WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Accumulator View
Courtesy of GENERAL MOTORS CORP.
Install the pressure cycling switch.
Tighten:
Tighten the pressure cycling switch to 4 N.m (35 lb in).
Connect the electrical connection at the pressure cycling switch.