Intermittent Wipe Mode

When the control knob on the control stalk of the multi-function switch is moved to one of the five DELAY interval positions the SCM sends an electronic wiper switch delay interval  status message to the SAS. The SAS then relays an electronic wiper switch delay interval  request message to the BCM. The BCM's electronic intermittent wipe logic circuit responds by calculating the correct length of time between wiper sweeps based upon the selected delay interval input.

The BCM monitors the changing state of the wiper motor park switch through a hard wired park switch sense input. This input allows the BCM to determine the proper intervals at which to energize and de-energize the wiper motor intermittently for one low speed cycle at a time.

The BCM logic is also programmed to provide vehicle speed sensitivity to the selected intermittent wipe delay intervals. In order to provide this feature, the BCM monitors electronic vehicle speed  messages from the Controller Antilock Brake (CAB) and doubles the selected delay interval whenever the vehicle speed is about 16 kilometers-per-hour (10 miles-per-hour) or less.