DTC B2602: Key Unlock Warning Switch Circuit Malfunction; DTC B2606: Key Code Confirm Signal Malfunction: Description

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

A key code confirmation signal (ON or OFF) is sent from the power source control ECU assembly 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 DETECTION ITEM AND TROUBLE AREA

DTC No	Detection Item	Trouble Area
B2602	Both of the following conditions continue A key code confirmation signal is off The engine switch is on (IG)	Multiplex communication system Smart access system with push-button start (for Start Function) Multiplex tilt and telescopic ECU
B2606	IG signals and/or key code confirmation signals are not received correctly	Multiplex communication system Smart access system with push-button start (for Start Function) Multiplex tilt and telescopic ECU