NETWORKING  CAN COMMUNICATION SYSTEM  Air Conditioning Amplifier Communication Stop Mode  


DESCRIPTION

Detection Item Symptom Trouble Area
Air Conditioning Amplifier Communication Stop Mode Either condition is met:
·

"Air Conditioning Amplifier" is not displayed on the CAN Bus Check screen of the GTS

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·

Communication system DTCs (DTCs that start with U) that correspond to "Air Conditioning Amplifier Communication Stop Mode" in "DTC Combination Table" are output

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·

Air conditioning amplifier assembly branch line or connector

·

Power source circuit of air conditioning amplifier assembly

·

Air conditioning amplifier assembly ground circuit

·

Air conditioning amplifier assembly



WIRING DIAGRAM

C290616E11
2.302,1.156 2.125,0.677 2.125,0.677 2.021,0.677 false 4.865,1.156 5.073,0.771 5.073,0.771 5.167,0.771 false 0.052,0.031 7.156,0.271 7.104,0.24 12 false V Bus (for Automatic Air Conditioning System): 4.396,0.406 5.01,0.604 0.615,0.198 10 false DLC3 0.073,0.573 4.354,0.771 4.281,0.198 10 false No. 1 CAN Junction Connector 5.24,0.667 7.156,0.948 1.917,0.281 10 false No. 2 CAN Junction Connector 0.688,2.083 1.458,2.281 0.771,0.198 10 false 120 Ω 6.135,2.063 6.906,2.26 0.771,0.198 10 false 120 Ω 0.667,2.708 1.125,2.906 0.458,0.198 10 false ECM 5.792,2.677 6.99,3.5 1.198,0.823 10 false Combination Meter Assembly 3.344,3.135 3.958,3.333 0.615,0.198 10 false CANH 3.833,3.135 4.448,3.333 0.615,0.198 10 false CANL 4.125,3.417 4.583,3.615 0.458,0.198 10 false GND 3.042,3.198 3.5,3.396 0.458,0.198 10 false IG+ 3.063,3.646 3.219,3.844 0.156,0.198 10 false B 2.906,3.104 3.063,3.302 0.156,0.198 10 false 1 2.844,3.563 3.156,3.76 0.313,0.198 10 false 21 3.344,2.938 3.656,3.135 0.313,0.198 10 false 11 3.958,2.938 4.271,3.135 0.313,0.198 10 false 12 4.479,3.302 4.792,3.5 0.313,0.198 10 false 14 1.927,3.333 3,3.531 1.073,0.198 10 false HTR-IG 1.917,3.771 2.969,3.958 1.052,0.188 10 false ECU-B NO. 2 2.885,3.938 6.865,4.417 3.979,0.479 10 false Air Conditioning Amplifier Assembly 2.51,3.938 2.969,4.135 0.458,0.198 10 false E102 3.104,4.469 4.938,4.667 1.833,0.198 10 false Trouble Area 1.427,4.99 5.406,5.188 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.427,5.396 5.406,5.594 3.979,0.198 10 false : CAN Main Bus Line (CANL) 4.396,4.99 6.167,5.229 1.771,0.24 10 false : CAN Branch Line (CANH) 4.396,5.396 6.167,5.656 1.771,0.26 10 false : CAN Branch Line (CANL)

C289281E08
2.729,1.156 2.583,0.677 2.583,0.677 2.438,0.677 false 4.906,1.156 5.052,0.781 5.052,0.781 5.135,0.781 false 0.063,0.063 4.146,0.448 4.083,0.385 12 false V Bus (for Manual Air Conditioning System): 4.396,0.417 5.01,0.615 0.615,0.198 10 false DLC3 0.479,0.563 2.396,0.792 1.917,0.229 10 false No. 1 CAN Junction Connector 5.208,0.688 7.156,0.917 1.948,0.229 10 false No. 2 CAN Junction Connector 0.719,2.083 1.49,2.281 0.771,0.198 10 false 120 Ω 6.167,2.063 6.938,2.26 0.771,0.198 10 false 120 Ω 5.781,2.677 6.979,3.24 1.198,0.563 10 false Combination Meter Assembly 0.698,2.708 1.156,2.906 0.458,0.198 10 false ECM 2.01,3.563 3.083,3.76 1.073,0.198 10 false HTR-IG 2.99,3.292 3.146,3.49 0.156,0.198 10 false 1 3.51,2.958 3.667,3.156 0.156,0.198 10 false 8 4.094,2.958 4.25,3.156 0.156,0.198 10 false 9 4.573,3.302 4.885,3.5 0.313,0.198 10 false 23 4.208,3.406 4.667,3.604 0.458,0.198 10 false GND 3.167,3.396 3.625,3.594 0.458,0.198 10 false IG+ 3.406,3.146 4.021,3.344 0.615,0.198 10 false CANH 3.906,3.146 4.521,3.344 0.615,0.198 10 false CANL 2.594,3.927 3.052,4.125 0.458,0.198 10 false E7 2.875,3.927 6.854,4.125 3.979,0.198 10 false Air Conditioning Amplifier Assembly 3.26,4.448 5.094,4.646 1.833,0.198 10 false Trouble Area 1.427,4.99 5.406,5.188 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.427,5.396 5.406,5.594 3.979,0.198 10 false : CAN Main Bus Line (CANL) 4.396,4.99 6.25,5.24 1.854,0.25 10 false : CAN Branch Line (CANH) 4.406,5.396 6.26,5.646 1.854,0.25 10 false : CAN Branch Line (CANL)

CAUTION / NOTICE / HINT

NOTICE:
·

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

·

DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds.

