| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001H966 |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): B1442; Air Inlet Damper Control Servo Motor; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] | ||
|
DTC |
B1442 |
Air Inlet Damper Control Servo Motor |
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 |
Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-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
CAUTION / NOTICE / HINT
NOTICE:
-
This DTC is also output for the damper link, damper lock, etc. Before performing inspection, perform servomotor initialization and check that there are no mechanical malfunctions.
Click here
![2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): INITIALIZATION](/t3Portal/stylegraphics/info.gif)
-
This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.
Click here
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1497 is output |
A |
|
B1441, B1442 and B1443 are output |
B |
|
Only B1442 is output |
C |
| A |
|
| B |
|
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY
|
|
|
2. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Operate the recirculation/fresh switch.
(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(f) Read the Data List according to the display on the Techstream.
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Air Inlet Damper Targ Pulse |
No. 1 blower damper servo sub-assembly target pulse |
Min.: 128 Max.: 383 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
|
Air Inlet Damper Actual Pulse |
No. 1 blower damper servo sub-assembly actual pulse |
Min.: 128 Max.: 383 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
|---|
|
Air Inlet Damper Targ Pulse |
|
Air Inlet Damper Actual Pulse |
OK:
When the recirculation/fresh switch is operated, the actual pulse changes following the target pulse.
|
Result |
Proceed to |
|---|---|
|
Actual pulse changes following the target pulse |
A |
|
Target pulse changes but actual pulse does not change |
B |
|
Target pulse and actual pulse do not change |
C |
| B |
|
| C |
|
|
|
3. |
CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1442 is not output |
A |
|
B1442 is output |
B |
| A |
|
| B |
|
|
4. |
REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY |
(a) Replace the No. 1 blower damper servo sub-assembly.
Click here
HINT:
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(f) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1442 is not output |
A |
|
B1442 is output |
B |
| A |
|
END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE) |
|
|
5. |
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
(a) Replace the No. 1 air conditioning radiator damper servo sub-assembly.
Click here
HINT:
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(f) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1442 is not output |
A |
|
B1442 is output |
B |
| A |
|
END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE) |
|
|
6. |
REPLACE AIR CONDITIONING HARNESS ASSEMBLY |
(a) Replace the air conditioning harness assembly.
Click here
HINT:
Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(f) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1442 is not output |
A |
|
B1442 is output |
B |
| A |
|
END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE) |
| B |
|
|
|