Volkswagen reports that some 2012-14 Jetta GLI and Passat models may turn on the air bag warning lamp and log trouble codes B200009, B200049 and/or U101200 in the SRS system.
One possible cause for the trouble, says the German carmaker, is resonance from the alarm horn causing electrical interference with the air bag control module.
The problem occurs most frequently during the SRS system self-test. Installing a special alarm suppression kit (Part No. 5C6998003, Jetta GLI; Part No. 561054620B, Passat) and replacing the air bag module with an updated design with new software, Part No. 5C0959655, should eliminate further trouble.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].
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