Toyota Yaris: Air Conditioning System / Servo Motor LIN Communication Bus off (B142A88)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / Servo Motor LIN Communication Bus off (B142A88)

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B142A88

Servo Motor LIN Communication Bus off

Diagnosis Condition:

  • Ignition switch ON

Malfunction Status:

  • Error or lost communication with each servo motor

Detection Time:

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

Memorized

DTC Detection Condition Combination Table
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

Ignition switch ON

Malfunction

Error communication with each servo motor

-

Lost communication with each servo motor

-

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

CAUTION / NOTICE / HINT

NOTICE:

This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.

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PROCEDURE

1.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.

(a) Disconnect the air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

h6-4 (BUSB) - Body ground

Always

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

h6-2 (BUSG) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

2.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(a) Using an oscilloscope, check the waveform.

Item

Content

Terminal No.

h6-3 (BUS) ←→ h6-2 (BUSG)

Tool Setting

2 V/DIV., 2 ms./DIV.

Condition

Ignition switch ON

OK:

Waveform is similar to that shown in the illustration.

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

3.

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

h6-2 (BUSG) - h7-6 (GND)

Always

Below 1 Ω

h6-3 (BUS) - h7-7 (LIN)

Always

Below 1 Ω

h6-4 (BUSB) - h7-8 (+B)

Always

Below 1 Ω

OK

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

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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