RM36D0EC _58 Vehicle Interior _083104 HEATING / AIR CONDITIONING _0402828 AIR CONDITIONING SYSTEM(for Gasoline Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  B14B287  Lost Communication with Front Panel LIN Missing Message  


DESCRIPTION

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

If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will not operate, even if the air conditioning control assembly is operated.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14B287 Lost Communication with Front Panel LIN Missing Message
Diagnosis Condition:

Ignition switch ON


Malfunction Status:

Lost communication with air conditioning control assembly


Detection Time:

Continuously for 10 seconds or more


·

Air conditioning control assembly

·

Harness or connector

·

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 air conditioning control assembly ○ -
Lost communication with air conditioning control 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

E544607E01
5.896,0.885 6.354,1.083 0.458,0.198 10 false LIN1 5.385,2.917 5.844,3.115 0.458,0.198 10 false G46 5.563,3.094 7.156,3.573 1.594,0.479 10 false Air Conditioning Amplifier Assembly 4.271,2.521 4.729,2.719 0.458,0.198 10 false 8 5.615,0.76 6.073,0.958 0.458,0.198 10 false 7 3.135,0.438 3.594,0.635 0.458,0.198 10 false 9 4.26,0.74 4.719,0.938 0.458,0.198 10 false 7 3.083,1.031 3.542,1.229 0.458,0.198 10 false 13 3.344,0.552 3.802,0.75 0.458,0.198 10 false IG+ 3.875,0.896 4.333,1.094 0.458,0.198 10 false LIN1 3.323,1.146 3.781,1.344 0.458,0.198 10 false GND 2.802,1.615 3.26,1.813 0.458,0.198 10 false G24 2.792,1.781 5.313,2.385 2.521,0.604 10 false Air Conditioning Control Assembly 0.698,3.385 2.74,3.583 2.042,0.198 10 false : LIN Communication Line 0.448,0.49 1.813,0.854 1.365,0.365 10 false from Engine Stop and Start ECU 3.885,2.667 4.344,2.865 0.458,0.198 10 false SLIN 3.073,3.375 4.677,3.646 1.604,0.271 10 false Seat Heater Switch 3.063,3.208 3.521,3.406 0.458,0.198 10 false G31

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK DTC
a.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
B14B287 or B14B587 are not output A
B14B287 only is output B
B14B287 and B14B587 are not output C



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - POWER SOURCE AND BODY GROUND)

C

4.CHECK AIR CONDITIONING CONTROL ASSEMBLY
2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - POWER SOURCE AND BODY GROUND)

Pre-procedure1

a.

Disconnect the G24 air conditioning control assembly connector.


Procedure1

b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
G24-9 (IG+) - Body ground Ignition switch ON 10.5 to 16 V
G24-9 (IG+) - Body ground Ignition switch off Below 1 V



c.

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



Result:
Proceed to
OK
NG


Post-procedure1

d.

None



OK

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

NG

REPLACE HARNESS OR CONNECTOR

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

Pre-procedure1

a.

Disconnect the G24 air conditioning control assembly connector.


b.

Disconnect the G46 air conditioning amplifier assembly connector.


Procedure1

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



Result:
Proceed to
OK
NG


Post-procedure1

d.

None



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

GO TO STOP AND START SYSTEM

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING


4.CHECK AIR CONDITIONING CONTROL ASSEMBLY

Pre-procedure1

a.

Disconnect the G31 seat heater switch connector.


Procedure1

b.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
B14B287 and B14B587 are not output A
B14B587 only is output B


Post-procedure1

c.

None



A

5.CHECK AIR CONDITIONING CONTROL ASSEMBLY

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


5.CHECK AIR CONDITIONING CONTROL ASSEMBLY

Pre-procedure1

a.

Disconnect the G24 air conditioning control assembly connector.


Procedure1

b.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
B14B287 and B14B587 are not output A
B14B287 only is output B


Post-procedure1

c.

None



A

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

B

REPLACE SEAT HEATER SWITCH

Click hereVehicle Interior>SEAT>SEAT HEATER SWITCH (for Front Seat)>REMOVAL


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

Pre-procedure1

a.

Disconnect the G24 air conditioning control assembly connector.


b.

Disconnect the G46 air conditioning amplifier assembly connector.


c.

Disconnect the G31 seat heater switch connector.


Procedure1

d.

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



Result:
Proceed to
OK
NG


Post-procedure1

e.

None



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPLACE HARNESS OR CONNECTOR