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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> On-Board Diagnostic - Manual A/C >> DTC U300E-13; Climate Control Unit Power Supply Circuit Open (IG2) >> Diagnostic procedure

Diagnostic procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

STEP INSPECTION ACTION
1 PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION Yes Go to the applicable DTC inspection.
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)] .)
No Go to the next step.
2 VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 7.
3 INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE (IG2)
  • Climate control unit connector is disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side):
    • Climate control unit terminal X
  • Is the voltage B+?
 Yes Go to Step 7.
No Go to the next step.
4 VERIFY FRONT BODY CONTROL MODULE(FBCM) CONNECTOR CONDITION Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 7.
5 INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR OPEN CIRCUIT
  • Climate control unit and front body control module (FBCM) connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal X- front body control module (FBCM) terminal 1C
  • 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 front body control module (FBCM) 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 7.
6 INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR SHORT TO GROUND
  • Climate control unit and front body control module (FBCM) connectors are disconnected.
  • Inspect for continuity between the following terminal (wiring harness-side) and body ground:
    • Climate control unit terminal X
  • 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 front body control module (FBCM) 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 Go to the next step.
7 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.
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.
(See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)] .)
No DTC troubleshooting completed.
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