B1441

AIR CONDITIONING SYSTEM: B1441/41: Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DTC B1441/41 - Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The air mix control servo motor (air mix damper servo sub-assembly) is controlled by the A/C amplifier.
The air mix control servo motor moves the air mix damper by rotating (normal, reverse) the motor with electrical power from the A/C amplifier assembly.
This adjusts the mix ratio of the air that passes through the evaporator and heater core and controls the air flow temperature. Air flow temperature changes when moving the air mix damper to the target point. The target point can be detected with the air mix damper position sensor.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch on.
(c) Select the item in the DATA LIST, and read the display on the Techstream.

Air Conditioner





OK:
When the target position is at the "MAX. COOL" (-5%), the actual opening angle is 19.0% or less.
When the target position is at the "MAX. HOT" (105%), the actual opening angle is 81.0% or more.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. PERFORM ACTIVE TEST BY TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch on.
(c) Select the item below in the ACTIVE TEST and then check that the air flow temperature by hand.

Air Conditioner





OK:
When the lever is moved to the "MAX. HOT" side, warm air comes out.
When the lever is moved to the "MAX. COOL" side, cool air comes out.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. PERFORM ACTUATOR CHECK
(a) Set the actuator check mode. Actuator Check

(b) Press the UPDr switch and change to the step operation.
(c) Check the air flow temperature by hand.






OK:
Air flow temperature changes in accordance with each display code.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
4. INSPECT AIR MIX CONTROL SERVO MOTOR





(a) Remove the air mix control servo motor.
(b) Disconnect the connector from the air mix control servo motor.
(c) Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 4, then check that lever turns to "MAX. HOT" position smoothly.
OK:
Lever turns to "MAX. HOT" position smoothly.
(d) Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then check that lever turns to "MAX. COOL" position smoothly.
OK:
Lever turns to "MAX. COOL" position smoothly.
NG -- REPLACE AIR MIX CONTROL SERVO MOTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER ASSEMBLY)





(a) Disconnect the connector from the A/C amplifier assembly.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY