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)  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 DTC Output from Priority
B142A88 Servo Motor LIN Communication Bus off Diagnosis Condition:

Ignition switch ON


Malfunction:

Error or open in communication line between air conditioning amplifier assembly and 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 Air Conditioner A

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 each servo motor ○ -
Open in communication line between air conditioning amplifier assembly and 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

E445153E01
0.635,3.344 2.688,3.604 2.052,0.26 10 false : LIN Communication Line 1.302,1.313 1.615,1.51 0.313,0.198 10 false IC 5.208,2.25 6.76,2.656 1.552,0.406 10 false Air Conditioning Amplifier Assembly 0.448,2.292 2.354,2.708 1.906,0.417 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 2.729,2.125 4.229,2.573 1.5,0.448 10 false Air Conditioning Harness Assembly 4.771,0.802 5.083,1 0.313,0.198 10 false z1 2.448,0.792 2.604,0.99 0.156,0.198 10 false A 5.135,0.792 5.594,0.99 0.458,0.198 10 false BUS 5.135,1.313 5.646,1.49 0.51,0.177 10 false B BUS 5.135,1.823 5.646,2 0.51,0.177 10 false BUS G 4.813,0.604 4.969,0.802 0.156,0.198 10 false 3 4.813,1.615 4.969,1.813 0.156,0.198 10 false 2 4.813,1.104 4.969,1.302 0.156,0.198 10 false 4 2.458,1.115 2.615,1.313 0.156,0.198 10 false 1 2.469,0.604 2.625,0.802 0.156,0.198 10 false 2 2.458,1.625 2.615,1.823 0.156,0.198 10 false 3 4.76,1.313 5.073,1.51 0.313,0.198 10 false z1 4.76,1.823 5.073,2.021 0.313,0.198 10 false z1 2.448,1.313 2.604,1.51 0.156,0.198 10 false A 2.448,1.823 2.604,2.021 0.156,0.198 10 false A 1.906,0.625 2.365,0.823 0.458,0.198 10 false BUS 1.792,1.188 2.302,1.365 0.51,0.177 10 false B BUS 1.781,1.708 2.292,1.885 0.51,0.177 10 false BUS G

PROCEDURE

1.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 This test activates the front left air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (left side air mix)) 		128: Min
384: Max 		Operate with the ignition switch ON.
Front Right Air Mix Damper Control Servo Motor This test activates the front right air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (right side air mix)) 		128: Min
384: Max 		Operate with the ignition switch ON.
Air Inlet Damper Control Servo Motor This test activates the air inlet damper control servo motor.
(No. 1 blower damper servo sub-assembly) 		128: Min
384: Max 		Operate with the ignition switch ON.
Front Air Outlet Damper Control Servo Motor This test activates the front air outlet damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front mode)) 		128: Min
384: Max 		Operate with the ignition switch ON.
Fr Control Rear Air Outlet Damper Servo Motor This test activates the rear air outlet damper control servo motor.
(No. 2 air conditioning radiator damper servo sub-assembly (rear mode)) 		128: Min
384: Max 		Operate with the ignition switch ON.
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
Body Electrical > Air Conditioner > Active Test
Tester Display
Fr Control Rear Air Outlet Damper Servo Motor
50004 450 49

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

2.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

B

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


2.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
NOTICE:

When inspecting the air conditioning amplifier assembly, be careful not to cause a short.


Pre-procedure1

a.

Disconnect the z1 air conditioning amplifier assembly connector.


Procedure1

b.

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

w/o Seat Heater System:
E445154C01
4.906,0.156 5.292,0.396 0.385,0.24 5.156,0.938 5.646,2.031 5.646,2.031 5.927,2.031 true 5.031,0.948 5.531,2.333 5.531,2.333 5.927,2.333 true 4.896,0.948 5.344,2.625 5.344,2.625 5.927,2.625 true 5.042,0.208 5.354,0.406 0.313,0.198 10 false z1 4.604,0.094 4.917,0.292 0.313,0.198 10 false *a 2.25,3.156 2.708,3.354 0.458,0.198 10 false GND 5.99,1.969 6.76,2.167 0.771,0.198 10 false BUS G 5.99,2.271 6.76,2.469 0.771,0.198 10 false BUS 5.99,2.563 6.76,2.76 0.771,0.198 10 false B BUS
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


w/ Seat Heater System:
E432287C05
6.302,0.083 6.688,0.333 0.385,0.25 5.646,2.302 6.01,2.302 6.01,2.302 6.427,0.938 true 5.635,2.021 5.885,2.021 5.885,2.021 6.292,0.938 true 5.656,2.573 6.146,2.573 6.146,2.573 6.552,0.958 true 2.219,3.146 2.677,3.344 0.458,0.198 10 false GND 6.438,0.135 6.896,0.333 0.458,0.198 10 false z1 6,0.125 6.313,0.323 0.313,0.198 10 false *a 5.146,2.49 5.688,2.698 0.542,0.208 10 false BUS G 5.292,2.229 6.063,2.427 0.771,0.198 10 false BUS 5.146,1.958 5.917,2.156 0.771,0.198 10 false B BUS
*a Component without harness connected
(Air Conditioning Amplifier Assembly) 		- -


Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(z1)Location & Routing

Click Connector(z1)Instrument Panel>Other>Air Conditioning Harness Assembly, Air Conditioning Amplifier Assembly

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

Click Location & Routing(z1)Location & Routing

Click Connector(z1)Instrument Panel>Other>Air Conditioning Harness Assembly, Air Conditioning Amplifier Assembly

z1-4 (B BUS) - z1-2 (BUS G) Ignition switch off 11 to 14 V



d.

Using an oscilloscope, check the waveform.

Item Content
Tester Connection z1-3 (BUS) - z1-2 (BUS G)
Tool Setting 2 V/DIV., 20 μs/DIV.
Condition Ignition switch ON

OK:

The waveform displays properly.


Result:
Proceed to
OK
NG



Post-procedure1

e.

None



OK

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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