B1447

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1447/47: Rear Air Mix Damper Control Servo Motor Circuit

DTC B1447/47 - Rear Air Mix Damper Control Servo Motor Circuit

DESCRIPTION

The rear air mix control servo motor (water valve servo motor) is controlled by the A/C amplifier.
The rear air mix control servo motor moves the air mix damper by rotating (normal, reverse) with electrical power from the A/C amplifier.






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 in the Data List, and read the display on Techstream.

Data List / Air Conditioner:





OK:
When the target position is "MAX. COOL" (0%), the actual opening angle is 19.0% or less.
When the target position is "MAX. HOT" (86.5%), 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 the air flow temperature by hand.

Active Test / 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 A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. PERFORM ACTUATOR CHECK
(a) Enter the actuator check mode .
(b) Press the DEF 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 A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
4. INSPECT REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR)





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