DTC B1202 or EEPROM error is indicated: Climate Control Unit Internal Error

NOTE:

Check the battery condition (see BATTERY TEST ) and the charging system (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING ).
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0), and then back to ON (II).
Wait for 6 seconds or more.
Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT HDS ).
Check for DTCs.
Is DTC B1202 or EEPROM error indicated?

YES -The climate control unit is faulty, replace the climate control unit.

NO -Intermittent failure. The climate control unit is OK at this time. Check for poor connections at the climate control unit 40P connector.