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)  B142A88  Servo Motor LIN Communication Bus off  


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
B142A88 Servo Motor LIN Communication Bus off Diagnosis Condition:

Ignition switch ON


Malfunction Status:

Error or lost communication with each servo motor


Detection Time:

Continuously for 10 seconds or more


·

Air conditioning harness assembly

·

No. 1 air conditioning radiator damper servo sub-assembly

·

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 each servo motor ○ -
Lost communication with each servo motor - ○
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

w/ Rear Air Duct
E510643E02
0.333,1.958 1.594,2.396 1.26,0.438 10 false Front Air Mix LH*1 4.719,2.292 4.948,2.49 0.229,0.198 10 false 4 4.719,1.708 4.948,1.906 0.229,0.198 10 false 3 5.104,0.615 5.396,0.844 0.292,0.229 10 false B 5.104,2.417 5.667,2.646 0.563,0.229 10 false B BUS 5.104,1.813 5.479,2.042 0.375,0.229 10 false BUS 5.104,3 5.667,3.229 0.563,0.229 10 false BUS G 0.188,6.938 2.635,7.448 2.448,0.51 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 5.104,6.875 6.833,7.417 1.729,0.542 10 false No. 1 Blower Damper Servo Sub-assembly 0.646,8.323 2.344,8.594 1.698,0.271 10 false : LIN Communication Line 2.948,7.073 4.5,7.604 1.552,0.531 10 false Air Conditioning Harness Assembly 5.073,3.802 6.656,4.333 1.583,0.531 10 false Air Conditioning Amplifier Assembly 2.625,8.313 4.656,8.583 2.031,0.271 10 false *1: for Dual Type 4.719,2.885 4.948,3.083 0.229,0.198 10 false 2 0.542,2.354 1.802,2.792 1.26,0.438 10 false Front Air Mix*2 0.375,6.052 1.635,6.49 1.26,0.438 10 false Front Air Mix RH*1 0.813,4.146 2.073,4.583 1.26,0.438 10 false Front Mode 5.083,1.313 5.646,1.542 0.563,0.229 10 false GND 4.698,3.104 5.26,3.333 0.563,0.229 10 false z1 3.979,8.313 6.01,8.583 2.031,0.271 10 false *2: for Single Type 4.677,1.031 5.24,1.26 0.563,0.229 10 false 17 4.698,0.396 4.927,0.594 0.229,0.198 10 false 5 4.667,0.646 5.229,0.875 0.563,0.229 10 false I49 4.667,1.292 5.229,1.521 0.563,0.229 10 false I49 4.688,2.51 5.25,2.74 0.563,0.229 10 false z1 4.698,1.938 5.26,2.167 0.563,0.229 10 false z1 3.042,0.865 4.125,1.156 1.083,0.292 10 false ECU-B NO. 2 1.146,0.594 2.708,1.021 1.563,0.427 10 false from Auxiliary Battery 5.813,5.854 6.74,6.635 0.927,0.781 10 false Recirculation / Fresh

w/o Rear Air Duct
E510643E03
0.333,1.958 1.594,2.396 1.26,0.438 10 false Front Air Mix LH*1 4.719,2.292 4.948,2.49 0.229,0.198 10 false 4 4.719,1.708 4.948,1.906 0.229,0.198 10 false 3 5.104,0.615 5.396,0.844 0.292,0.229 10 false B 5.104,2.417 5.594,2.646 0.49,0.229 10 false BUSB 5.104,1.813 5.479,2.042 0.375,0.229 10 false BUS 5.104,3 5.667,3.229 0.563,0.229 10 false BUSG 0.188,6.938 2.635,7.448 2.448,0.51 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 5.104,6.875 6.833,7.417 1.729,0.542 10 false No. 1 Blower Damper Servo Sub-assembly 0.646,8.323 2.344,8.594 1.698,0.271 10 false : LIN Communication Line 2.948,7.073 4.5,7.604 1.552,0.531 10 false Air Conditioning Harness Assembly 5.073,3.802 6.656,4.333 1.583,0.531 10 false Air Conditioning Amplifier Assembly 2.625,8.313 4.656,8.583 2.031,0.271 10 false *1: for Dual Type 4.719,2.885 4.948,3.083 0.229,0.198 10 false 2 0.542,2.354 1.802,2.792 1.26,0.438 10 false Front Air Mix*2 0.375,6.052 1.635,6.49 1.26,0.438 10 false Front Air Mix RH*1 0.813,4.146 2.073,4.583 1.26,0.438 10 false Front Mode 5.083,1.313 5.646,1.542 0.563,0.229 10 false GND 3.979,8.313 6.01,8.583 2.031,0.271 10 false *2: for Single Type 4.677,1.031 5.24,1.26 0.563,0.229 10 false 17 4.698,0.396 4.927,0.594 0.229,0.198 10 false 5 4.667,0.646 5.229,0.875 0.563,0.229 10 false I49 4.667,1.292 5.229,1.521 0.563,0.229 10 false I49 4.656,2.521 5.219,2.75 0.563,0.229 10 false m6 4.656,1.938 5.219,2.167 0.563,0.229 10 false m6 3.042,0.865 4.125,1.156 1.083,0.292 10 false ECU-B NO. 2 1.146,0.594 2.708,1.021 1.563,0.427 10 false from Auxiliary Battery 5.813,5.854 6.74,6.635 0.927,0.781 10 false Recirculation / Fresh 4.667,3.115 5.229,3.344 0.563,0.229 10 false m6

CAUTION / NOTICE / HINT

NOTICE:

This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HEV Model)>INITIALIZATION


PROCEDURE

1.CHECK VEHICLE TYPE
a.

