Smart Access System With Push-Button Start

DOOR LOCK: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: B1242: Wireless Door Lock Tuner Circuit Malfunction
B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

* The electrical key antenna and the door control receiver are used as antennas for the entry and wireless door lock functions of the smart access system with push-button start.

* The certification ECU decodes the requested smart access system with push-button start operation by identifying a key code based on electric waves received via the electrical key antenna and the door control receiver. 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 main body ECU RH.)





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)

(a) Disconnect the P33 ECU connector.





(b) Disconnect the P31 receiver connector.

(c) 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.

2. CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - ELECTRICAL KEY ANTENNA)

(a) Disconnect the P20 antenna connector.





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

HINT
Perform the measurement with the P31 receiver connector disconnected.

Standard resistance:





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

3. CHECK AND REPLACE DOOR CONTROL RECEIVER (RECONFIRM DTC)

(a) Replace the receiver.

(b) Clear the DTC and repeat the procedure to re-check for DTCs Smart Access System With Push-Button Start.

OK:

DTC is not output.

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

4. CHECK AND REPLACE ELECTRICAL KEY ANTENNA (RECONFIRM DTC)

(a) Replace the antenna.

(b) Clear the DTC and repeat the procedure to re-check for DTCs Smart Access System With Push-Button Start.

OK:

DTC is not output.

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

5. INSPECT CERTIFICATION ECU

(a) Reconnect the P33 ECU connector.





(b) Reconnect the P20 antenna connector.

(c) Reconnect the P31 receiver connector.

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

Standard voltage:





NG -- REPLACE CERTIFICATION ECU

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE