DTC B1A61:11, B1A61:13 [FULL-AUTO AIR CONDITIONER]
id0702c1816800
With Dual Type Climate Control Unit
System malfunction location |
• B1A61:11: Cabin temperature sensor circuit short to ground
• B1A61:13: Cabin temperature sensor circuit open
|
---|---|
Detection condition
|
• Malfunction in wiring harness between cabin temperature sensor and climate control unit
|
Fail-safe function
|
Malfunction determined when ignition switched ON
• Cabin temperature sensor input value is fixed at the value right before the malfunction.
Malfunction already exists when ignition switched ON
• Cabin temperature sensor input value is fixed at 25 °C {77 °F}.
|
Possible cause
|
• Connector or terminal malfunction
• Cabin temperature sensor malfunction
• Open circuit in wiring harness between climate control unit and cabin temperature sensor
• Short to ground in wiring harness between climate control unit and cabin temperature sensor
• Climate control unit malfunction
|
Diagnostic Procedure
Step |
Inspection |
Action |
|
---|---|---|---|
1
|
INSPECT CABIN TEMPERATURE SENSOR CONNECTOR
• Switch the ignition off.
• Disconnect the negative battery cable.
• Disconnect the cabin temperature sensor 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 to the next step.
|
||
2
|
INSPECT CABIN TEMPERATURE SENSOR
• Inspect the cabin temperature sensor.
• Is it normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the cabin temperature sensor.
Go to the next step.
|
||
3
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the climate control unit connector.
• Disconnect the cabin temperature sensor connector.
• 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 whether or not there is a common connector between climate control unit terminal and cabin temperature sensor 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 part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to the next step.
|
||
4
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminal (wiring harness-side) and body ground:
• Is there continuity?
|
Yes
|
Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and cabin temperature sensor 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 part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to the next step.
|
No
|
Connect the climate control unit connector, then go to the next step.
|
||
5
|
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
• 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 malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
|
||
6
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT
• Connect the climate control unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Inspect the voltage at the following climate control unit terminal (wiring harness-side).
• Is the voltage normal? (Approx. 5 V)
|
Yes
|
The system is normal at present.
Go to the next step.
|
No
|
Go to the next step.
|
||
7
|
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
• Switch the ignition off.
• Disconnect the negative battery cable.
• Reconnect the disconnected connectors.
• Connect the negative battery cable.
• Clear the past malfunction from memory.
• Verify DTCs.
• Is DTC B1A61:11 or B1A61:13 output?
|
Yes
|
Repeat the inspection from Step 1.
• If the malfunction does not recur, go to the next step.
• If the malfunction recurs, replace the 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 output?
|
Yes
|
Perform the corresponding DTC inspection.
|
No
|
DTC troubleshooting completed.
|
With Single Type Climate Control Unit
System malfunction location |
• B1A61:11: Cabin temperature sensor circuit short to ground
• B1A61:13: Cabin temperature sensor circuit open
|
---|---|
Detection condition
|
• Malfunction in wiring harness between cabin temperature sensor and climate control unit
|
Fail-safe function
|
Malfunction determined when ignition switched ON
• Cabin temperature sensor input value is fixed at 25 °C {77 °F}.
Malfunction already exists when ignition switched ON
• Cabin temperature sensor input value is fixed at the value right before the malfunction.
|
Possible cause
|
• Connector or terminal malfunction
• Cabin temperature sensor malfunction
• Open circuit in wiring harness between climate control unit and cabin temperature sensor
• Short to ground in wiring harness between climate control unit and cabin temperature sensor
• Climate control unit malfunction
|
Diagnostic procedure
STEP |
INSPECTION |
ACTION |
|
---|---|---|---|
1
|
INSPECT CABIN TEMPERATURE SENSOR CONNECTOR
• Switch the ignition off.
• Disconnect the negative battery cable.
• Disconnect the cabin temperature sensor 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 to the next step.
|
||
2
|
INSPECT CABIN TEMPERATURE SENSOR
• Inspect the cabin temperature sensor.
• Is it normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the cabin temperature sensor.
Go to the next step.
|
||
3
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the climate control unit connector.
• Disconnect the cabin temperature sensor connector.
• 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 whether or not there is a common connector between climate control unit terminal and cabin temperature sensor 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 part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to the next step.
|
||
4
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminal (wiring harness-side) and body ground:
• Is there continuity?
|
Yes
|
Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and cabin temperature sensor 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 part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to the next step.
|
No
|
Connect the climate control unit connector, then go to the next step.
|
||
5
|
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
• 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 malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
|
||
6
|
INSPECT CABIN TEMPERATURE SENSOR CIRCUIT
• Connect the climate control unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Inspect the voltage at the following climate control unit terminal (wiring harness-side).
• Is the voltage normal? (Approx. 5 V)
|
Yes
|
The system is normal at present.
Go to the next step.
|
No
|
Go to the next step.
|
||
7
|
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
• Switch the ignition off.
• Disconnect the negative battery cable.
• Reconnect the disconnected connectors.
• Connect the negative battery cable.
• Clear the past malfunction from memory.
• Verify DTCs.
• Is DTC B1A61:11 or B1A61:13 output?
|
Yes
|
Repeat the inspection from Step 1.
• If the malfunction does not recur, go to the next step.
• If the malfunction recurs, replace the 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 output?
|
Yes
|
Perform the corresponding DTC inspection.
|
No
|
DTC troubleshooting completed.
|