GSIC - Global Service Information Center

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

for Preparation Click here

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	Cool air by-pass damper control servomotor Smart connector (Air conditioning harness) A/C amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

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

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

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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.

END

REPLACE AIR CONDITIONING HARNESS