Smart Key System

DOOR LOCK: SMART KEY SYSTEM: B1242: Wireless Door Lock Tuner Circuit Malfunction
B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

* The tuner and the Luggage Compartment tuner are used as antennas for the entry and wireless door lock functions of the smart key system.

* The certification ECU decodes the requested smart key system operation by identifying a key code based on electric waves received via the tuner and the Luggage Compartment tuner. The ECU then sends a command, according to the requested operation, to each ECU. (e.g. If door lock operation is requested, the ECU sends a door lock command to the body ECU.)

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (CERTIFICATION ECU - TUNER)

(a) Disconnect the D39 ECU connector.

(b) Disconnect the L11 tuner connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT CERTIFICATION ECU

(a) Reconnect the D39 ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Voltage:

NG -- REPLACE CERTIFICATION ECU
OK -- Continue to next step.

3. CHECK WIRE HARNESS (TUNER - LUGGAGE COMPARTMENT TUNER)

(a) Disconnect the L21 tuner connector.

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

Resistance:

Result:

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

4. REPLACE TUNER (RECONFIRM DTC)

(a) Replace the tuner.

(b) Clear the DTC and repeat the procedure to re-check it Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is output.

OK -- END (TUNER IS DEFECTIVE)
NG -- Continue to next step.

5. REPLACE LUGGAGE COMPARTMENT TUNER (RECONFIRM DTC)

(a) Replace the luggage compartment tuner.

(b) Clear the DTC and repeat the procedure to re-check it Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is not output.

OK -- END (LUGGAGE COMPARTMENT TUNER IS DEFECTIVE)

NG -- REPLACE CERTIFICATION ECU