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)  B1497  Communication Malfunction (Bus Ic)  


DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1497 Communication Malfunction (Bus Ic)
·

Diagnosis condition: None

·

Malfunction status: Error or open in communication line between air conditioning amplifier assembly and servo motor


for Front:
·

Air conditioning harness assembly

·

No. 1 air conditioning radiator damper servo sub-assembly

·

No. 1 blower damper servo sub-assembly

·

Air conditioning amplifier assembly


for Rear (w/ Integration Control Panel (for Rear Automatic Air Conditioning))
·

No. 2 air conditioning harness assembly

·

No. 1 rear cooling unit damper servo sub-assembly

·

No. 2 rear cooling unit damper servo sub-assembly

·

Air conditioning amplifier assembly


Memorized

WIRING DIAGRAM

for Front:
E414332E01
5.042,0.708 5.813,0.906 0.771,0.198 10 false BUS 5.042,1.094 5.813,1.292 0.771,0.198 10 false BUSB 5.052,1.49 5.823,1.688 0.771,0.198 10 false BUSG 4.76,0.677 5.01,0.875 0.25,0.198 10 false 3 4.76,1.104 5.01,1.302 0.25,0.198 10 false 4 4.771,1.479 5.021,1.677 0.25,0.198 10 false 2 1.385,3.677 1.823,3.865 0.438,0.188 10 false Mode 0.771,4.896 2.688,5.563 1.917,0.667 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 0.875,7.5 2.573,8 1.698,0.5 10 false No. 1 Blower Damper Servo Sub-assembly 3.156,7.438 4.698,7.875 1.542,0.438 10 false Air Conditioning Harness Assembly 4.729,8.083 5.5,8.281 0.771,0.198 10 false t2 4.719,8.25 6.99,8.5 2.271,0.25 10 false Air Conditioning Amplifier Assembly 0.885,8.563 3.26,8.823 2.375,0.26 10 false : LIN Communication Line 6.021,0.823 6.792,1.021 0.771,0.198 10 false IC 6.333,0.938 7.104,1.135 0.771,0.198 10 false +B 1.26,1.438 1.771,1.646 0.51,0.208 10 false Air Mix

for Rear (w/ Integration Control Panel (for Rear Automatic Air Conditioning)):
E421584E01
5.042,0.646 5.656,0.844 0.615,0.198 10 false RBUS 5.042,1.104 5.656,1.302 0.615,0.198 10 false RBBU 5.052,1.469 5.667,1.667 0.615,0.198 10 false RBUG 5.083,2.656 5.698,2.854 0.615,0.198 10 false N44 5.073,2.844 6.667,3.208 1.594,0.365 10 false Air Conditioning Amplifier Assembly 4.781,0.635 5.396,0.833 0.615,0.198 10 false 7 4.792,1.094 5.406,1.292 0.615,0.198 10 false 2 4.781,1.479 5.396,1.677 0.615,0.198 10 false 3 0.698,2.323 2.698,2.719 2,0.396 10 false No. 1 Rear Cooling Unit Damper Servo Sub-assembly 0.719,4.823 2.76,5.208 2.042,0.385 10 false No. 2 Rear Cooling Unit Damper Servo Sub-assembly 3.26,4.719 4.635,5.115 1.375,0.396 10 false No. 2 Air Conditioning Harness Assembly 0.958,1.26 1.833,1.458 0.875,0.198 10 false Rear Air Mix 1.073,3.813 1.802,4.042 0.729,0.229 10 false Rear Mode

PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (SERVO PULSE)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Air Conditioner / Active Test.


e.

Check the operation by referring to the table below.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse Min.: 128
Max.: 383 		Operates between 165 to 257 pulses
Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse Min.: 128
Max.: 383 		Operates between 256 to 348 pulses
Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
Max.: 383
for 1 Layer Type:

Operates between 235 to 258 pulses


for 2 Layer Type:

