LIN COMMUNICATION SYSTEM, Diagnostic DTC:B14B2
| DTC Code | DTC Name |
|---|---|
| B14B2 | Lost Communication with Front Panel LIN |
DESCRIPTION
This circuit consists of the air conditioning control assembly and the air conditioning amplifier assembly. When the air conditioning control assembly is operated, signals are transmitted to the air conditioning amplifier assembly through the LIN communication system.
If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate when the air conditioning control assembly is operated.
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
B14B2 |
Lost communication with the air conditioning control assembly. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - AIR CONDITIONING AMPLIFIER)
-
Disconnect the H46 amplifier connector.
Disconnect the H21 air conditioning control connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
H21-10 (LIN1) - H46-37 (LIN1)
Always
Below 1 Ω
H21-10 (LIN1) - Body ground
Always
10 kΩ or higher
Table 1. Text in Illustration *1
Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)
*2
Front view of wire harness connector
(to Air Conditioning Control Assembly)
REPAIR OR REPLACE HARNESS OR CONNECTOR
-
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - BATTERY AND BODY GROUND)
-
Disconnect the H21 air conditioning control connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Switch Condition
Specified Condition
H21-2 (IG+) - H21-5 (GND)
Ignition switch off
Below 1 V
H21-2 (IG+) - H21-5 (GND)
Ignition switch ON
11 to 14 V
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
H21-5 (GND) - Body ground
Always
Below 1 Ω
Table 2. Text in Illustration *1
Front view of wire harness connector
(to Air Conditioning Control Assembly)
REPAIR OR REPLACE HARNESS OR CONNECTOR
-
REPLACE AIR CONDITIONING CONTROL ASSEMBLY
Replace the air conditioning control assembly with a new or normally functioning one (Click here).
CHECK AIR CONDITIONING CONTROL ASSEMBLY
Operate the air conditioning control to check that it functions properly.
OK
Air conditioning control assembly operates normally.
END (AIR CONDITIONING CONTROL ASSEMBLY IS FAULTY)