Dtc B1445/45 Front Passenger Seat Side Cool Air Bypass 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 COOL AIR BY-PASS SERVOMOTOR

DTC B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servomotor Circuit


DESCRIPTION

The damper servo (cool air by-pass) 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 damper to any position. As a result, when the A/C is operating, the temperature of the air blowing toward the passenger's head area is controlled.
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
B1445/45
Cool air by-pass damper control servomotor value does not change even if A/C control operated cool air by-pass damper control servomotor
  1. Cool air by-pass damper 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 B1445/45 Front Passenger Seat Side Cool Air Bypass 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
Cool Air Bypass Pulse
(A/B Damp Pls)
Passenger side cool air by-pass pulse /
Min.: 0, Max.: 255
Customized value will be displayed
-
OK:
The display is as specified in the normal condition.

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
REPAIR AIR CONDITIONING AMPLIFIER
A


2.REPLACE COOL AIR BY-PASS 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