C 3500 Truck 2WD V8-454 7.4L VIN J SFI (1999)
position consistent with the signals voltage. The voltage corresponds to the control dial selection on the selected control module. CKT 454 (WHT) and
CKT 1199 (DK BLU) carries variable voltage from the Auxiliary HVAC Control Logic Module to the Auxiliary Mode Door Motor and Auxiliary
Temperature Door Motor respectively. These motors adjust position proportionately to the input voltage provided.
