Posted to Technical Discussion Forum on 2/19/2014
Parasitic draw on 07 Jetta
Here is an interesting story about a parasitic draw on a
2007 VW Jetta.
The customer complaint was about a dead battery if the
vehicle sat for more than two days. The vehicle already had
a new battery in it when it got here.
We hooked up our low amp probe to the battery cable and
verified an unusual parasitic draw that surged up and down
between 150 mA and 900 mA.
This draw occurred with the doors,trunk and hood closed and
the vehicle locked with the key out of the car. The draw
went on continuously, cycling up and down until the battery
We noticed that when the driver's door was opened, the
interior lights did not come on, which they did when any
other door was opened. We pinpointed a defective microswitch
in the driver's door latch assembly and thought this might
cause a parasitic draw.
A new driver's door latch assembly (which contains the
microswitch) was installed. Now the interior lights worked
properly when the driver's door was opened. The parasitic
draw, however, was unchanged.
After a lot of troubleshooting we discovered that
disconnecting the driver's door module (integral with the
window lift motor) would stop the parasitic draw.
A new driver's door module was ordered, by VIN from the
local VW dealer. The new module arrived in a ripped up box
with extra shipping labels on it. We installed it anyway and
coded it with using Vag-Com with the same coding as the
original DDM (Driver's Door Module).
Now the fun starts, since the new module would not allow any
of the power windows on the car to work and it also set a
trouble code, 01811 for supply voltage low.
Looking closely at the part # on the original DDM showed it
to be 1K0-959-701P. The new part # was 1K0-959-701L
We called the VW dealer parts dept. and asked them to verify
if this was the correct part. Yes, they assured us, it is
the correct part number, only superceded, but maybe its
Another DDM was ordered and arrived two days later. This one
was also in a previously opened box with extra shipping
labels on it. The part # was identical to the one they had
just sent and it did the same as the previous module, which
is set code 01811 and not work anything. There was no
parasitic draw with the new module, but its hard to call
something fixed when no door functions are working.
Now we noticed that the pin arrangement (and there are many
pins) on the new module was different than on the original.
Some pins on the new module were missing.
I called the dealer and asked them to look into the problem.
They then sent me an interesting internal VW bulletin which
"Due to further technical development the latest generation
door control units are UDS(Unified Diagnostic Service, a new
generation communication protocol) compatible are available
for repair. In individual cases, there may be communication
problems with the newly fitted door control unit during
diagnosis and connection.
Corrective measure: Please install a KWP (Key-Worl
Protokoll)/UDS compatible diagnosis interface gateway."
Long story short, they said I would have to install both
front door modules with the new "superseded" part numbers,
plus install a "gateway module" behind the OBD 11 connector.
The parts cost was into 4 figures!
The tech help line at Ross-Tech then drew my attention to a
redirect file that showed an incredible 15 different part #s
for the driver's door modules!
The best solution,they advised , was to find a used DDM with
the exact same part number. Many calls to wrecking yards
finally resulted in a match (1K0-959-701P) which when
installed and coded, resulted in a door module that worked
all door functions and most importantly stopped our
parasitic draw. [2007 Volkswagen Jetta 2.5,
BATT/Charging/Starting Photo] The first picture shows the
original DDM on the left with two new incorrect DDM's sent
to me by VW. [2007 Volkswagen Jetta 2.5, Photo] The
file picture shows just how many variations there is on this
Hope this helps someone else.
Mark from Ontario
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25 Replies Received