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HOMESERVICE MANUALSBMW1992325IS AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSELECTRONIC TRANSMISSION - OVERVIEWSYSTEM COMPONENTSTRANSMISSION CONTROL MODULE
1992 BMW 325is Automatic

Transmission Control Module

1992 BMW 325is AutomaticSECTION Transmission Control Module

The TCM receives inputs, processes information and actuates the output elements to provide optimal shift points. See Fig 1 . The TCM is programmed for maximum shift comfort and fuel economy. The TCM on most BMW vehicles is located in the E-Box next to the ECM (DME). There are several types of TCM housings:

  • 35 Pin TCM (TCU) - used on the 4HP transmissions.
  • 55 Pin TCM - used on the A4S310R (THM-R1).
  • 88 Pin TCM - used on all others up to 1998.
  • 134 Pin TCM - used on all BMW transmission from the 1999 model year. (Note- the 134 pin TCM was introduced on the 1998 Models equipped with the A5S440Z).
    Fig 1: Electrical System Components
    G00317068Courtesy of BMW OF NORTH AMERICA, INC.
The 134 Pin TCM is also referred to as SKE (Standard Shell Construction). The SKE housing uses 5 separate connectors. On transmission applications only three connectors 1, 3 and 4) are used. Connectors 2 and 5 are blank and are NOT used. The connectors are blue in color to avoid confusion with the ECM (DME) connectors which are black. See Fig 2 .

Fig 2: Identifying Transmission Control Module & Connectors
G00317069Courtesy of BMW OF NORTH AMERICA, INC.
RENDER: 1.0x

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