MTC-62
TROUBLE DIAGNOSIS
Revision: January 2005 2004 Quest
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
● Front air control
● Air mix door motors (Front and rear)
● PBR (built-into air mix motors)
System Operation
The front air control receives data from the temperature selected by the driver and rear passenger. The front
air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is applied to
the other circuit, causing the appropriate air mix 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
air mix door positions by measuring the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
The front air mix door motor is attached to the front heater & cooling
unit. The rear air mix door motor is attached to the rear heater &
cooling unit. These motors rotate so that the air mix door is opened
or closed to a position set by the front (or rear) air control. Motor
rotation is then conveyed through a shaft and the air mix door posi-
tion is then fed back to the front air control by the PBR built into the
air mix door motors.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)
1. CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 22 is present.
Yes or No
Yes >> GO TO 2.
No >> GO TO 3.
WJIA0435E
WJIA0496E
WJIA0498E
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