that it provides keyless entry.
> which can be surprisingly handy.  so last month, after a long holiday away
> the keyless bit wasn¹t working.  so i swapped the battery out of the remote
> with a new battery.  still no joy.  use my other keys and get intermittent
> results.  replace the battery in the other unit.  still intermittent at
> best.  sometimes even the remote locking/unlocking functions would not work
> until i had pressed the remote 6-7 times.
> 
> if i take it to the dealer, i them become a hostage to their diagnosis, and
> this is stuff i should be able to figure out myself.  sigh.
> 
> i access vag-com.  i am seeing multiple 955/966 errors but they are recorded
> as intermittent.
> 
> access elsawin.  try to understand the interface of advanced key with normal
> remote lock/unlock as the failure mode is influencing both. there are 3
> aerials one in each rear door and one in the trunk.  there is a reader unit
> under the dash and a precessing unit under the centre console.  to get
> access to all that gubbins would not be the work of a moment.  check out the
> wiring diagrams, there is a common ground or 2 but nothing obvious that
> would contribute to the failure mode that i am seeing short of a fundamental
> system failure.  there is some talk on the internet of how a faulty door
> aerial could cause the others to stop working.  could be door wiring.  the
> failure occurs irrespective of which side of the car i am accessing.
> mentally prepare myself for $500 labour and $500 parts bill from the dealer.
> 
> with vag-com i run control element diagnostics on the start module and note
> that all tests pass with not faults logged.
> 
> i finally follow a hunch and and replace both remote batteries again with
> new ones from the supermarket.
> 
> it all works like a charm.  $6.
> 
> and a bad batch of cr2032 batteries that is now in the trash.
> 
> dave
> ¹08 rs6 avant
> ¹12 vw passat alltrak
> 
> 
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