B1242

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

DESCRIPTION

The door control receiver is used to receive radio waves relating to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly by identifying a key code based on the radio waves received via the door control receiver. The door control receiver receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network 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 (ex. if door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).





WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
* When replacing or inspecting the door control receiver and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the door control receiver, smart and wireless function performance may be affected.
* Before performing the inspection, check that there are no problems related to the CAN communication system How To Proceed With Troubleshooting.
* When replacing the door control receiver, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal Registration.*
* It is necessary to perform initialization Initialization after registration Registration of the transmitter IDs into the door control receiver if the door control receiver has been replaced.*
* This DTC is not detected within 10 seconds after the power switch turned to off from on (IG).
* *: w/ Tire Pressure Warning System

PROCEDURE

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the door control receiver connector.





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

Standard Voltage:

w/ Daytime Running Light Control





Standard Resistance:

w/ Daytime Running Light Control





* *1: w/ Tire Pressure Warning

* *2: w/o Tire Pressure Warning

Standard Voltage:

w/o Daytime Running Light Control





Standard Resistance:

w/o Daytime Running Light Control





Text in Illustration





Result:





B -- REPLACE DOOR CONTROL AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY Removal

C -- REPLACE DOOR CONTROL RECEIVER Removal
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the O2 and I86 certification ECU (smart key ECU assembly) connectors.

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

Standard Resistance:

w/ Daytime Running Light Control





* *1: w/ Tire Pressure Warning

* *2: w/o Tire Pressure Warning

Standard Resistance:

w/o Daytime Running Light Control





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal