Step 1: Begin by disconnecting the power to your dishwasher at the main circuit breaker. The dishwasher should be unplugged from the wall prior to commencing work.
Step 2: Then, the access panel will need to be detached from the dishwasher. This panel is typically found on the bottom front of the appliance. The screws securing the panel should be removed and then the panel should be carefully pulled away from the dishwasher.
Step 3: At this point, the spray arm will need to be found. It is situated at the bottom of the dishwasher and should be easily identifiable. Once located, the mounting bolts should be unscrewed and the arm should be carefully taken off.
Step 4: Your new Bosch 11011645 spray arm should be taken and inserted into position. It should be fastened with the mounting bolts, ensuring they are secure.
Step 5: The access panel should be reattached and the power restored. Your dishwasher should be tested to confirm that the spray arm is functioning correctly.
Please remember, these instructions serve as general guidance and should always be used alongside the manufacturer's manual, if available.