RM38T0EC _58 Vehicle Interior _104612 HEATING / AIR CONDITIONING _0601796 AIR CONDITIONING SYSTEM(for HEV Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HEV 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:

Error or 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

E496885E05
3.635,1.74 3.938,1.906 0.302,0.167 10 false IG+ 2.844,2.24 3.344,2.448 0.5,0.208 10 false GND 3.979,2.104 4.271,2.281 0.292,0.177 10 false 7 2.865,1.052 3.927,1.271 1.063,0.219 10 false ECU-IGP NO. 2 5.26,2.875 6.844,3.354 1.583,0.479 10 false Air Conditioning Amplifier Assembly 5.271,2.698 5.885,2.896 0.615,0.198 10 false I49 3.583,2.229 4.198,2.427 0.615,0.198 10 false LIN1 5.333,2.083 5.625,2.24 0.292,0.156 10 false 7 2.615,2.906 4.083,3.333 1.469,0.427 10 false Air Conditioning Control Assembly 2.625,2.719 3.24,2.917 0.615,0.198 10 false I37 0.646,3.375 2.698,3.667 2.052,0.292 10 false : LIN Communication Line 2.594,2.135 2.865,2.313 0.271,0.177 10 false 13 1.042,0.844 2.542,1.396 1.5,0.552 10 false from IGP-MAIN Relay 3.979,1.646 4.271,1.823 0.292,0.177 10 false 9 5.542,0.875 6.156,1.073 0.615,0.198 10 false IG+ 5.542,0.292 6.156,0.49 0.615,0.198 10 false B 5.531,1.521 6.146,1.719 0.615,0.198 10 false GND 5.26,1.417 5.552,1.573 0.292,0.156 10 false 17 5.323,0.781 5.615,0.938 0.292,0.156 10 false 6 5.313,0.198 5.604,0.354 0.292,0.156 10 false 5 1,0.271 3.083,0.646 2.083,0.375 10 false from Auxiliary Battery 5.531,2.24 5.865,2.458 0.333,0.219 10 false LIN1 2.927,0.479 3.854,0.656 0.927,0.177 10 false ECU-B NO. 2

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 - IG POWER SOURCE)
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 Switch Condition Specified Condition
I37-9 (IG+) - Body ground Ignition switch ON 11 to 14 V
I37-9 (IG+) - Body ground Ignition switch off Below 1 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.

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 CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the I49 air conditioning amplifier assembly connector.


b.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.

Using an oscilloscope, check the waveform.

E533886C07
2.229,0.333 2.656,0.604 0.427,0.271 2.833,1.333 3.094,2.25 true 2.365,0.385 2.823,0.583 0.458,0.198 10 false I49 0.125,0.146 0.583,0.344 0.458,0.198 10 false *a 4.615,1.802 5.073,2 0.458,0.198 10 false GND 2.979,2.281 3.438,2.479 0.458,0.198 10 false LIN1
*a Component with harness connected
(Air Conditioning Amplifier Assembly) 		- -


Tester Connection Tool Setting Switch Condition
I49-7 (LIN1) - Body ground 2 V/DIV., 20 ms./DIV. Ignition switch ON

OK:

Waveform is similar to that shown in the illustration.



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 (for Electrical Control Type)>REMOVAL