| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z3Y |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B143B7F; Air Inlet Damper Control Servo Motor Actuator Stuck Off; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
B143B7F |
Air Inlet Damper Control Servo Motor Actuator Stuck Off |
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 No. 1 blower damper servo sub-assembly to the appropriate position to change the air inlet mode (fresh, recirculation/fresh, and recirculation).
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B143B7F |
Air Inlet Damper Control Servo Motor Actuator Stuck Off |
Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Memorized |
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
![2023 - 2025 MY Corolla Corolla HV [09/2022 - ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): 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 NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION) |
(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.
Click here
OK:
No. 1 blower damper servo sub-assembly is installed correctly.
| NG |
|
|
|
2. |
CHECK BLOWER DAMPER SERVO SUB-ASSEMBLY NO.1 (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 |
|
|
3. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Inlet Damper Control Servo Motor |
This test activates the air inlet damper control servo motor. (No. 1 blower damper servo sub-assembly) |
128: Min 384: Max |
Operate with the ignition switch ON. |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Inspection Item |
|---|---|---|---|---|
|
Air Inlet Damper Control Servo Motor Actual Pulse |
No. 1 blower damper servo sub-assembly actual pulse |
128 to 384 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
Body Electrical > Air Conditioner > Active Test
|
Active Test Display |
|---|
|
Air Inlet Damper Control Servo Motor |
|
Data List Display |
|---|
|
Air Inlet Damper Control Servo Motor Actual Pulse |
OK:
The value of the Data List changes in accordance with the operation of the Active Test.
| NG |
|
|
|
4. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Inlet Damper Control Servo Motor |
This test activates the air inlet damper control servo motor. (No. 1 blower damper servo sub-assembly) |
128: Min 384: Max |
Operate with the ignition switch ON. |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Inspection Item |
|---|---|---|---|---|
|
Air Inlet Damper Control Servo Motor Target Pulse |
No. 1 blower damper servo sub-assembly target pulse |
128 to 384 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
|
Air Inlet Damper Control Servo Motor Actual Pulse |
No. 1 blower damper servo sub-assembly actual pulse |
128 to 384 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
Body Electrical > Air Conditioner > Active Test
|
Active Test Display |
|---|
|
Air Inlet Damper Control Servo Motor |
|
Data List Display |
|---|
|
Air Inlet Damper Control Servo Motor Target Pulse |
|
Air Inlet Damper Control Servo Motor Actual Pulse |
OK:
The target pulse value of the Data List matches the actual pulse.
| OK |
|
|
|
5. |
INSPECT AIR CONDITIONING HARNESS ASSEMBLY |
(a) Disconnect the m4 No. 1 air conditioning radiator damper servo sub-assembly connector.
(b) Disconnect the m1 No. 1 blower damper servo sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
m4-1 (M-) - m1-5 (M-) |
Always |
Below 1 Ω |
|
m4-2 (M+) - m1-4 (M+) |
Always |
Below 1 Ω |
|
m4-3 (STE2) - m1-3 (STE2) |
Always |
Below 1 Ω |
|
m4-4 (STE1) - m1-2 (STE1) |
Always |
Below 1 Ω |
|
m4-5 (GND) - m1-1 (GND) |
Always |
Below 1 Ω |
|
m4-1 (M-) or m1-5 (M-) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
m4-2 (M+) or m1-4 (M+) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
m4-3 (STE2) or m1-3 (STE2) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
m4-4 (STE1) or m1-2 (STE1) - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
|
|
6. |
REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY |
Click here
|
|
7. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Inlet Damper Control Servo Motor |
This test activates the air inlet damper control servo motor. (No. 1 blower damper servo sub-assembly) |
128: Min 384: Max |
Operate with the ignition switch ON. |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Inspection Item |
|---|---|---|---|---|
|
Air Inlet Damper Control Servo Motor Actual Pulse |
No. 1 blower damper servo sub-assembly actual pulse |
128 to 384 |
|
No. 1 blower damper servo sub-assembly circuit malfunction |
Body Electrical > Air Conditioner > Active Test
|
Active Test Display |
|---|
|
Air Inlet Damper Control Servo Motor |
|
Data List Display |
|---|
|
Air Inlet Damper Control Servo Motor Actual Pulse |
OK:
The value of the Data List changes in accordance with the operation of the Active Test.
| OK |
|
END |
| NG |
|
|
8. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Front Air Outlet Damper Control Servo Motor |
This test activates the front air outlet damper control servo motor. (No. 1 air conditioning radiator damper servo sub-assembly (front mode)) |
128: Min 384: Max |
Operate with the ignition switch ON. |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Inspection Item |
|---|---|---|---|---|
|
Front Air Outlet Damper Control Servo Motor Actual Pulse |
No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse |
128 to 384 |
|
No. 1 air conditioning radiator damper servo sub-assembly (front mode) circuit malfunction |
Body Electrical > Air Conditioner > Active Test
|
Active Test Display |
|---|
|
Front Air Outlet Damper Control Servo Motor |
|
Data List Display |
|---|
|
Front Air Outlet Damper Control Servo Motor Actual Pulse |
OK:
The value of the Data List changes in accordance with the operation of the Active Test.
| OK |
|
|
|
9. |
CHECK BLOWER ASSEMBLY (DAMPER) |
(a) Remove the No. 1 blower damper servo sub-assembly.
Click here
(b) Operate the dampers by hand.
OK:
The dampers are easily operated by hand.
| OK |
|
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE BLOWER ASSEMBLY
|
|
|