Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026Z9K
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for TMC Made, and Gasoline Model, with Automatic Air Conditioning System): B144B87; Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

DTC

B144B87

Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly.

The No. 1 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

B144B87

Lost Communication with Front Left Air Mix Damper Control Servo Motor LIN Missing Message

Diagnosis Condition:

  • Ignition switch ON

Malfunction:

  • Error or open in communication line between air conditioning amplifier assembly and 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 in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly

○

-

Open in communication line between air conditioning amplifier assembly and 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

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

GO TO DTC B142A88

B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY