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DTC U2300:54, U2300:55, U2300:56, U2300:64 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location

  • U2300:54: Configuration error (data not received)

  • U2300:55: Configuration error (not configured)

  • U2300:56: Configuration error (ineffective/non-interchangeable data read)

  • U2300:64: Configuration error (error value read)

Detection condition

  • Climate control unit detects configuration data not record or data error

Fail-safe function

  • Sets the configuration value to the fixed value

Possible cause

NOTE:

  • If power from the battery is interrupted, the climate control unit will go into a non-configured state because the memory for the configuration information is erased.

  • Normally, the configuration is re-performed within 6 s after the ignition is switched ON (engine off).

  • After performing the configuration, DTC U2300:55 will be cleared if the ignition is switched ON (engine off) after the ignition is switched off.

  • Module configuration procedure was not completed properly

  • Correct data cannot be received from instrument cluster

  • Climate control unit malfunction

System wiring diagram

Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

 RECORD CAR CONFIGURATION DATA

  • Switch the ignition ON (engine off) and wait for 6 s or more.

  • Switch the ignition off.

  • Switch the ignition ON (engine off).

Go to the next step.

2

 VERIFY THAT SAME DTC IS NOT PRESENT

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, go to the next step.

No

Go to Step 5.

3

 INSPECT FOR INSTRUMENT CLUSTER MALFUNCTION

Yes

Go to applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

After repairing the instrument cluster, perform the instrument cluster configuration.

(See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).)

Then go to the next step.

No

Go to the next step.

4

 VERIFY THAT SAME DTC IS NOT PRESENT

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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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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