Reverse Gear Input

The reverse gear input is used by the navigation computer to distinguish between the vehicle backing up or turning around.

• E38/E39/E52/E53: The reverse input is a high signal produced by the LCM III.
  Fig 1: Reverse Gear Input Signal Flow Chart (E38/E39/E52/E53)

  Courtesy of BMW OF NORTH AMERICA, INC.
• E46: The reverse input is a high signal supplied by a splice from the back-up lights.
  Fig 2: Reverse Gear Input Signal Flow Chart (E46)

  Courtesy of BMW OF NORTH AMERICA, INC.