Toyota Yaris: Air Conditioning System / Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)

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:

  • Ignition switch ON

Malfunction Status:

  • Error or lost communication with No. 1 blower damper servo sub-assembly

Detection Time:

  • Continuously for 10 seconds or more
  • No. 1 blower damper servo sub-assembly
  • Air conditioning harness assembly

Memorized

DTC Detection Condition Combination Table
 

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

B

2.

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

(a) Disconnect the h7 No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Disconnect the h4 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

h7-1 (M-) - h4-5 (M-)

Always

Below 1 Ω

h7-2 (M+) - h4-4 (M+)

Always

Below 1 Ω

h7-3 (STE2) - h4-3 (sigB)

Always

Below 1 Ω

h7-4 (STE1) - h4-2 (sigA)

Always

Below 1 Ω

h7-5 (GND) - h4-1 (GND)

Always

Below 1 Ω

h7-1 (M-) or h4-5 (M-) - Other terminals and body ground

Always

10 kΩ or higher

h7-2 (M+) or h4-4 (M+) - Other terminals and body ground

Always

10 kΩ or higher

h7-3 (STE2) or h4-3 (sigB) - Other terminals and body ground

Always

10 kΩ or higher

h7-4 (STE1) or h4-2 (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

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