B1242 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1242 – Wireless Door Lock Tuner Circuit Malfunction
B1242 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1242 Possible Causes
Faulty Door Control Receiver,Door Control Receiver harness is open or shorted,Door Control Receiver circuit poor electrical connection,Faulty Multiplex Network Body ECU
The door control receiver is used to receive electrical waves relating to the entry functions of the smart access system with push-button start (for Entry Function). The certification ECU (smart key ECU assembly) decodes the requested smart access system with push-button start (for Entry Function) operation by identifying a key code based on the electric waves received via the door control receiver. The door control receiver receives a signal from the door control transmitter and sends signals to the main body ECU (cowl side junction block LH) 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 (ex. if door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU).