DTC 2-1: EEPROM Communication Error; DTC 2-2: EEPROM Checksum Error: Procedure

1. Exit diagnosis mode and wait for 10 seconds.
2. Disconnect the cable from the negative (-) battery terminal, and wait for 1 minute.
3. Reconnect the cable to the negative (-) battery terminal, and wait for 10 seconds.
4. Turn the ignition switch ON, and then check for the current DTC again.

   Result

   Result	Proceed to
   Current DTC 2-1 or 2-2 exists	A
   Historic DTC 2-1 or 2-2 exists	B

B → CLEAR HISTORIC DTC 

A: Go to next step 

1. Press the "SERVICES" button and check the LEXUS Link condition with the LEXUS Link call center.

   OK

   System operates normally.

   NG

   Current DTC 2-1 or 2-2 exists.

   NOTE:

   If replacement of the ECU is necessary, replace the mayday battery (backup battery) together with the ECU. After the replacement, register the ECU. Refer to REGISTRATION .

NG → See step   3 

OK → END