Dtc B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side)

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (AIR MIX SERVO TARG PULSE (D))

REPLACE AIR MIX CONTROL SERVO MOTOR

DTC B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side)


DESCRIPTION

The air mix damper servo sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the air mix damper (driver seat) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air.
HINT:
Confirm that there are no mechanical problems because this DTC can be output when either a damper link or damper is mechanically locked.

DTC No.
DTC Detection Condition
Trouble Area
B1446/46
Air mix damper position does not change even if air conditioning amplifier operates air mix control servo motor
  1. Air mix control servo motor
  2. Air conditioning harness
  3. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side)


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (AIR MIX SERVO TARG PULSE (D))

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the intelligent tester main switch ON.

  1. Select the items below in the Data List, and read the value displayed on the intelligent tester.


Air conditioning amplifier:

Item
Measurement Item / Display (Range)
Normal Condition
Diagnostic Note
Air Mix Pulse-D
Driver side air mix servo motor target pulse /
Min.: 0, Max.: 255
Customized value displayed
-
OK:
The display is as specified in the normal condition column.

Result:

Result
Proceed to
NG
A
OK (Checking from PROBLEM SYMPTOMS TABLE)
B
OK (Checking from DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.REPLACE AIR MIX CONTROL SERVO MOTOR
HINT:
Since the servo motor cannot be tested when it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.
OK:
Same problem does not occur.


NG
REPAIR OR REPLACE AIR CONDITIONING HARNESS
OK

SYSTEM IS OK