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DTC U300E:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

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2016 – MX-5 – HVAC

DTC U300E:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location

  • Climate control unit power supply circuit open (IG1)

Detection condition

  • Malfunction in wiring harness between climate control unit and IG1 relay

Fail-safe function

Not applicable

Possible cause

  • IG1 relay malfunction

  • Climate control unit connector malfunction

  • Open circuit in wiring harness between battery positive terminal and climate control unit terminal

  • Climate control unit malfunction

Step

Inspection

Action

1

INSPECT IG1 RELAY FOR MALFUNCTION

Yes

Go to the next step.

No

Replace the IG1 relay, then go to Step 5.

(See RELAY LOCATION.)

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 the next step.

3

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

  • Inspect for continuity between climate control unit terminal N and IG1 relay.

  • 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 IG1 relay.

    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 CLIMATE CONTROL UNIT

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

5

VERIFY THAT NO OTHER DTCs ARE PRESENT

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.

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