Last Modified: 05-13-2024 |
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:
-
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
|
-
No. 1 blower damper servo sub-assembly
-
No. 1 air conditioning radiator damper servo sub-assembly
-
Air conditioning harness assembly
-
Blower assembly
|
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
-
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
(a) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
Result
|
Proceed to
|
DTC B14037F, B14067F and B143B7F are output
|
A
|
DTC B143B7F is output
|
B
|
B
|
|
|
2.
|
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 ignition switch ON.
|
Body Electrical > Air Conditioner > Active Test
Tester Display
|
Air Inlet Damper Control Servo Motor
|
OK:
No. 1 blower damper servo sub-assembly is operated.
OK
|
|
|
3.
|
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.
OK
|
|
|
4.
|
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
|
OK
|
|
|
5.
|
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
|
|
|
6.
|
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
|
|