DTC U2101:54, U2101:55, U2101:56, U2101:64 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2902000

System malfunction location
•  U2101:54: Rear climate control unit configuration error (data not received)
•  U2101:55: Rear climate control unit configuration error (not configured)
•  U2101:56: Rear climate control unit configuration error (ineffective/non-interchangeable data read)
•  U2101:64: Rear climate control unit configuration error (error value read)
Detection condition
•  Rear climate control unit detects configuration data not record or data error
Fail-safe function
U2101:56
Malfunction determined when ignition switched ON
•  The configuration value is fixed at the value right before the malfunction.
Malfunction already exists when ignition switched ON
•  The configuration value is fixed at the value before the previous ignition off. If the value does not exist, set the configuration value to the following value.
?  Destination: North_America
Possible cause
Note
•  If power from the battery is interrupted, the front climate control unit will go into a non-configured state because the memory for the configuration information is erased. If the ignition is switched ON (engine off) at this time, DTC U2101:55 is detected.
•  Normally, the configuration is re-performed within 6 s after the ignition is switched ON (engine off).
•  After performing the configuration, DTC U2101:55 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
•  Rear 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
•  Clear the DTC from the climate control unit memory using the M-MDS.
•  Perform the DTC inspection for the climate control unit using the M-MDS.
•  Are the same DTCs displayed?
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
•  Switch the ignition off.
•  Perform the instrument cluster DTC inspection using the M-MDS.
•  Are any DTCs displayed?
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
•  Clear the DTC from the climate control unit memory using the M-MDS.
•  Perform the DTC inspection for the climate control unit using the M-MDS.
•  Are the same DTCs displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear climate control unit.
Go to the next step.
No
Go to the next step.
5
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 (FULL-AUTO AIR CONDITIONER)].)
No
DTC troubleshooting completed.