| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001CO05 |
| Model Year Start: 2019 | Model: GR Corolla | Prod Date Range: [06/2018 - 09/2022] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): B1446; Air Mix Damper Control Servo Motor Circuit (Driver Side); 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] | ||
|
DTC |
B1446 |
Air Mix Damper Control Servo Motor Circuit (Driver Side) |
DESCRIPTION
The No. 1 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 No. 1 air conditioning radiator damper servo sub-assembly to the appropriate position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver side is controlled. 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 |
|---|---|---|---|---|
|
B1446 |
Air Mix Damper Control Servo Motor Circuit (Driver Side) |
Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator 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 air conditioning radiator damper servo sub-assembly operating |
○ |
○ |
|
Malfunction |
Damper servo operation request signals are output but the damper position sensor value does not change |
○ |
- |
|
Damper servo operation request signals are output but the 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.
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![2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic 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.
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PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(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, B1443 and B1446 are output |
B |
|
Only B1446 is output |
C |
| A |
|
| B |
|
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY
|
|
|
2. |
INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION) |
(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
OK:
The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
| NG |
|
INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY
|
|
|
3. |
INSPECT NO. 1 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 |
|
|
4. |
INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER) |
(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.
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(b) Operate the dampers by hand.
OK:
The dampers are easily operated by hand.
| OK |
|
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY
|
| NG |
|
REPLACE AIR CONDITIONING RADIATOR ASSEMBLY
|
|
|