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On Board Computer Stuck on Outside Temp

Discussion in 'E39 (1997-2003)' started by schmittp, Jun 24, 2012.

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    E39 (2001 525i) On Board Computer does not cycle thru functions when BC tip of turn signal stalk level is depressed. It stays stuck on displaying only the outside temperature (B21 / X770). I couldn't find anything in TIS online forum, and my Bentley manuals don't shed much light on troubleshooting (Vol. II, ELE-441 to ELE-445 seem to apply). Any thoughts on what to try next? I suspect it's not a lamp/bulb for fuse problem, because the Temperature display on the instrument console in fine and correctly sensed. The radio works fine, so no onboard monitor impact there.
    - Thanks for any help, Paul

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