Dtc B2602 Key Unlock Warning Switch Circuit Malfunction

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC 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 assembly 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 Item
Trouble Area
B2602
Both of the following conditions continue:
  1. A key code confirmation signal is off
  1. The engine switch is on (IG)
  1. Multiplex communication system
  2. Entry and start system
  3. Multiplex tilt & telescopic ECU
B2606
IG signals and/or key code confirmation signals are not received correctly.
  1. Multiplex communication system
  2. Entry and start system
  3. Multiplex tilt & telescopic ECU

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2602 Key Unlock Warning Switch Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK OTHER DTC OUTPUT
HINT:
The power tilt & power telescopic steering column system uses the multiplex 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:
    1. If DTC B2621 besides B2602 and B2606 is output, perform troubleshooting for this DTC first.
    2. DTC B2621 indicates a communication interruption for the power tilt & power telescopic steering column system.


B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A


2.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

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

  1. Select "Key Code Confirm(MPX)" and "IG Switch (MPX)" from the data list.

  1. Check the communication state of the tester screen.

    Tilt & Telescopic:

    Item
    		Measurement Item/Range (Display)
    		Normal Condition
    Key Code Confirm(MPX)
    		Communication state of key code confirmation signal/ON or OFF
    		ON: Communication is normal
    OFF: Communication is interrupted
    IG Switch (MPX)
    		Communication state of engine switch/ON or OFF
    		ON: Communication is normal
    OFF: Communication is interrupted
    OK:
    "ON" is displayed.


NG
CHECK ENTRY AND START SYSTEM
OK


3.RECONFIRM DTC

  1. Clear the DTC.

  1. Check for DTCs.

    OK:
    DTC B2602 and/or B2606 is not output.


NG
REPLACE MULTIPLEX TILT & TELESCOPIC ECU
OK

END