DTC U0423:00, U0424:00 [WATER HEATER SYSTEM]SM2445581
DTC U0423:00, U0424:00 [WATER HEATER SYSTEM]

id070228733700

DTC

U0423:00

Invalid data received from instrument cluster

U0424:00

Invalid data received from climate control unit
POSSIBLE CAUSE
• Instrument cluster malfunction
• Climate control unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
PERFORM INSTRUMENT CLUSTER DTC INSPECTION
• Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
2
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
• Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [WATER HEATER SYSTEM].) (See CLEARING DTC [FULL-AUTO AIR CONDITIONER].)
• Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [WATER HEATER SYSTEM].) (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].)
• Is the same DTC present?
Yes
Replace the instrument cluster, then go to the next step.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Go to the next step.
3
VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [WATER HEATER SYSTEM].) (See CLEARING DTC [FULL-AUTO AIR CONDITIONER].)
• Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [WATER HEATER SYSTEM].) (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].
• Is the same DTC present?
Yes
Replace the climate control unit, then go to the next step.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
4
VERIFY THAT NO OTHER DTCs ARE RECORDED
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.