Toyota Corolla Cross: Lost Communication with Front Air Mix Damper Control Servo Motor LIN Missing Message (B140587)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Gasoline Model With Automatic Air Conditioning System) / Lost Communication with Front Air Mix Damper Control Servo Motor LIN Missing Message (B140587)

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
B140587	Lost Communication with Front 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 No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B140587

Lost Communication with Front 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	○	-
Malfunction	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

GO TO DTC B142A88

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

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Toyota Corolla Cross: Lost Communication with Front Air Mix Damper Control Servo Motor LIN Missing Message (B140587)

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