Operates between 220 to 256 pulses


Rear Air Mix Servo Targ Pulse No. 1 rear cooling unit damper servo motor sub-assembly (rear air mix) target pulse Min.: 128
Max.: 383 		Operates between 254 and 299 pulses
(w/ Integration Control and Panel (for Rear Automatic Conditioning))
A/O Servo Pulse(Rr D) No. 2 rear cooling unit damper servo motor sub-assembly (rear mode) target pulse Min.: 128
Max.: 383 		Operates between 200 and 276 pulses
(w/ Integration Control and Panel (for Rear Automatic Air Conditioning))
Body Electrical > Air Conditioner > Active Test
Tester Display
Air Mix Servo Targ Pulse(D)
50004 121 24
Body Electrical > Air Conditioner > Active Test
Tester Display
Air Outlet Servo Pulse (D)
50004 121 26
Body Electrical > Air Conditioner > Active Test
Tester Display
Air Inlet Damper Targ Pulse
50004 121 27
Body Electrical > Air Conditioner > Active Test
Tester Display
Rear Air Mix Servo Targ Pulse
50004 121 36
Body Electrical > Air Conditioner > Active Test
Tester Display
A/O Servo Pulse(Rr D)
50004 121 56
OK:

Damper servo motor is operated.



f.

Check the operation by referring to the table below.


Result:
Result Proceed to
All damper servo motors are not operated (for Front) A
All damper servo motors are not operated (for Rear) (w/ Integration Control and Panel (for Rear Automatic Air Conditioning)) B
Any damper servo motor is not operated (for Front) C
Any damper servo motor is not operated (for Rear) (w/ Integration Control and Panel (for Rear Automatic Air Conditioning)) D
All damper servo motors are operated E



A

2.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT)

B

3.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT)

C

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

for LHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for LHD)>DISASSEMBLY

for RHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for RHD)>DISASSEMBLY



D

REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REAR AIR CONDITIONING UNIT>DISASSEMBLY


E

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


2.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT)
a.
E407116C03
2.344,1.792 2.844,2.042 0.5,0.25 1.865,0.698 1.969,0.104 1.969,0.104 2.219,0.104 true 1.99,0.708 2.375,0.292 2.375,0.292 2.625,0.292 true 1.729,0.688 1.479,0.271 1.479,0.271 1.198,0.271 true 0.094,0.052 0.406,0.25 0.313,0.198 10 false *a 2.51,1.833 2.823,2.031 0.313,0.198 10 false t2 2.292,0.021 2.604,0.219 0.313,0.198 10 false BUS 2.677,0.208 3.208,0.417 0.531,0.208 10 false BUSG 0.396,3.938 0.927,4.146 0.531,0.208 10 false GND 0.75,0.188 1.281,0.396 0.531,0.208 10 false BUSB
*a Component without harness connected
(Air Conditioning Amplifier Assembly)


Disconnect the 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
2 (BUSG) - Body ground Always Below 1 Ω



c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
2 (BUSG) - 4 (BUSB) Always 11 to 14 V



d.

Using an oscilloscope, check the waveform.

Item Content
Tester Connection 2 (BUSG) - 3 (BUS)
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 HARNESS ASSEMBLY

for LHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for LHD)>DISASSEMBLY

for RHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for RHD)>DISASSEMBLY



3.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT)
a.
E421585C01
0.5,1.75 1,2 0.5,0.25 0.896,0.323 1.146,0.323 1.146,0.323 1.365,0.677 true 2.417,0.115 2.125,0.115 2.125,0.115 2.042,0.781 true 2.594,0.344 2.302,0.344 2.302,0.344 2.125,0.698 true 0.073,0.125 0.385,0.323 0.313,0.198 10 false *a 0.625,1.781 0.938,1.979 0.313,0.198 10 false N44 0.458,0.26 0.969,0.469 0.51,0.208 10 false RBUG 2.469,0.021 2.979,0.229 0.51,0.208 10 false RBUS 2.635,0.26 3.146,0.469 0.51,0.208 10 false RBBU 0.417,3.938 0.927,4.146 0.51,0.208 10 false GND
*a Component without harness connected
(Air Conditioning Amplifier Assembly)


Disconnect the 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
3 (RBUG) - Body ground Always Below 1 Ω



c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
2 (RBBU) - 3 (RBUG) Always 11 to 14 V



d.

Using an oscilloscope, check the waveform.

Item Content
Tester Connection 3 (RBUG) - 7 (RBUS)
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 NO. 2 AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REAR AIR CONDITIONING UNIT>DISASSEMBLY