LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (On-Board Diagnostic - Auto A/C) >> DTC B1C1A-11; B1C1A-13; B1C1B-11; B1C1B-13: [Climate Control Unit (Full-Auto Air Conditioner)] >> Diagnostic Procedure

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 B1C1A:11, B1C1A:13, B1C1B:11, B1C1B:13 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT AIR MIX ACTUATOR CONNECTOR Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 6.
2 INSPECT AIR MIX ACTUATOR Yes Go to the next step.
No Replace the air mix actuator.
(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
Go to Step 6.
3 INSPECT AIR MIX ACTUATOR (POTENTIOMETER) 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): Driver-side
    • Climate control unit terminal 1N-Air mix actuator terminal G
    • Climate control unit terminal 2G-Air mix actuator terminal F
      • Climate control unit terminal 1J-Air mix actuator terminal E

    Passenger-side

    • Climate control unit terminal 1N-Air mix actuator terminal E
    • Climate control unit terminal 2E-Air mix actuator terminal F
      • Climate control unit terminal 1J-Air mix actuator terminal G
  • 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 air mix actuator 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 AIR MIX ACTUATOR (POTENTIOMETER) SHORT TO GROUND
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground: Driver-side
    • Climate control unit terminal 1N
      • Climate control unit terminal 2G

    Passenger-side

    • Climate control unit terminal 1N
      • Climate control unit terminal 2E
  • 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 air mix actuator 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.
scientia non olet · About LEMON Manuals