B1443

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1443: Air Outlet Damper Control Servo Motor Circuit

DTC B1443 - Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

This circuit turns the servo motor and changes each damper position by receiving the signals from the air conditioning amplifier.
The air outlet damper servo switches the air outlet by rotating the motor (normal, reverse) with electrical power from the air conditioning amplifier.
When the AUTO switch is on, the air conditioning amplifier changes the mode between "FACE", "BI-LEVEL" and "FOOT" according to the temperature setting.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect Techstream to DLC3.
(b) Turn the power switch ON (IG) and Techstream ON.
(c) Select the item below in the Data List, and read the display on Techstream.

Air conditioning amplifier





OK:
When the target position is at the "FACE" (-10.0%), the actual opening angle is 19.0% or less.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM
(a) Connect Techstream to DLC3.
(b) Turn the power switch ON (IG) and turn Techstream ON.
(c) Select the item below in the Data List, and read the display on Techstream.

Air conditioning amplifier





OK:
When the target position is at the "DEF" (110.0%), the actual opening angle is 81.0% or more.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

3. INSPECT AIR OUTLET CONTROL SERVO MOTOR




(a) Remove the air outlet control servo motor.
(b) Connect the battery's positive (+) lead to terminal 4 and negative (-) lead to terminal 5 then check that the lever turns to "FACE" position smoothly.
(c) Measure the resistance of the servo motor.
Standard resistance:





(d) Connect the battery's positive (+) lead to terminal 5 and negative (-) lead to terminal 4 then check that the lever turn to "DEF" position smoothly.
(e) Measure the resistance of the servo motor.
Standard resistance:






NG -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
OK -- Continue to next step.

4. CHECK WIRE HARNESS (AIR OUTLET CONTROL SERVO MOTOR - AIR CONDITIONING AMPLIFIER)




(a) Disconnect the A16 servo connector.
(b) Disconnect the A8 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






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