GM 19244883
Control Module

You must disconnect the negative battery cable first but maintain an area without loose dirt beside the EHCU because dampening of ABS parts during disassembly is possible. Clean all pollutants from around the EHCU before unconnecting electrical connectors from the ABS Control Module unit. The bolts securing the EHCU mounting bracket to the frame rail can be unfastened and relaxed to allow maneuvering the EHCU downward toward the BPMV where the ABS Control Module mounting screws are located. Before installing the ABS Control Module into the BPMV use gentle pressure only and avoid applying exceeding force that could harm the ABS Control Module. Wipe all mounting surfaces of the BPMV with clean cloth pieces. New screws need to be used for installing a new ABS Control Module and no sealants or RTV solution should be applied to gaskets or mating surfaces of the ABS Control Module. Place the ABS Control Module on the BPMV while tightening new screws at 5 Nm (39 inch lbs.) through an X-pattern. First reconnect the ABS Control Module electrical connectors and also retighten or reinstall the EHCU bracket mounting bolts at 25 Nm (18 ft. lbs.). Finally, reconnect the negative battery cable. The tire calibration must be revised through the Scan Tool Tire Size Calibration function before returning back to the Diagnostic Starting Point of the Antilock Brake System.

First, disconnect the negative battery cable and ensure the area around the EHCU is free from loose dirt to prevent contamination of disassembled ABS components.

Disconnect the negative battery cable and raise the vehicle securely.