Quote:
Originally Posted by osullivant
for this to work should it be work key out? ... battery disconnected?
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You can measure voltage with key on. As volvo_for_ever said, an active LIN bus sits around 7 to 9V DC when measured with a normal multimeter
If shorted you would see something around 0VDC
Tip:
The SWM is active from the moment you press a remote button to unlock the vehicle. And stays active continuously until the vehicle goes into sleep mode around 30s after closing and locking the vehicle, provided no buttons are pressed or functions activated
NOTE
Unplugging anything going to the steering wheel WILL cause an airbag fault to trigger when the steering wheel airbag is no longer detected.
It is not easy or visible to tell when the vehicle is properly asleep - and during any time it has woken up it monitors airbag systems.
So either prepare yourself with VIDA, or do all diagnoses with the vehicle battery disconnected and using an ohmmeter.
Observe battery disconnect precautions:
Remove key, close all doors, open tailgate, wait 10min tailgate light goes off by itself
The the car is asleep and you can disconnect the battery safely.
Always remove negative cable (black).
When reconnecting, the Volvo advice is to have key in PosI, and NO person in any seats (to ensure no airbags will trigger, as they only trigger when the seat is occupied), then attach battery promptly.