KICKDOWN Switch

The TCM receives a kickdown request via one of two possible methods:

• The kickdown signal is a direct ground input to the TCM. The kickdown input is provided by a kickdown switch located under the accelerator pedal. See Fig 1 . This method is used on most BMW vehicles without electronic throttle control systems (except M52TU with MDK).
  Fig 1: Identifying Kickdown Switch Location

  Courtesy of BMW OF NORTH AMERICA, INC.
• The kickdown request is provided by the ECM (DME) via the CAN bus. The kick down request originates from the PWG. There is no separate switch in the PWG. When the PWG voltage reaches approximately 4.5 volts, the ECM will process a kickdown request to the TCM via CAN. The PWG contains a kickdown detent to simulate the feel of a kickdown switch. This method is used on the M62TU, M54, M73, M73TU, N73 and N62 engines. See Fig 2 .
  Fig 2: Identifying Kickdown Switch Circuit

  Courtesy of BMW OF NORTH AMERICA, INC.