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Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1A61:11, B1A61:13 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DIAGNOSTIC PROCEDURE - WITH DUAL TYPE CLIMATE CONTROL UNIT

STEP INSPECTION ACTION
1 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CONNECTOR Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 6.
2 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR Yes Go to the next step.
No Replace the passenger compartment temperature sensor.
(See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
Go to Step 6.
3 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal 1H- passenger compartment temperature sensor terminal A
      • Climate control unit terminal 1J- passenger compartment 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 passenger compartment 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 Step 6.
4 INSPECT PASSENGER COMPARTMENT 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 passenger compartment 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 Step 6.
No 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 connector or terminal.
After repair procedure, go to the next step.
6 VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 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.
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .)
No DTC troubleshooting completed.


DTC B1A61:11, B1A61:13 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DIAGNOSTIC PROCEDURE - WITH SINGLE TYPE CLIMATE CONTROL UNIT

STEP INSPECTION ACTION
1 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CONNECTOR Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 6.
2 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR Yes Go to the next step.
No Replace the passenger compartment temperature sensor.
(See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
Go to Step 6.
3 INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal F-passenger compartment temperature sensor terminal A
      • Climate control unit terminal E- passenger compartment 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 passenger compartment 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 Step 6.
4 INSPECT PASSENGER COMPARTMENT 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 passenger compartment 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 Step 6.
No 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 connector or terminal.
After repair procedure, go to the next step.
6 VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 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.
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .)
No DTC troubleshooting completed.
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