Wireless Door Lock Control System (w/ Smart Key System)

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (w/ Smart Key System): B1242: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

- The electrical key antenna is used to receive electric waves relating to the entry functions of the smart key system with push-button start. The certification ECU (smart key ECU assembly) decodes the requested smart key 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 door control receiver receives a signal from the wireless door control transmitter and sends signals to the main body ECU through the certification ECU (smart key ECU assembly).
- The certification ECU (smart key ECU assembly) 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.)





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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




(a) Disconnect the D40 certification ECU (smart key ECU assembly) connector and O26 door control receiver 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.
2. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Reconnect the D40 certification ECU (smart key ECU assembly) connector.




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






NG -- REPLACE DOOR CONTROL RECEIVER
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)