Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPHG
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 02/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B14B2; Lost Communication with Front Panel LIN; 2019 MY RAV4 HV [11/2018 - 02/2019]

DTC

B14B2

Lost Communication with Front Panel LIN

DESCRIPTION

The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.

If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the air conditioning control assembly is operated.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14B2

Lost Communication with Front Panel LIN

Lost communication with air conditioning control assembly

  • Diagnosis condition: Power switch on (IG)
  • Malfunction status: Lost communication with air conditioning control assembly
  • Detection time: Continuously for 10 seconds or more
  • Harness or connector
  • Air conditioning control assembly
  • Air conditioning amplifier assembly

Memorized

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the air conditioning control assembly connector.

*a

Front view of wire harness connector

(to Air Conditioning Control Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G24-13 (GND) - Body ground

Always

Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

G24-9 (IG+) - Body ground

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)

(a) Disconnect the G24 air conditioning amplifier assembly connector.

(b) Disconnect the G46 air conditioning control assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G24-7 (LIN1) - G46-7 (LIN1)

Always

Below 1 Ω

G24-7 (LIN1) or G46-7 (LIN1) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)

(a) Using an oscilloscope, check the waveform.

Item

Content

Tester Connection

G46-7 (LIN1) - Body ground

Tool Setting

2 V/DIV., 20 μs/DIV.

Condition

Power switch on (IG)

OK:

The waveform displays properly.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY