Lexus LX - DTC B2602 Key Unlock Warning Switch Circuit Malfunction

DTC B2602 Key Unlock Warning Switch Circuit Malfunction
DTC B2606 Key Code Confirm Signal Malfunction
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DESCRIPTION
A key code confirmation signal (ON or OFF) is sent from the main body ECU to the multiplex tilt and telescopic ECU via the communication bus.
The multiplex tilt and telescopic ECU uses this signal to operate the auto away/return function.
DTC Code Detection Condition Trouble Area
B2602
Both of the following conditions continue:
The key code confirmation signal is off.
The engine switch is on (IG).
CAN communication system
Entry and start system (for start function)
Multiplex tilt and telescopic ECU
B2606
IG signals and/or key code confirmation signals are not
received correctly.
CAN communication system
Entry and start system (for start function)
Multiplex tilt and telescopic ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1.CHECK OTHER DTC OUTPUT
HINT:
The power tilt and power telescopic steering column system uses the CAN communication system, so check its diagnostic system before proceeding
to troubleshooting.
a. Check if DTC B2621 is output.
Result
Result Proceed to
B2621 is not output A