Dtc B1442/42 Air Inlet Damper Control Servomotor Circuit

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 INLET CONTROL SERVOMOTOR

DTC B1442/42 Air Inlet Damper Control Servomotor Circuit


DESCRIPTION

The damper servo (air inlet control) 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 inlet mode selection air inlet control damper to any position, which controls the intake air settings (FRESH, FRESH / RECIRCULATION and RECIRCULATION).
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
B1442/42
Air inlet damper position sensor valve does not change even if air conditioner amplifier operated air inlet damper control servomotor
  1. Air outlet 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 B1442/42 Air Inlet Damper Control Servomotor Circuit


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 Inlet Damper Targ Pulse
(A/I Damp Targ Pls)
Air inlet damper 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 INLET 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