B2602

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

DTC B2602 - Key Unlock Warning Switch Circuit Malfunction

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.

WIRING DIAGRAM

INSPECTION PROCEDURE

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

Result

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

B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (KEY SWITCH COMMUNICATION SIGNAL)
(a) Use the Data List to check if the key communication signal is functioning properly.

Tilt & Telescopic

Result

B -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
A -- Continue to next step.
3. INSPECT UNLOCK WARNING SWITCH

(a) Disconnect the J18 connector from the unlock warning switch.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPLACE UNLOCK WARNING SWITCH
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - UNLOCK WARNING SWITCH)

(a) Disconnect the J1 main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU