B1242

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: B1242: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

When a RDA signal is not input to the door control receiver within 1 second after the multiplex network body ECU outputs a PRG signal, this DTC is set.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - DOOR CONTROL RECEIVER)





(a) Disconnect the multiplex network body ECU (B6) connector and 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 DOOR CONTROL RECEIVER (+B TERMINAL)





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT)
OK -- Continue to next step.
3. INSPECT DOOR CONTROL RECEIVER (E TERMINAL)





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)
OK -- Continue to next step.
4. REPLACE DOOR CONTROL RECEIVER
(a) Reconnect the multiplex network body ECU connector.
(b) Replace the door control receiver.
(c) Perform the REGISTRATION procedures .
HINT: If there is a new door control receiver or one functioning normally available, connect it and check if the wireless door lock function is normal or the DTC is output. If the alternative receiver functions normally, replace the original door control receiver.

NEXT -- Continue to next step.
5. RECHECK DTC
(a) Clear the DTC .
(b) Check if the same DTC is detected.
HINT: Reinstall the sensors, connector, etc. and restore the vehicle to its previous condition before rechecking for DTCs.

Result:






B -- END
A -- REPLACE MULTIPLEX NETWORK BODY ECU