Check vehicle specifications.


Result:
Result Proceed to
for Dual Type A
for Single Type B



A

2.PERFORM ACTIVE TEST USING GTS

B

3.PERFORM ACTIVE TEST USING GTS
2.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Left Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 165 to 257
Front Right Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 255 to 347
Air Inlet Damper Control Servo Motor No. 1 blower damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 220 to 256 pulses
Front Air Outlet Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 234 to 348
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Left Air Mix Damper Control Servo Motor
50004 450 26
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Right Air Mix Damper Control Servo Motor
50004 450 28
Body Electrical > Air Conditioner > Active Test
Tester Display
Air Inlet Damper Control Servo Motor
50004 450 32
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Air Outlet Damper Control Servo Motor
50004 450 47

Result:
Result Proceed to
All of the damper servo motors do not operate A
Any of the damper servo motors does not operate B
All of the damper servo motors operate C



A

5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

B

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


3.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Air Inlet Damper Control Servo Motor No. 1 blower damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 220 to 256 pulses
Front Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 165 to 257
Front Air Outlet Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 234 to 348
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Right Air Mix Damper Control Servo Motor
50004 450 28
Body Electrical > Air Conditioner > Active Test
Tester Display
Air Inlet Damper Control Servo Motor
50004 450 32
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Air Outlet Damper Control Servo Motor
50004 450 47

Result:
Result Proceed to
All of the damper servo motors do not operate A
Any of the damper servo motors does not operate B
All of the damper servo motors operate C



A

4.CHECK VEHICLE TYPE

B

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


4.CHECK VEHICLE TYPE
a.

Check vehicle specifications.


Result:
Result Proceed to
w/ Rear Air Duct A
w/o Rear Air Duct B



A

5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

B

7.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.


a.

Disconnect the z1 air conditioning amplifier assembly connector.


b.

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

E547455C02
4.76,0.365 5.188,0.594 0.427,0.229 4.448,2.177 4.792,1.188 true 5.479,2.188 5.083,1.188 true 4.917,0.406 5.375,0.604 0.458,0.198 10 false z1 4.229,2.229 4.771,2.448 0.542,0.219 10 false B BUS 5.333,2.219 5.792,2.417 0.458,0.198 10 false BUS G 0.104,0.083 0.563,0.281 0.458,0.198 10 false *a
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


Standard Resistance:
Tester Connection Condition Specified Condition
z1-2 (BUS G) - 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
z1-4 (B BUS) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.


a.

Using an oscilloscope, check the waveform.

E535580C10
3.375,0.313 3.802,0.542 0.427,0.229 3.26,2.198 3.51,1.198 true 4.052,2.198 3.656,1.198 true 4.531,1.75 4.99,1.948 0.458,0.198 10 false GND 3.5,0.344 3.958,0.542 0.458,0.198 10 false z1 3.083,2.25 3.542,2.448 0.458,0.198 10 false BUS 3.896,2.229 4.354,2.427 0.458,0.198 10 false BUS G 0.104,0.083 0.563,0.281 0.458,0.198 10 false *a
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


Tester Connection Tool Setting Switch Condition
z1-3 (BUS) - z1-2 (BUS G) 2 V/DIV., 2 ms./DIV. Ignition switch ON

OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


7.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.


a.

Disconnect the m6 air conditioning amplifier assembly connector.


b.

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

E547455C04
4.76,0.365 5.188,0.594 0.427,0.229 4.448,2.177 4.792,1.188 true 5.479,2.188 5.083,1.188 true 4.896,0.406 5.354,0.604 0.458,0.198 10 false m6 4.229,2.229 4.771,2.448 0.542,0.219 10 false BUSB 5.333,2.219 5.792,2.417 0.458,0.198 10 false BUSG 0.104,0.083 0.563,0.281 0.458,0.198 10 false *a
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


Standard Resistance:
Tester Connection Condition Specified Condition
m6-2 (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
m6-4 (BUSB) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.


a.

Using an oscilloscope, check the waveform.

E535580C12
3.375,0.313 3.802,0.542 0.427,0.229 3.26,2.198 3.51,1.198 true 4.052,2.198 3.656,1.198 true 4.531,1.75 4.99,1.948 0.458,0.198 10 false GND 3.5,0.344 3.958,0.542 0.458,0.198 10 false m6 3.083,2.229 3.542,2.427 0.458,0.198 10 false BUS 3.896,2.229 4.354,2.427 0.458,0.198 10 false BUSG 0.104,0.083 0.563,0.281 0.458,0.198 10 false *a
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


Tester Connection Tool Setting Switch Condition
m6-3 (BUS) - m6-2 (BUSG) 2 V/DIV., 2 ms./DIV. Ignition switch ON

OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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