Lingenfelter L300090607 Lingenfelter Suburban Yukon Aux Fan Kit ECM Fan Control 2005-07 v1.0 - Manual (Page 14)

Page 13.
45. To disconnect the engine harness from the
module, first release the orange locking tab and
then move the connector release arm forward to
release the connector.
46. Disconnect both connectors from the ECM.
47. Remove the module from the vehicle and
ship to LPE.
Contact LPE prior to shipping the ECM to
LPE for proper shipping instructions. Be sure
to provide the VIN and any other important
information regarding the vehicle.
44. With the battery disconnected, remove the
ECM (Engine Control Module) from the vehicle.
The ECM is located on the driver side, just below
the fuse box and behind the production fan
assembly.