Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001XL1Y
Model Year Start: 2022 Model: Camry Prod Date Range: [08/2021 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1442; Air Inlet Damper Control Servo Motor Circuit; 2022 - 2024 MY Camry [08/2021 -        ]

DTC

B1442

Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The No. 1 blower 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 inlet damper to the appropriate position to change the air inlet mode (fresh, recirculation/fresh, and recirculation).

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

B1442

Air Inlet Damper Control Servo Motor Circuit

Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly
  • No. 1 air conditioning radiator damper servo sub-assembly
  • Air conditioning harness assembly
  • Air conditioning amplifier assembly
  • Blower 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. 1 blower damper servo sub-assembly operating

Malfunction

Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change

-

Air inlet damper servo operation request signals are output but the air inlet 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

for Dual Type

for Single Type

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 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: BLOWER UNIT: REASSEMBLY

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

    Click here 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): INITIALIZATION

PROCEDURE

1.

CONFIRM MODEL

Result

Proceed to

for Dual Type

A

for Single Type

B

B

GO TO STEP 10

A

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

Only DTC B1497 is output

A

DTC B1441, B1442, B1443 and B1446 are output

B

Only DTC B1442 is output

C

A

GO TO DTC B1497

B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

C

3.

INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

The No. 1 blower damper servo sub-assembly is installed correctly.

NG

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY CORRECTLY

OK

4.

INSPECT NO. 1 BLOWER 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

5.

INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Remove the No. 1 blower damper servo sub-assembly.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: BLOWER UNIT: DISASSEMBLY

(b) Operate the air inlet dampers by hand.

OK:

The air inlet dampers are easily operated by hand.

NG

REPLACE BLOWER ASSEMBLY

OK

6.

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (STE2) - 3 (sigB)

Always

Below 1 Ω

5 (STE1) - 2 (sigA)

Always

Below 1 Ω

8 (M-) - 5 (M-)

Always

Below 1 Ω

7 (M+) - 4 (M+)

Always

Below 1 Ω

4 (GND) - 1 (GND)

Always

Below 1 Ω

6 (STE2) or 3 (sigB) - Other terminals and Body ground

Always

10 kΩ or higher

5 (STE1) or 2 (sigA) - Other terminals and Body ground

Always

10 kΩ or higher

8 (M-) or 5 (M-) - Other terminals and Body ground

Always

10 kΩ or higher

7 (M+) or 4 (M+) - Other terminals and Body ground

Always

10 kΩ or higher

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

OK

7.

CONFIRM MODEL

Result

Proceed to

w/ Rear Center Register

A

w/o Rear Center Register

B

B

GO TO STEP 9

A

8.

PERFORM ACTIVE TEST USING TECHSTREAM

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

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

Click here 2021 - 2024 MY Camry [10/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT: DISASSEMBLY

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

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch to ON.

(f) Turn the Techstream on.

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

(h) 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 Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse*

Min.: 128

Max.: 383

Operates between 220 to 256 pulses

  • *: Though this Active Test is for the No. 1 blower 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 Inlet Damper Targ Pulse

OK:

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

OK

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

9.

PERFORM ACTIVE TEST USING TECHSTREAM

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

(b) Connect the No. 1 blower damper servo sub-assembly connector.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(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 Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 220 to 256 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Inlet Damper Targ Pulse

OK:

The No. 1 blower damper servo sub-assembly operates.

OK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

10.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

Only DTC B1497 is output

A

DTC B1441, B1442 and B1443 are output

B

Only DTC B1442 is output

C

A

GO TO DTC B1497

B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

C

11.

INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

The No. 1 blower damper servo sub-assembly is installed correctly.

NG

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY CORRECTLY

OK

12.

INSPECT NO. 1 BLOWER 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

13.

INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Remove the No. 1 blower damper servo sub-assembly.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: BLOWER UNIT: DISASSEMBLY

(b) Operate the air inlet dampers by hand.

OK:

The air inlet dampers are easily operated by hand.

NG

REPLACE BLOWER ASSEMBLY

OK

14.

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (STE2) - 3 (sigB)

Always

Below 1 Ω

5 (STE1) - 2 (sigA)

Always

Below 1 Ω

8 (M-) - 5 (M-)

Always

Below 1 Ω

7 (M+) - 4 (M+)

Always

Below 1 Ω

4 (GND) - 1 (GND)

Always

Below 1 Ω

6 (STE2) or 3 (sigB) - Other terminals and Body ground

Always

10 kΩ or higher

5 (STE1) or 2 (sigA) - Other terminals and Body ground

Always

10 kΩ or higher

8 (M-) or 5 (M-) - Other terminals and Body ground

Always

10 kΩ or higher

7 (M+) or 4 (M+) - Other terminals and Body ground

Always

10 kΩ or higher

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

OK

15.

PERFORM ACTIVE TEST USING TECHSTREAM

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

(b) Connect the No. 1 blower damper servo sub-assembly connector.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(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 Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 220 to 256 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Inlet Damper Targ Pulse

OK:

The No. 1 blower damper servo sub-assembly operates.

OK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY