RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0598792 AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE)) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE))  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
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

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 ○ -
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

E472001E17
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 2.125,1.323 3.229,1.552 1.104,0.229 10 false ECU-IGP NO. 3 4.646,2.698 7.031,2.99 2.385,0.292 10 false Air Conditioning Amplifier Assembly 4.885,2.219 5.5,2.417 0.615,0.198 10 false I49 5.26,2.24 5.875,2.438 0.615,0.198 10 false LIN1 4.938,2.021 5.229,2.177 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 I37 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 3.802,1.156 5.417,1.385 1.615,0.229 10 false from IGP-MAIN Relay 2.031,1.063 2.323,1.24 0.292,0.177 10 false 9

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 - AUXILIARY BATTERY)
a.

Disconnect the I37 air conditioning control assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I37-9 (IG+) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the I37 air conditioning control assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I37-13 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the I37 air conditioning control assembly connector.


b.

Disconnect the I49 air conditioning amplifier assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I37-7 (LIN1) - I49-7 (LIN1) Always Below 1 Ω
I37-7 (LIN1) or I49-7 (LIN1) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT)
a.

Disconnect the I37 air conditioning control assembly connector.


b.

Connect the I49 air conditioning amplifier assembly connector.


c.
E334619N01
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 I49-7 (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



OK

5.CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


5.CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)
a.

Connect the I37 air conditioning control assembly connector.


b.
E334619N01
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 I37-7 (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



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

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