You need a scantool. however, the light for air bag problems will not turn off unless the problem has actually been corrected.
SOURCE: How do I reset the SRS-Airbag SERVICE URGENT Fault
Here's a quick check list
for most common cost of SRS / Air bag problem.
Dirty contacts on driver
and passenger seat belt buckles
Dirty contacts on seat belt connectors
(under seats)
Dirty contacts on driver and passenger sides weight
sensors (under seat)
Seat covers
Weight on passenger seat
(Example:
grocery package trigger SRS / Air Bag light on the way home.)
I
recommend you to pass an vacuum over the contacts and use CRC
electronic parts cleaner to rule out connectivity problem.
I DO NOT
recommend disconnecting the negative battery connector to clean the code(s).
Without the code(s) the dealer will takes "BILLABLE" time to reproduce
the problem.
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Please rate my answer if it is useful to you.
Cheers,
Mustgo
SOURCE: "SRS-Airbag Service Urgent" Reset procedures
just unhook the battery for about 20 minutes. if you have an anti-theft radio make sure you know the code and how to enter it.
SOURCE: SRS AIRBAG SERVICE 2004 XC-90 MODEL
Most common SRS fault in XC90's is the driver side SIPS bag (side air bag) located in the side of the seat. The wire runs close to the hinge for the backrest and after working back and forth can break or short.
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