DTC B2602: Key Unlock Warning Switch Circuit Malfunction; DTC B2606: Key Code Confirm Signal Malfunction [09/2015 - ]: Procedure

HINT: 

The power tilt and power telescopic steering column system uses the CAN communication system, so check its diagnostic system before proceeding to troubleshooting.

1. Check if DTC B2621 is output.

   Result

   DTC Condition	Proceed to
   No output	A
   B2621 is output	B

   HINT: 

   • If DTC B2621 besides B2602 and B2606 are output, perform troubleshooting for B2621 first.
   • DTC B2621 indicates a communication interruption for the power tilt and power telescopic steering column system.

Result:  B

B 

REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

(Refer to DTC B2621: Communication Interruption [09/2015 - ] )

Result:  A

A 

See step  2

1. Use the Data List to check if the communication state of key code, IG and key SW is functioning properly.
   TILT & TELESCOPIC:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG Switch (CAN)	Communication state of engine switch / ON or OFF	ON: Communication is normal OFF: Communication is interrupted	-
   Key Code Confirm(CAN)	Communication state of key code confirmation signal / ON or OFF	ON: Communication is normal OFF: Communication is interrupted	-

   OK

   "ON" is displayed.

Result:  NG

NG 

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

Result:  OK

OK 

See step  3

1. Clear the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
2. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

   OK

   DTC B2602 and/or B2606 is not output.

Result:  OK

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

Result:  NG

NG 

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU 

(Refer to REMOVAL [09/2015 - ] )