Trailer coupling release

• E90, E91, E92, E93

The trailer coupling can be released from terminal 30g ON. The following signal conditions must be satisfied to allow the coupling to be released:

• Terminal 30g: high signal
• Button: low signal
• Terminal 15: low signal
• Rear lid contact switch: low signal
• Microswitch output 1: low signal
• Microswitch output 2: high signal

The control unit for the trailer coupling release uses the signal conditions to check whether the release procedure can be started. The DC motor is actuated. During release, the outputs at the microswitch change the signal conditions. The indicator lamp lights up red.

While the trailer coupling is released, the loudspeaker emits a continuous tone (E90 to 09/2005) or an acoustic signal is given for a limited time (E90 from 09/2005, E91, E92, E93).

When the trailer coupling is locked in the end position (manually), the outputs at the microswitch change the signal condition again. The indicator lamp lights up green. The loudspeaker is deactivated (E90 up to 09/2005).