Are you using the factory trailer harness wiring module? If so, perhaps yours is "coded off" for the lamp test.
2002 X5 3.0 361,400 miles
2014 428i 64,000 miles
2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1970 Firebird Under restoration - engine dyno run in August
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