RM38N0EC _58 Vehicle Interior _111841 HEATING / AIR CONDITIONING _0499788 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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14B287	Lost Communication with Front Panel LIN Missing Message	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and air conditioning control assembly Detection Time: Continuously for 10 seconds or more	· Harness or connector · Air conditioning control assembly · Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Error in communication line between air conditioning amplifier assembly and air conditioning control assembly	○	-
Malfunction	Open in communication line between air conditioning amplifier assembly and 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

1.625,2.229 2,2.417 0.375,0.188 10 false LIN1 1.688,1.167 1.99,1.333 0.302,0.167 10 false IG+ 1.625,1.688 2.125,1.896 0.5,0.208 10 false GND 2.021,1.563 2.313,1.74 0.292,0.177 10 false 13 4.646,2.698 7.031,2.99 2.385,0.292 10 false Air Conditioning Amplifier Assembly 4.646,2.552 5.26,2.75 0.615,0.198 10 false E44 5.26,2.24 5.875,2.438 0.615,0.198 10 false LIN1 5.042,2.073 5.333,2.229 0.292,0.156 10 false 7 0.396,2.719 2.74,3.083 2.344,0.365 10 false Air Conditioning Control Assembly 0.396,2.542 1.01,2.74 0.615,0.198 10 false E22 0.635,3.427 2.708,3.688 2.073,0.26 10 false : LIN Communication Line 2.031,2.042 2.302,2.219 0.271,0.177 10 false 7 3.51,1.156 5.698,1.406 2.188,0.25 10 false from Engine Stop and Start ECU 2.031,1.063 2.323,1.24 0.292,0.177 10 false 9

PROCEDURE

1.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AUXILIARY BATTERY)

Pre-procedure1

Disconnect the E22 air conditioning control assembly connector.

Procedure1

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E22)Location & Routingewd_type=routing;type=c;code=E22 Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=9
E22-9 (IG+) - Body ground	Ignition switch ON	10.5 to 16 V

Tester Connection

Condition

Specified Condition

Click Location & Routing(E22)Location & Routingewd_type=routing;type=c;code=E22

Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=9

E22-9 (IG+) - Body ground

Ignition switch ON

10.5 to 16 V

Result:

Proceed to
OK
NG

Post-procedure1

None

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

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

Pre-procedure1

Disconnect the E22 air conditioning control assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E22)Location & Routingewd_type=routing;type=c;code=E22 Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=13
E22-13 (GND) - Body ground	Always	Below 1 Ω

Tester Connection

Condition

Specified Condition

Click Location & Routing(E22)Location & Routingewd_type=routing;type=c;code=E22

Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=13

E22-13 (GND) - Body ground

Always

Below 1 Ω

Result:

Proceed to
OK
NG

Post-procedure1

None

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Pre-procedure1

Disconnect the E22 air conditioning control assembly connector.

Disconnect the E44 air conditioning amplifier assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E22,E44)Location & Routingewd_type=routing;type=c,c;code=E22,E44 Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=7 Click Connector(E44)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Amplifier Assemblyewd_type=component;type=c;code=E44;pinno=7
E22-7 (LIN1) - E44-7 (LIN1)	Always	Below 1 Ω
E22-7 (LIN1) or E44-7 (LIN1) - Other terminals and body ground	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

Click Location & Routing(E22,E44)Location & Routingewd_type=routing;type=c,c;code=E22,E44

Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assemblyewd_type=component;type=c;code=E22;pinno=7

Click Connector(E44)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Amplifier Assemblyewd_type=component;type=c;code=E44;pinno=7

E22-7 (LIN1) - E44-7 (LIN1)

Always

Below 1 Ω

E22-7 (LIN1) or E44-7 (LIN1) - Other terminals and body ground

Always

10 kΩ or higher

Result:

Proceed to
OK
NG

Post-procedure1

None

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT)

Pre-procedure1

Disconnect the E22 air conditioning control assembly connector.

Connect the E44 air conditioning amplifier assembly connector.

Procedure1

0.365,1.563 0.823,1.76 0.458,0.198 10 false GND

Using an oscilloscope, check the waveform.

Item	Content
Tester Connection	E44-7 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 μs/DIV.
Condition	Ignition switch ON

OK:: The waveform displays properly.

Result:

Proceed to
OK
NG

Post-procedure1

None

5.CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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5.CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)

Pre-procedure1

Connect the E22 air conditioning control assembly connector.

Procedure1

0.365,1.563 0.823,1.76 0.458,0.198 10 false GND

Using an oscilloscope, check the waveform.

Item	Content
Tester Connection	E22-7 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 μs/DIV.
Condition	Ignition switch ON

OK:: The waveform displays properly.

Result:

Proceed to
OK
NG

Post-procedure1

None

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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REPLACE AIR CONDITIONING CONTROL ASSEMBLY

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