GM 19244899
Control Module

Starting the ABS Control Module (ABS CM) (W/JL4) replacement process requires users to disconnect the negative Battery Cable followed by securely lifting the vehicle. The ehcu area needs a clean environment to prevent abs component contamination because all contaminants must be washed off. Remove the abs cm from the bpmv by detaching its pressure sensor connector, pressure accumulator switch connector as well as the four mounting screws holding the abs cm in place. Remove the abs cm carefully from the bpmv while keeping track of the jumper harness routes that will be needed for reinstallation. First deactivate the abs cm unit and remove it along with all jumper harnesses from the automotive system. Next separate jumper harnesses from the abs cm part. Use a clean cloth to wipe the surface where the bpmv will be mounted to the abs cm. Jumper harnesses should be fitted to an abs cm before installing the abs cm with jumper harnesses inside the vehicle. New mounting screws are necessary for installing the abs cm to the bpmv while skipping any use of sealant on abs cm mating surfaces and gasket. Fasten the new screws in the abs cm using an x-pattern before securing them to 5 nm (39 inch lbs.). Connect the brake fluid pressure sensor along with pressure accumulator switch electrical connectors while lowering the vehicle before reestablishing the negative Battery Cable. The tire size calibration process with the scan tool tire size calibration function becomes the last step before the diagnostic starting point for antilock brake system.

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.

Disconnect the electrical connectors from the EBCM.