2-70
Wipers and Washers
OFF. If the ignition is turned OFF while the wipers are in
mid-cycle, the wipers will stop immediately, regardless
of position. The BCM will park the wipers next time the
ignition is turned ON.
The windshield wiper system MIST operation is
identical to LOW speed operation, except that the MIST
switch is a press and release type switch. When the
wiper switch is moved to the MIST position and
released, low speed wiper motor operation is started
and will continue until 1 cycle is complete. If the wiper
switch is moved to the MIST position and held, the
wiper motor will operate in the LOW speed mode until
the switch is released.
Windshield wiper intermittent operation is a low speed
wiper motor function with a variable delay interval
between the wiper motor cycles. The duration of the
delay is controlled by the front wiper control switches
intermittent 1 thru intermittent 5 settings. The wiper
operation is as follows
1. The BCM will initiate a single wipe by activating its
front wiper ON/OFF relay output.
2. At the completion of a single wipe, the BCM will
park the wipers as described above.
3. The BCM will then pause the wipers in their park
position for the time duration associated with
intermittent delay switch setting.
4. When the delay time expires repeat Steps 1 and 3
until the system is turned off or taken out of
intermittent mode. If the wiper switch is moved
from a longer delay interval to a shorter delay
interval, the BCM will command an immediate wipe
cycle and reset the delay timer to the shorter delay
interval.
Intermittent wiper operation may be vehicle speed
sensitive. When enabled, the speed compensated
intermittent feature causes the intermittent wiper delay
intervals to become shorter as a function of increased
speed. As vehicle speed is reduced the intervals will
become closer to the predetermined
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual
