Dtc B2602 Key Unlock Warning Switch Circuit Malfunction

Lexus IS250 IS220d GSE20 ALE20 - STEERING COLUMN

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT

READ VALUE OF INTELLIGENT TESTER

RECONFIRM DTC

DTC B2602 Key Unlock Warning Switch Circuit Malfunction

DTC B2606 Key Code Confirm Signal Malfunction

DESCRIPTION

A key code confirmation signal (ON or OFF) is sent from the power source control ECU to the multiplex tilt & telescopic ECU via the communication bus.


The multiplex tilt & telescopic ECU uses this signal to operate the auto away/return function.

DTC No.Detection ItemTrouble Area
B2602Both of the following conditions continue:
A key code confirmation signal is off
The engine switch is on (IG)
Multiplex communication system
Entry and start system
Multiplex tilt & telescopic ECU
B2606IG signals and/or key code confirmation signals are not received correctly.
Multiplex communication system
Entry and start system
Multiplex tilt & telescopic ECU

WIRING DIAGRAM

Dtc B2602 Key Unlock Warning Switch Circuit Malfunction. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK ANY OTHER DTCS OUTPUT
  • HINT:
  • The power tilt & power telescopic steering column system uses the multiplex communication system, so check its diagnostic system before proceeding to troubleshooting.

Check if DTC B2621 is output.

  • Result:
  • DTC ConditionProceed to
    No outputA
    B2621 is outputB
  • 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 & power telescopic steering column system.
B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A
2.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the intelligent tester on.

Select "Key Code Confirm (MPX)" and "IG Switch (MPX)" from the DATA LIST.

Check the communication state of the tester screen.

TILT & TELESCO:
ItemMeasurement Item/Range (Display)Normal Condition
Key Code Confirm (MPX)Communication state of key code confirmation signal / ON or OFFON: Communication is normal
OFF: Communication is interrupted
IG Switch (MPX)Communication state of engine switch / ON or OFFON: Communication is normal
OFF: Communication is interrupted
  • OK:
  • "ON" is displayed.
NG
CHECK ENTRY AND START SYSTEM
OK
3.RECONFIRM DTC

Clear the DTC.

Check for DTCs.

  • OK:
  • DTC B2602 and/or B2606 is not output.
NG
REPLACE MULTIPLEX TILT & TELESCOPIC ECU
OK
END