Throttle Actuator Control Module: Removal
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Throttle Actuator Control (TAC) module is located in rear of engine compartment, near underhood fuse block. See Figure. Disconnect TAC module harness connectors. Remove TAC module nuts.