Specifications

278
TIPS & HINTS
24
VW-AUDI-SEAT-SKODA
Damage to AD100
Some cases of internal damage to the AD100 have been traced to
a radio wiring fault on VAG vehicles.
VAG cars from 1997 onwards have the ability to code/fault code
read the radio and therefore the diagnostic wire or K line that is
used to connect all of the control units on the car (including the
immobiliser) goes to the radio. If an aftermarket radio has been
fitted, it is possible that this K line may have inadvertently been
shorted to 12v by the after-market adapter harness. This will not
cause any running faults etc with the vehicle, but when you come
along and plug in your AD100 it will fail to communicate and can
end up permanently damaged.
To test for this problem on vehicles later than 1996, either use a
multimeter carry out the following:
Measure the voltage on pin 7 relative to earth with the ignition
and radio on, if it’s below 9 volts then you are OK to connect the
AD100, if it is 12 volts you will need to wire a bulb up between
earth and pin 7. If the bulb does not illuminate it is OK to proceed
with the AD100, however if it illuminates then you have a wiring
fault to the radio DO NOT CONNECT THE AD 100!!!!