Hi Operation

When the Ignition Switch is in the RUN position, voltage is applied through RR HVAC FUSE to the coil (power side) of the High Blower Relay. When the Rear Auxiliary Heater Control Switch is turned to the "HI" position, ground is supplied from G200 through the closed contacts of the Rear Auxiliary Heater Control Switch to the coil (ground side) of the High Blower Relay. With both power and ground applied to the coil of the High Blower Relay, it energizes and its contacts close. Voltage is applied through the MAXI FUSE and the closed contacts of the High Blower Relay to the Rear Blower Motor. Full system voltage is applied to the Rear Blower Motor. Since the Rear Blower Motor is grounded at G400, the Rear Blower Motor will operate at full speed.