Toyota Yaris: Air Conditioning System / Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message (B144B87)
DESCRIPTION
The air conditioning harness assembly connects the air conditioning amplifier assembly and the No. 1 air conditioning radiator damper servo sub-assembly. The air conditioning amplifier assembly supplies power and sends operation instructions to No. 1 air conditioning radiator damper servo sub-assembly through the air conditioning harness assembly. The No. 1 air conditioning radiator 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 |
|---|---|---|---|---|
| B144B87 | Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message | Diagnosis Condition:
Malfunction Status:
Detection Time:
| No. 1 air conditioning radiator damper servo sub-assembly | Memorized |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | Ignition switch ON | ○ | ○ |
| Malfunction | Error communication with No. 1 air conditioning radiator damper servo sub-assembly | ○ | - |
| Lost communication with No. 1 air conditioning radiator 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 |
| B |
 | REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
Air Inlet Damper Control Servo Motor Actuator Stuck Off (B143B7F)
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 air inlet damper to the appropriate position, which controls the air inlet switching...
Front Left Air Mix Damper Control Servo Motor Actuator Stuck Off (B144C7F)
DESCRIPTION The No. 1 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position...
Other information:
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Front Seat Belt Pretensioners
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.
