Toyota Corolla Cross: Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)
DESCRIPTION
The air conditioning harness assembly and No. 1 air conditioning radiator damper servo sub-assembly connect the air conditioning amplifier assembly and the No. 1 blower damper servo sub-assembly. The air conditioning amplifier assembly supplies power and sends operation instructions to No. 1 blower damper servo sub-assembly through the air conditioning harness assembly and No. 1 air conditioning radiator damper servo sub-assembly. The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position.
|
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 Status:
Detection Time:
|
| Memorized |
|
Vehicle Condition | |||
|---|---|---|---|
|
Pattern 1 | Pattern 2 | ||
|
Diagnosis Condition | Ignition switch ON |
○ | ○ |
|
Malfunction | Error communication with No. 1 blower damper servo sub-assembly |
○ | - |
|
Lost communication with No. 1 blower damper servo sub-assembly |
- | ○ | |
|
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.
WIRING DIAGRAM
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PROCEDURE
| 1. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes|
Result | Proceed to |
|---|---|
|
B142A88 is output | A |
|
B142A88 is not output |
B |
| A |
.gif) | GO TO DTC B142A88 |
|
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| 2. |
INSPECT AIR CONDITIONING HARNESS ASSEMBLY |
(a) Disconnect the A No. 1 air conditioning radiator damper servo sub-assembly connector.
(b) Disconnect the B 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 |
|---|---|---|
|
A-1 (M-) - B-5 (M-) | Always |
Below 1 Ω |
|
A-2 (M+) - B-4 (M+) | Always |
Below 1 Ω |
|
A-3 (STE2) - B-3 (sigB) |
Always | Below 1 Ω |
|
A-4 (STE1) - B-2 (sigA) |
Always | Below 1 Ω |
|
A-5 (GND) - B-1 (GND) |
Always | Below 1 Ω |
|
A-1 (M-) or B-5 (M-) - Other terminals and body ground |
Always | 10 kΩ or higher |
|
A-2 (M+) or B-4 (M+) - Other terminals and body ground |
Always | 10 kΩ or higher |
|
A-3 (STE2) or B-3 (sigB) - Other terminals and body ground |
Always | 10 kΩ or higher |
|
A-4 (STE1) or B-2 (sigA) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY |
| NG | | REPLACE AIR CONDITIONING HARNESS ASSEMBLY |
