RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  B14B2  Lost Communication with Front Panel LIN  


DESCRIPTION

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

If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the air conditioning control assembly is operated.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14B2 Lost Communication with Front Panel LIN Lost communication with air conditioning control assembly
·

Diagnosis condition: Ignition switch ON

·

Malfunction status: Lost communication with air conditioning control assembly

·

Detection time: Continuously for 10 seconds or more


·

Harness or connector

·

Air conditioning control assembly

·

Air conditioning amplifier assembly


Memorized

WIRING DIAGRAM

E416665E01
5.615,0.479 6.073,0.677 0.458,0.198 10 false B 5.625,1.542 6.083,1.74 0.458,0.198 10 false LIN1 5.625,2.042 6.083,2.24 0.458,0.198 10 false GND 5.365,2.427 5.823,2.625 0.458,0.198 10 false N42 6.479,1.646 6.771,1.844 0.292,0.198 10 false IC 5.375,2.604 6.948,3.115 1.573,0.51 10 false Air Conditioning Amplifier Assembly 5.385,0.375 5.844,0.573 0.458,0.198 10 false 5 5.385,1.531 5.844,1.729 0.458,0.198 10 false 7 5.302,1.927 5.76,2.125 0.458,0.198 10 false 17 1.76,1.146 2.219,1.344 0.458,0.198 10 false 9 1.76,1.531 2.219,1.729 0.458,0.198 10 false 7 1.76,1.927 2.219,2.125 0.458,0.198 10 false 13 1.385,1.146 1.844,1.344 0.458,0.198 10 false IG+ 1.344,1.531 1.802,1.729 0.458,0.198 10 false LIN1 1.333,1.927 1.792,2.125 0.458,0.198 10 false GND 0.458,1.677 0.917,1.875 0.458,0.198 10 false CPU 0.313,2.448 0.771,2.646 0.458,0.198 10 false N55 0.313,2.594 1.802,2.979 1.49,0.385 10 false Air Conditioning Control Assembly 0.781,3.479 2.823,3.677 2.042,0.198 10 false : LIN Communication Line 2.406,0.844 3.969,1.063 1.563,0.219 10 false from IG1 NO.3 Relay 4.063,0.646 5.073,0.854 1.01,0.208 10 false ECU-ALT NO.1 2.938,0.458 3.813,0.667 0.875,0.208 10 false from Battery 5.635,0.875 6.094,1.073 0.458,0.198 10 false IG+ 5.385,0.76 5.844,0.958 0.458,0.198 10 false 6

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)
a.
E403239C02
1.448,0.354 1.948,0.604 0.5,0.25 0.906,2.021 1.156,2.021 1.156,2.021 1.333,1.635 true 2.521,2.021 2.271,2.021 2.271,2.021 2.094,1.656 true 1.573,0.396 2,0.604 0.427,0.208 10 false N55 2.583,1.906 3.01,2.115 0.427,0.208 10 false GND 0.625,1.938 1.052,2.146 0.427,0.208 10 false IG+ 0.063,0.052 0.49,0.26 0.427,0.208 10 false *a
*a Front view of wire harness connector
(to Air Conditioning Control Assembly)


Disconnect the 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
N55-13 (GND) - Body ground Always Below 1 Ω



c.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
N55-9 (IG+) - Body ground Ignition switch ON 11 to 14 V
Ignition switch off Below 1 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the N55 air conditioning amplifier assembly connector.


b.

Disconnect the N42 air conditioning control assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N55-7 (LIN1) - N42-7 (LIN1) Always Below 1 Ω
N55-7 (LIN1) or N42-7 (LIN1) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

3.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.

Disconnect the N55 air conditioning control assembly connector.


b.
E407118C04
0.417,0.5 0.917,0.75 0.5,0.25 2.5,0.99 2.25,0.99 2.25,0.99 1.99,0.719 true 0.063,0.063 0.375,0.26 0.313,0.198 10 false *a 0.177,2.948 0.563,3.146 0.385,0.198 10 false GND 2.563,0.906 2.917,1.104 0.354,0.198 10 false LIN1 0.542,0.542 0.854,0.74 0.313,0.198 10 false N42
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


Using an oscilloscope, check the waveform.

Item Content
Tester Connection N42-7 (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

4.CHECK AIR CONDITIONING CONTROL ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


4.CHECK AIR CONDITIONING CONTROL ASSEMBLY
a.
E407118C04
0.417,0.5 0.917,0.75 0.5,0.25 2.5,0.99 2.25,0.99 2.25,0.99 1.99,0.719 true 0.063,0.063 0.375,0.26 0.313,0.198 10 false *a 0.177,2.948 0.563,3.146 0.385,0.198 10 false GND 2.563,0.906 2.917,1.104 0.354,0.198 10 false LIN1 0.542,0.542 0.854,0.74 0.313,0.198 10 false N42
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


Using an oscilloscope, check the waveform.

Item Content
Tester Connection N42-7 (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 (for Front)>REMOVAL