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Structure and inner electrical connection

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A diaphragm box is fixed on the exhaust tailpipes of the rear silencer. The diaphragm box is linked to the exhaust flap via an adjustment mechanism. From the electric changeover valve the vacuum hose leads to the diaphragm boxes.

Fig 1: Electric Changeover Valve Exhaust Flap - Circuit Diagram
G09908345Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Electric changeover valve exhaust flap
PIN REFERENCE

Pin Explanation
Terminal 15N Terminal 15, voltage supply
SIG Activation of electric changeover valve