Some claim to have experienced Climate Control Module malfunction after just disconnecting and reconnecting the battery. If you you pay attention, you can notice the sensor fan running behind the small grille in the climate unit. If you close the door and wait for exactly 1 minute, you will hear a relay click and the fan shuts down. I would recommend to wait at least until this fans shuts down before you disconnect the battery.
When I open the driver door on my 2005 XC70, the fan starts again. I advice to close the door, and then wait at least 1 minute. The tailgate door can be open, so you can actually sit in the back and wait for the click sound.
Even so, VIDA states the following:
Warning! The SRS (supplemental
restraint system) is active for a certain time after the power is cut. Therefore
wait three minutes before starting work.
When reconnecting the battery, VIDA says you have to put the key in position II before you reconnect the battery. I guess this helps to drain the voltage spikes in a way. This is what VIDA says:
Warning! The key must be in
position 2. No one must be in the car when the battery is connected. This is a
safety precaution in case an airbag module activates when the power is
connected.
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