RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591215 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)  B14B2  Lost Communication with Front Panel LIN  


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
B14B2 Lost Communication with Front Panel LIN Lost communication with air conditioning control assembly
·

Air conditioning control assembly

·

Harness or connector

·

Air conditioning amplifier assembly


Memorized
(10 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.


WIRING DIAGRAM

E416716E04
0.479,2.438 0.938,2.635 0.458,0.198 10 false I37 1.604,0.854 2.063,1.052 0.458,0.198 10 false LIN1 1.656,1.396 2.115,1.594 0.458,0.198 10 false IG+ 1.604,1.958 2.063,2.156 0.458,0.198 10 false GND 2.906,1.406 5.094,1.646 2.188,0.24 10 false from Engine Stop and Start ECU 5.271,0.896 5.729,1.094 0.458,0.198 10 false LIN1 4.813,2.469 5.271,2.667 0.458,0.198 10 false I49 0.479,2.604 2.594,2.875 2.115,0.271 10 false Air Conditioning Control Assembly 4.792,2.635 7.031,2.885 2.24,0.25 10 false Air Conditioning Amplifier Assembly 0.958,3.198 2.677,3.406 1.719,0.208 10 false : LIN Communication Line 2.01,0.719 2.469,0.917 0.458,0.198 10 false 7 2.01,1.292 2.469,1.49 0.458,0.198 10 false 9 2.01,1.823 2.469,2.021 0.458,0.198 10 false 13 5.052,0.719 5.51,0.917 0.458,0.198 10 false 7

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 Condition Specified Condition
I37-9 (IG+) - Body ground Ignition switch ON 10.5 to 16 V



Result:
Proceed to
OK
NG



OK

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

NG

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - ENGINE STOP AND START ECU)

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>Backup Boost Converter Circuit


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.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
E334619N03
0.302,1.563 0.76,1.76 0.458,0.198 10 false GND

a.

Connect the I49 air conditioning amplifier assembly connector.


b.

Turn the ignition switch to ON.


c.

Using an oscilloscope, check the waveform.

OK:

Waveform is similar to that shown in the illustration.


Item Content
Terminal No. I49-7 (LIN1) - Body ground
Tool Setting 2 V/DIV., 20 ms./DIV.
Condition Ignition switch ON


Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

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


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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