Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Air Outlet Damper Control Servo Motor Circuit (Rear) (B1449)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Gasoline Model) / Air Outlet Damper Control Servo Motor Circuit (Rear) (B1449)

DESCRIPTION

The No. 2 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the rear air outlet switching. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1449

Air Outlet Damper Control Servo Motor Circuit (Rear)

Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly
  • No. 2 air conditioning radiator damper servo sub-assembly
  • Air conditioning harness assembly
  • Air conditioning amplifier assembly
  • Air conditioning radiator assembly

Memorized

(30 sec. or more)*
  • *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
DTC Detection Condition Combination Table
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

No. 2 air conditioning radiator damper servo sub-assembly operating

○

○

Malfunction

Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value does not change

○

-

Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value is abnormal

-

○

Detection Time

Continuously for 30 seconds or more

Continuously for 30 seconds or more

Trip Count

1 trip

1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.
  • When installing a damper servo motor, make sure to install it correctly.

    Click here

  • After replacing a damper servo motor, make sure to perform Servo Motor Initialization.

    Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC B1497 is not output

A

DTC B1497 is output

B
B

GO TO DTC B1497

A

2.

INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

Click here

OK:

The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

NG

INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

OK

3.

INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

NG

REMOVE PINCHED WIRE HARNESS
OK

4.

INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the No. 2 air conditioning radiator damper servo sub-assembly.

Click here

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

NG

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

OK

5.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.

Click here

(b) Connect the No. 1 air conditioning radiator damper servo sub-assembly connector to the No. 2 air conditioning radiator damper servo sub-assembly.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(g) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Outlet Servo Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse*

Min.: 128

Max.: 383

Operates between 241 and 348 pulses
  • *: Though this Active Test is for the No. 1 air conditioning radiator damper servo sub-assembly, in this case it is used to check the operation of the No. 2 air conditioning radiator damper servo sub-assembly.
Body Electrical > Air Conditioner > Active Test

Tester Display

Air Outlet Servo Pulse (D)

OK:

The No. 2 air conditioning radiator damper servo sub-assembly operates.

OK

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

NG

REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

    Air Inlet Damper Control Servo Motor (B1442)

    Compressor Solenoid Circuit (B1451)

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