DTC U0028 [INSTRUMENT CLUSTER]

id0902e8496500

DTC U0028 | Invalid data received from climate control unit (ambient temperature signal)
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DETECTION CONDITION | Climate control unit malfunction or circuit malfunction
POSSIBLE CAUSE | • Open circuit in wiring harness between instrument cluster terminal 1I and climate control unit terminal J • Short to power supply in wiring harness between instrument cluster terminal 1I and climate control unit terminal J • Short to GND in wiring harness between instrument cluster terminal 1I and climate control unit terminal J • Climate control unit malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT CLIMATE CONTROL UNIT CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the climate control unit connector. • Inspect the climate control unit connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 6.
No | Go to the next step.
2 | INSPECT INSTRUMENT CLUSTER CONNECTOR • Disconnect the instrument cluster connector. • Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 6.
No | Go to the next step.
3 | INSPECT CLIMATE CONTROL UNIT SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between instrument cluster terminal 1I (wiring harness-side) and climate control unit terminal J (wiring harness-side) • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible open circuit, then go to Step 6.
4 | INSPECT CLIMATE CONTROL UNIT SIGNAL CIRCUIT FOR SHORT TO GND • Inspect for continuity between instrument cluster terminal 1I (wiring harness-side) and body GND. • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to GND, then go to Step 6.
No | Go to the next step.
5 | INSPECT CLIMATE CONTROL UNIT SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between instrument cluster terminal 1I (wiring harness-side) and body GND. • Is the voltage B+? | Yes | Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No | Replace the climate control unit, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
6 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the instrument cluster memory using the M-MDS. • Turn the ignition switch to the LOCK position then the ON position. • Is the same DTC present? | Yes | Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Troubleshooting completed.