·

After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM

·

Inspect the fuses for circuits related to this system before performing the following procedure.



HINT:
·

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

·

Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.



PROCEDURE

1.CHECK VEHICLE TYPE
a.

Check vehicle type.

Result:
Result Proceed to
for Automatic Air Conditioning System A
for Manual Air Conditioning System B




A

2.CHECK FOR OPEN IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH LINE)

B

4.CHECK FOR OPEN IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH LINE)
2.CHECK FOR OPEN IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH LINE)
a.

Disconnect the cable from the negative (-) battery terminal.


b.

Disconnect the E102 air conditioning amplifier assembly connector.


c.
C289268C10
1.542,0.458 2.052,0.729 0.51,0.271 1.906,2.385 2.156,1.344 2.156,1.344 2.292,1.344 true 1.771,2.385 1.292,1.365 1.292,1.365 1.156,1.365 true 0.083,0.083 0.396,0.281 0.313,0.198 10 false *a 1.635,0.51 2.094,0.708 0.458,0.198 10 false E102 0.74,1.271 1.354,1.469 0.615,0.198 10 false CANH 2.375,1.25 2.99,1.448 0.615,0.198 10 false CANL
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
E102-11 (CANH) - E102-12 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Result
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY)

3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C289268C11
1.531,0.438 2.042,0.719 0.51,0.281 2.125,2.385 2.375,1.344 2.375,1.344 2.51,1.344 true 0.083,0.083 0.396,0.281 0.313,0.198 10 false *a 1.635,0.51 2.094,0.708 0.458,0.198 10 false E102 2.573,1.25 3.188,1.448 0.615,0.198 10 false GND
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
E102-14 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



b.

Reconnect the cable to the negative (-) battery terminal.


c.
C289268C12
1.531,0.438 2.073,0.74 0.542,0.302 1,3.01 0.854,3.01 0.854,3.01 0.635,2.604 true 0.625,2.396 0.813,1.24 0.813,1.24 0.938,1.24 true 0.083,0.083 0.396,0.281 0.313,0.198 10 false *a 1.646,0.51 2.104,0.708 0.458,0.198 10 false E102 0.99,1.146 1.604,1.344 0.615,0.198 10 false IG+ 1.073,2.917 1.688,3.115 0.615,0.198 10 false B
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Voltage:
Tester Connection Condition Specified Condition
E102-21 (B) - Body ground Always 11 to 14 V
E102-1 (IG+) - Body ground Ignition switch ON 11 to 14 V



Result:
Result
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

4.CHECK FOR OPEN IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH LINE)
a.

Disconnect the cable from the negative (-) battery terminal.


b.

Disconnect the E7 air conditioning amplifier assembly connector.


c.
C289263C07
1.49,0.104 1.927,0.417 0.438,0.313 2.021,1.771 2.208,1.771 2.208,1.771 2.563,1 true 2.698,0.948 2.781,0.385 2.781,0.385 2.885,0.385 true 0.083,0.063 0.396,0.26 0.313,0.198 10 false *a 1.615,0.177 2.073,0.375 0.458,0.198 10 false E7 1.594,1.667 2.208,1.865 0.615,0.198 10 false CANH 2.948,0.292 3.427,0.51 0.479,0.219 10 false CANL
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
E7-8 (CANH) - E7-9 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Result
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY)

5.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C289263C08
1.458,0.146 1.938,0.448 0.479,0.302 2.219,1.771 2.344,1.771 2.344,1.771 2.688,1.208 true 0.063,0.052 0.375,0.25 0.313,0.198 10 false *a 1.604,0.208 2.063,0.406 0.458,0.198 10 false E7 1.865,1.667 2.323,1.865 0.458,0.198 10 false GND
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
E7-23 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



b.

Reconnect the cable to the negative (-) battery terminal.


c.
C289263C09
1.458,0.146 1.938,0.448 0.479,0.302 0.625,0.948 0.781,0.396 0.781,0.396 0.938,0.396 true 0.063,0.052 0.375,0.25 0.313,0.198 10 false *a 1.604,0.208 2.063,0.406 0.458,0.198 10 false E7 1,0.313 1.458,0.51 0.458,0.198 10 false IG+
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


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

Standard Voltage:
Tester Connection Condition Specified Condition
E7-1 (IG+) - Body ground Ignition switch ON 11 to 14 V



Result:
Result
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)