Audi A6L car airbag warning
A 2012 year Audi A6L with mileage of about 23,000 km, the car airbag warning.
Diagnosis:
1, Using the VAS 5054A ODIS 2.2.4 read 15 have fault code: 9444649 B 101 D29 [137] belt switch, passenger side, unreliable signal.
2, Check the line properly, try replacing the belt switches, the fault can not be ruled out. Since the airbag control unit can not be replaced, order a new control unit, can not be encoded after installation, find out has a software management code XCHG15AO05, after upgrade also can not be encoded, upgrade again, display can only upgrade once.
3, Consulting researchers, told the airbag control unit is locked, VAS 5054A authority is not enough, use VAS 5054A directly programmed into coding, fault resolution.
4, After the vehicle stopped one night, airbag lamp lights up again, displayed the side of copilot airbag static fault, check the lines and contact normal, again after all the airbag system installed properly, the fault becomes sporadic, can be cleaned, and then place one day fails again appears and can not be cleared.
5, Analysis, the new control unit should not be damaged, focused on checking the wiring harness pins and the contact (as shown Figure 1), recall previously processed A4B6 airbag system are all pin contact poor, open pin can not see fault by the naked eye, try 31,32 pin to pry tightly by tool, observed after installed, fault resolution.
Fault resolution: use VAS 5054A and diagnostic software ODIS. After deal with airbag control unit pin, fault resolution.
VAS5052A authority is not enough, it can not be encoded, but use VAS 5054A with ODIS under normal circumstances can be encoded. Because for airbag alarm, check the wiring harness, plug several times airbag computer plug, causing some pins loose, naked eye can not distinguish, will appears secondary failure, so when repair must be careful to plug airbag system wiring harness, moving as little as possible.
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