Note
• There are two types of front climate control unit, type A and type B.
ac9wzw00005466
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DTC U0466:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]
id0702k2901700
ac9wzw00005466
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Front Climate Control Unit Type A
|
System malfunction location |
Invalid data received from rear climate control unit |
|---|---|
|
Detection condition
|
• Front climate control unit received error signals from the rear climate control unit
|
|
Fail-safe function
|
• The value of the error signal is fixed at the specified value.
|
|
Possible cause
|
• Front climate control unit connector or terminal malfunction
• Rear climate control unit connector or terminal malfunction
• Open circuit in wiring harness between front climate control unit and rear climate control unit
• Short to ground in wiring harness between front climate control unit and rear climate control unit
• Short to power supply in wiring harness between front climate control unit and rear climate control unit
• Front climate control unit malfunction
• Rear climate control unit malfunction
|
 |
|
Diagnostic procedure
|
Step |
Inspection |
Action |
|
|---|---|---|---|
|
1
|
INSPECT REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the rear climate control unit connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go Step 7.
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||
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2
|
INSPECT FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Disconnect the front climate control unit connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go Step 7.
|
||
|
3
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
• Is there continuity?
|
Yes
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 7.
|
|
No
|
Go to the next step.
|
||
|
4
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO POWER SUPPLY
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminal (wiring harness-side):
• Is the voltage 0 V?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 7.
|
||
|
5
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Inspect for continuity between the following terminals (wiring harness-side):
• Is there continuity?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 7.
|
||
|
6
|
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the climate control unit DTC inspection using the M-MDS.
• Is the same DTC displayed?
|
Yes
|
Replace the rear climate control unit, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
7
|
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the climate control unit DTC inspection using the M-MDS.
• Is the same DTC displayed?
|
Yes
|
Repeat the inspection from Step 1.
• If the malfunction recurs, replace the front climate control unit.
Go to the next step.
|
|
No
|
Go to the next step.
|
||
|
8
|
VERIFY THAT NO OTHER DTCs ARE PRESENT
• Verify other DTCs displayed.
• Are any other DTCs displayed?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
|
|
No
|
DTC troubleshooting completed.
|
||
Front Climate Control Unit Type B
|
System malfunction location |
Invalid data received from rear climate control unit |
|---|---|
|
Detection condition
|
• Front climate control unit received error signals from the rear climate control unit
|
|
Fail-safe function
|
• The value of the error signal is fixed at the specified value.
|
|
Possible cause
|
• Front climate control unit connector or terminal malfunction
• Rear climate control unit connector or terminal malfunction
• Open circuit in wiring harness between front climate control unit and rear climate control unit
• Short to ground in wiring harness between front climate control unit and rear climate control unit
• Short to power supply in wiring harness between front climate control unit and rear climate control unit
• Front climate control unit malfunction
• Rear climate control unit malfunction
|
 |
|
Diagnostic procedure
|
Step |
Inspection |
Action |
|
|---|---|---|---|
|
1
|
INSPECT REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the rear climate control unit connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go Step 7.
|
||
|
2
|
INSPECT FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Disconnect the front climate control unit connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go Step 7.
|
||
|
3
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
• Is there continuity?
|
Yes
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 7.
|
|
No
|
Go to the next step.
|
||
|
4
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO POWER SUPPLY
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminal (wiring harness-side):
• Is the voltage 0 V?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 7.
|
||
|
5
|
INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Inspect for continuity between the following terminals (wiring harness-side):
• Is there continuity?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify if there is a common connector between front climate control unit terminal and rear climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning location.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 7.
|
||
|
6
|
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the climate control unit DTC inspection using the M-MDS.
• Is the same DTC displayed?
|
Yes
|
Replace the rear climate control unit, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
7
|
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the climate control unit DTC inspection using the M-MDS.
• Is the same DTC displayed?
|
Yes
|
Repeat the inspection from Step 1.
• If the malfunction recurs, replace the front climate control unit.
Go to the next step.
|
|
No
|
Go to the next step.
|
||
|
8
|
VERIFY THAT NO OTHER DTCs ARE PRESENT
• Verify other DTCs displayed.
• Are any other DTCs displayed?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
|
|
No
|
DTC troubleshooting completed.
|
||
