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
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 |
![]() | GO TO DTC B142A88 |
|
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 |