Toyota Yaris: Air Conditioning System / Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message (B144B87)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / 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:

  • Ignition switch ON

Malfunction Status:

  • Error or lost communication with No. 1 air conditioning radiator damper servo sub-assembly

Detection Time:

  • Continuously for 10 seconds or more

No. 1 air conditioning radiator damper servo sub-assembly

Memorized

DTC Detection Condition Combination Table
 

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

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