B2602

STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: B2602,B2606: Key Unlock Warning Switch Circuit Malfunction

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 and telescopic ECU via the communication bus.
The multiplex tilt and telescopic ECU uses this signal to operate the auto away/return function.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OTHER DTC OUTPUT
HINT: The power tilt and power telescopic steering column system uses the multiplex communication system, so check its diagnostic system before proceeding to troubleshooting.
(a) Check if DTC B2621 is output.
Result:





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

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (COMMUNICATION STATE OF KEY CODE AND POWER SWITCH)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn the Techstream on.
(d) Check the communication state of key code and power switch. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

Tilt&Telescopic





OK:
"ON" is displayed.
NG -- CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC.
(b) Check for DTCs.
OK:
DTC B2602 and/or B2606 is not output.
NG -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
OK -- END