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 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):
―  Climate control unit terminal 1H—cabin temperature sensor terminal A
―  Climate control unit terminal 1J—cabin temperature sensor terminal B
•  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:
―  Climate control unit terminal 1H
•  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.
•  Switch the ignition ON (engine off or on).
•  Inspect the voltage at the following climate control unit terminal (wiring harness-side).
―  Terminal 1H (cabin temperature sensor input signal)
•  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.
•  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 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):
―  Climate control unit terminal F—cabin temperature sensor terminal A
―  Climate control unit terminal E—cabin temperature sensor terminal B
•  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:
―  Climate control unit terminal F
•  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.
•  Switch the ignition ON (engine off or on).
•  Inspect the voltage at the following climate control unit terminal (wiring harness-side).
―  Terminal F (cabin temperature sensor input signal)
•  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.
•  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.