DTC B27C0-57: Digital Key System Invalid/Incompatible Software Component [10/2023 - ]: Procedure

Pre-procedure1

1. Disconnect the G212 certification ECU (smart key ECU assembly) connector.
2. Disconnect the L301 digital key ECU assembly connector.

   Procedure1

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G212-17 (UAT2) - L301-23 (UART)	Always	Below 1 Ω
   G212-17 (UAT2) or L301-23 (UART) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Connect the G212 certification ECU (smart key ECU assembly) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Clear the DTCs.

   Body Electrical > Smart Access > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   Result

   Result	Proceed to
   B27C0-57 is not output	A
   B27C0-57 is output	B

Result: 

A 

REPLACE DIGITAL KEY ECU ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

Result: 

B 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2023 - ]