RM38N0EC _58 Vehicle Interior _111841 HEATING / AIR CONDITIONING _0499788 AIR CONDITIONING SYSTEM(for Gasoline Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  B143A87  Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message  


DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly.

The No. 1 blower damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from Priority
B143A87 Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message Diagnosis Condition:

Ignition switch ON


Malfunction:

Error or open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly


Detection Time:

Continuously for 10 seconds or more


·

Air conditioning harness assembly

·

No. 1 blower damper servo sub-assembly


Memorized Air Conditioner B

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Ignition switch ON ○ ○
Malfunction Error in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly ○ -
Open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-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

E432281E05
0.375,4.563 1.698,4.979 1.323,0.417 10 false No. 1 Blower Damper Servo Sub-assembly 5.854,2.302 6.167,2.5 0.313,0.198 10 false IC 5.167,4.542 7.052,4.948 1.885,0.406 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 0.729,5.385 2.552,5.635 1.823,0.25 10 false : LIN Communication Line 2.563,4.594 4.083,5.021 1.521,0.427 10 false Air Conditioning Harness Assembly 0.906,1.615 2.448,1.99 1.542,0.375 10 false Air Conditioning Amplifier Assembly 1.75,0.51 2.208,0.708 0.458,0.198 10 false BUS 1.604,0.917 2.219,1.115 0.615,0.198 10 false B BUS 1.604,1.313 2.208,1.521 0.604,0.208 10 false BUS G 2.281,2.75 2.438,2.948 0.156,0.198 10 false 1 2.281,2.344 2.438,2.542 0.156,0.198 10 false 2 2.281,3.146 2.438,3.344 0.156,0.198 10 false 3 2.292,3.542 2.448,3.74 0.156,0.198 10 false 4 2.281,3.938 2.438,4.135 0.156,0.198 10 false 5 4.885,2.75 5.042,2.948 0.156,0.198 10 false 4 1.813,3.625 2.125,3.823 0.313,0.198 10 false M+ 1.813,4.021 2.125,4.219 0.313,0.198 10 false M- 1.719,2.823 2.135,3.021 0.417,0.198 10 false GND 2.271,2.542 2.427,2.74 0.156,0.198 10 false B 2.271,2.938 2.427,3.135 0.156,0.198 10 false B 2.271,3.333 2.427,3.531 0.156,0.198 10 false B 2.271,3.729 2.427,3.927 0.156,0.198 10 false B 2.271,4.125 2.427,4.323 0.156,0.198 10 false B 4.875,2.542 5.031,2.74 0.156,0.198 10 false A 4.875,2.938 5.031,3.135 0.156,0.198 10 false A 4.875,3.333 5.031,3.531 0.156,0.198 10 false A 4.875,3.729 5.031,3.927 0.156,0.198 10 false A 4.875,4.125 5.031,4.323 0.156,0.198 10 false A 5.198,3.615 5.51,3.813 0.313,0.198 10 false M+ 5.208,4 5.521,4.198 0.313,0.198 10 false M- 1.74,3.219 2.177,3.417 0.438,0.198 10 false sigB 5.198,2.438 5.635,2.635 0.438,0.198 10 false STE1 5.198,2.833 5.615,3.031 0.417,0.198 10 false GND 4.875,1.323 5.031,1.521 0.156,0.198 10 false A 4.875,0.927 5.031,1.125 0.156,0.198 10 false A 4.875,0.51 5.031,0.708 0.156,0.198 10 false A 4.896,2.344 5.052,2.542 0.156,0.198 10 false 5 4.885,3.146 5.042,3.344 0.156,0.198 10 false 6 4.885,3.531 5.042,3.729 0.156,0.198 10 false 7 4.885,3.927 5.042,4.125 0.156,0.198 10 false 8 2.229,0.51 2.563,0.75 0.333,0.24 10 false z1 2.24,0.927 2.573,1.167 0.333,0.24 10 false z1 2.229,1.313 2.563,1.552 0.333,0.24 10 false z1 2.271,0.313 2.427,0.51 0.156,0.198 10 false 3 2.281,0.74 2.438,0.938 0.156,0.198 10 false 4 2.271,1.135 2.427,1.333 0.156,0.198 10 false 2 4.885,0.323 5.042,0.521 0.156,0.198 10 false 2 4.875,0.729 5.031,0.927 0.156,0.198 10 false 1 4.885,1.125 5.042,1.323 0.156,0.198 10 false 3 5.219,0.354 5.677,0.552 0.458,0.198 10 false BUS 5.219,0.802 5.833,1 0.615,0.198 10 false B BUS 5.219,1.188 5.823,1.396 0.604,0.208 10 false BUS G 1.75,2.427 2.188,2.625 0.438,0.198 10 false sigA 5.198,3.219 5.635,3.417 0.438,0.198 10 false STE2

PROCEDURE

1.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
B142A88 is output A
B142A88 is not output B



A

GO TO DTC B142A88

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model)>B142A88


B

2.INSPECT AIR CONDITIONING HARNESS ASSEMBLY
2.INSPECT AIR CONDITIONING HARNESS ASSEMBLY

Pre-procedure1

a.

Disconnect the A No. 1 air conditioning radiator damper servo sub-assembly connector.


b.

Disconnect the B No. 1 blower damper servo sub-assembly connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A-6 (STE2) - B-3 (sigB) Always Below 1 Ω
A-5 (STE1) - B-2 (sigA) Always Below 1 Ω
A-8 (M-) - B-5 (M-) Always Below 1 Ω
A-7 (M+) - B-4 (M+) Always Below 1 Ω
A-4 (GND) - B-1 (GND) Always Below 1 Ω
A-6 (STE2) or B-3 (sigB) - Other terminals and body ground Always 10 kΩ or higher
A-5 (STE1) or B-2 (sigA) - Other terminals and body ground Always 10 kΩ or higher
A-8 (M-) or B-5 (M-) - Other terminals and body ground Always 10 kΩ or higher
A-7 (M+) or B-4 (M+) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

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


NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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