2007 Buick Rainier Transmission Control Module

You should disconnect the negative battery cable, disconnect the cooling fan electrical connector for additional clearance while removing the TCM, depress the engine control module (ECM)/TCM cover retainers, remove the ECM/TCM cover from the ECM/TCM bracket, release the bracket TCM retainer, tilt the TCM away from the ECM/TCM bracket, remove the TCM from the TCM bracket, remove the ECM, the ECM/TCM bracket retaining bolts, and the ECM/TCM bracket from the vehicle frame.

You should install the ECM/TCM bracket retaining bolts, insert the TCM into the retaining slot of the ECM/TCM bracket, Install the ECM/TCM cover to the ECM/TCM bracket, ensure the ECM/TCM cover retainers are fully engaged with the ECM/TCM bracket, connect the cooling fan electrical connector, and connect the negative battery cable.