Dtc B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side)

Heater & Air Conditioning System. Lexus Gs430, Gs300. Uzs190 Grs190
Air Conditioning. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

REPLACE AIR MIX CONTROL SERVOMOTOR

DTC B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side)


DESCRIPTION

The air mix damper servo sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (passenger seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing temperature.
HINT:
Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DTC No.
DTC Detection Condition
Trouble Area
B1441/41
Air mix damper position sensor value does not change even if air conditioner amplifier operates air mix control servomotor
  1. Air mix control servomotor
  2. Smart connector (Air conditioning harness)
  3. A/C amplifier

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Air Conditioning.Air Conditioning System. Dtc B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side)


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and push the intelligent tester main switch on.

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


A/C amplifier:
Item
Measurement Item / Display
(Range)
Normal Condition
Diagnostic Note
Air Mix Servo Targ Pulse (P)
(Air Mix Pulse - P)
Passenger side air mix servomotor target pulse /
Min.: 0, Max.: 255
Customized value will be displayed
-
OK:
The display is as specified in the normal condition.

Result:
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.REPLACE AIR MIX CONTROL SERVOMOTOR
HINT:
Since the servomotor cannot be inspected while it is removed from the vehicle, replace the servomotor with a normal one and check that the condition returns to normal.
OK:
Same problem does not occur.


OK
END
NG

REPLACE AIR CONDITIONING HARNESS