first, you need to read the Lamp Fault Code, LFC from the flashing light. Here's how:
Lamp Fault Codes
When the restraints control module (RCM) detects a system fault, it will cause the air bag indicator to flash a coded sequence: a lamp fault code (LFC). The code is two digits. The first digit is flashed with a 0.5 second interval between pulses. There is a 2 second pause before the second digit is flashed, which also has a 0.5 second interval between pulses. There is a 5 second pause between each display of an LFC.
Each LFC is flashed five times after which the air bag indictor will remain lit for the remainder of the key-on cycle. If there are multiple LFCs, each LFC will flash in order of priority.
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The fault could be in the air bag circuits, the canopy circuits, the pretensioner circuit on the seat belts, etc.
Report back with code.
here's some of system.
SECTION 501-20B: Supplemental Restraint System
2003 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION
Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
The air bag supplemental restraint system (SRS) is designed to provide increased collision protection for front seat and second row outboard occupants in addition to that provided by the three-point safety belt system. Safety belt use is necessary to obtain the best occupant protection and to receive the full advantage of the SRS.
This vehicle line contains dual stage deployment (advanced restraint system) driver and front passenger air bag modules. These vehicles can also be equipped with optional safety canopies that deploy from the A-pillar to the C-pillar upon a side impact or if a rollover condition is detected. If equipped with safety canopies, a unique restraints control module (RCM) is used.
See the following illustration for deployable component location.
Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Deployable Components
Item
Part Number
Description
1
611D10
Passenger air bag module
2
042D94
Passenger side safety canopy module
3
042D95
Driver side safety canopy module
4
61203
Driver safety belt buckle and pretensioner
5
043B13
Driver air bag module
6
14A664
Clockspring
7
61202
Passenger safety belt buckle and pretensioner
Item
Part Number
Description
1
14B321
Restraints control module (RCM)
2
14B345
Second row, C-pillar side impact sensor
3
14B345
Second row, C-pillar side impact sensor
4
14B416
Driver seat track position sensor
5
14B345
Front row, driver door, side impact sensor
6
14B006
Front impact severity sensor
7
14B345
Front row, passenger door, side impact sensor
After I posted the question, I found the answer somewhere else. Follow this link.  http://www.volvoclub.org.uk/tech/service...
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