DTC    B2602    Key Unlock Warning Switch Circuit Malfunction

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DESCRIPTION

A signal (ON or OFF) is sent from the main body ECU to the multiplex tilt and telescopic ECU via the CAN communication bus when the ignition key is inserted into the key cylinder. The multiplex tilt and telescopic ECU uses this signal to operate the auto away/return function.

DTC Code
Detection Condition
Trouble Area
B2602
When both conditions below are met:
  1. Unlock warning switch signal is OFF.
  2. Ignition switch is turned ON.
  1. Unlock warning switch
  2. Unlock warning switch circuit
  3. Main body ECU
  4. Multiplex tilt and telescopic ECU

WIRING DIAGRAM


C159013E01


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.

  1. Check if the power tilt and telescopic steering column system DTC B2621 is output.

    Result 
    DTC Condition
    		Proceed to
    B2621 is not output
    		A
    B2621 is output
    		B

    HINT:
    1. If DTC B2621 is output, perform troubleshooting for B2621 first.
    2. DTC B2621 indicates a communication interruption for the power tilt and power telescopic steering column system.


B
REPAIR CIRCUIT INDICATED BY OUTPUT DTC (Click here)
A


2.READ VALUE USING TECHSTREAM (KEY SWITCH COMMUNICATION SIGNAL)

  1. Use the Data List to check if the key communication signal is functioning properly.

    Tilt & Telescopic 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Key Switch(CAN)
    		Communication state of unlock warning switch signal / ON or OFF
    		ON: Communication is normal
    OFF: Communication is interrupted
    		-
    Result 
    Result
    		Proceed to
    "OFF" is displayed.
    		A
    "ON" is displayed.
    		B


B
REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (Click here)
A


3.INSPECT UNLOCK WARNING SWITCH

C159210E03

  1. Disconnect the J18 connector from the unlock warning switch.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Unlock warning switch OFF (Ignition key is removed)
    		10 kΩ or higher
    1 - 2
    		Unlock warning switch ON (Ignition key is inserted)
    		Below 1 Ω


NG
REPLACE UNLOCK WARNING SWITCH (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - UNLOCK WARNING SWITCH)

C159208E01

  1. Disconnect the J1 main body ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J1-5 (KSW) - J18-1
    		Always
    		Below 1 Ω
    J1-5 (KSW) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - BODY GROUND)


    C159211E01

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J18-2 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU