Mode Door Motor Circuit
Mode Door Motor CircuitSYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
Inspection Flow:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
- Front air control
- Mode door motor
- PBR (built into mode door motor)
- In-vehicle sensor
- Ambient sensor
- Optical sensor
- Intake sensor
System Operation
The mode door position (vent, B/L, foot, and defrost) is set by the front air control by means of the mode door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit. In AUTO mode the mode door position is set by the front air control which determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature selected by the driver or passenger.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It rotates so that air is discharged from the outlet as indicated by the front air control. Motor rotation is conveyed to a link which activates the mode door.
Diagnostic Procedure For Mode Door Motor (Steps 1 - 3):
Diagnostic Procedure For Mode Door Motor (Steps 4 - 7):
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR