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Hello

There are two mysterious buttons in my LHD car:

First, red, located on the top/left side of driver legs compartment.

Second, black, located on the right side of the fuse&relay box above passenger legs.

Both of them are square.

?

Additional question: It is standard/normal that all cigar lighters are powered while ignition is turned off (in lock/park position, not acc)?
 

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Red one centralized door locking circuit breaker, black one is for Motronic ECU fault code interrogation. Black one is used in conjunction with the trip and cancel buttons to read engine management fault codes stored in the ECU. See http://rrtechnical.info/sz/cs/tsd5069p3.pdf for instructions. Does not need Mastercheck to work.
 
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