- Error in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly*1
- Error in communication line between air conditioning amplifier assembly and No. 5 air conditioning radiator damper servo sub-assembly*2
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000028C3Q |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): B143A87; Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] | ||
|
DTC |
B143A87 |
Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message |
DESCRIPTION
for M20A-FKS:
-
The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly.
The No. 1 blower damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.
for G16E-GTS:
-
The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 5 air conditioning radiator damper servo sub-assembly.
The No. 5 air conditioning radiator damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B143A87 |
Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message |
Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Memorized |
DTC Detection Condition Combination Table
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
|
Malfunction |
|
○ |
- |
|
- |
○ |
|
|
Detection Time |
Continuously for 10 seconds or more |
Continuously for 10 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.
- *1: for M20A-FKS
- *2: for G16E-GTS
WIRING DIAGRAM
for M20A-FKS:
for G16E-GTS:
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC B142A88 is output |
A |
|
DTC B142A88 is not output |
B |
| A |
|
|
|
2. |
CONFIRM MODEL |
|
Result |
Proceed to |
|---|---|
|
for M20A-FKS |
A |
|
for G16E-GTS |
B |
| B |
|
|
|
3. |
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 |
| OK |
|
| NG |
|
|
4. |
INSPECT AIR CONDITIONING HARNESS ASSEMBLY |
(a) Disconnect the m4 No. 1 air conditioning radiator damper servo sub-assembly connector.
(b) Disconnect the m1 No. 5 air conditioning radiator 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 |
| OK |
|
REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
| NG |
|
|
|