B1443

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1443/43: Air Outlet Damper Control Servo Motor Circuit
B1443/43 - 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 A/C amplifier.

The air outlet damper servo motor switches the air outlet mode by rotating (normal, reverse) with electrical power from the A/C amplifier.

When the AUTO switch is on, the A/C amplifier changes the mode between "FACE", "FACE/FOOT" and "FOOT" according to the temperature setting.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to the ON position and turn Techstream on.

(c) Select the items below in the Data List, and read the display on Techstream.

Data List / Air Conditioner:





OK:

When the target position is "FACE" (0%), the actual opening angle is 19.0% or less.

When the target position is "DEF" (100%), the actual opening angle is 81.0% or more.

Result:





C -- REPLACE A/C AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to the ON position and turn Techstream on.

(c) Select the item below in the Active Test and then check that the air flow position by hand.

Active Test / Air Conditioner:





OK:

Air comes out from the selected air outlet.

Result:





C -- REPLACE A/C AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

3. PERFORM ACTUATOR CHECK

(a) Warm up the engine.

(b) Enter the actuator check mode Check Mode Procedure.

(c) Press the DEF switch and change to step operation.

(d) Press the DEF switch and check the air flow by hand.





OK:

Air outlet mode changes in accordance with each display code.

Result:





C -- REPLACE A/C AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

4. INSPECT AIR OUTLET CONTROL SERVO MOTOR

(a) Remove the air outlet control servo motor.





(b) Disconnect the connector from the air outlet control servo motor.

(c) Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "DEF" position smoothly.

OK:

Lever turns to "DEF" position smoothly.

(d) Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turn to the "FACE" position smoothly.

OK:

Lever turns to "FACE" position smoothly.

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

5. CHECK HARNESS AND CONNECTOR (AIR OUTLET CONTROL SERVO MOTOR - A/C AMPLIFIER)

(a) Disconnect the connector from the A/C amplifier.





(b) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE A/C AMPLIFIER