Click here

WIRELESS DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1242

Click here
Click here Click here
DTC Code DTC Name
B1242 Wireless Door Lock Tuner Circuit Malfunction
Click here

DESCRIPTION

The door control receiver is used to receive electrical waves relating to the entry functions of the entry and start system. The certification ECU (smart key ECU assembly) decodes the requested entry and start system 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 (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).

DTC No. DTC Detection Condition Trouble Area
B1242

  • Short in RDA or RSSI to ground between the certification ECU (smart key ECU assembly) and the door control receiver.

  • Short in RDA or RSSI to ground when RC0 (5 V) output from the ECU is off.

  • Wire harness or connector

  • Door control receiver

  • Certification ECU (Smart key ECU assembly)
Click here

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Note:

  • 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, entry and wireless function performance may be affected.

  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.

Click here

PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND)


    1. A01NMVCE03

      Disconnect the F58 and O1 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the O22 door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-16 (RSSI) - O22-2 (RSSI) Always Below 1 Ω
      O1-15 (RDA) - O22-5 (DATA) Always Below 1 Ω
      O1-5 (RC0) - O22-4 (+5) Always Below 1 Ω
      F58-15 (E) - Body ground Always Below 1 Ω
      O22-1 (GND) - Body ground Always Below 1 Ω
      O1-16 (RSSI) or O22-2 (RSSI) - Body ground Always 10 kΩ or higher
      O1-15 (RDA) or O22-5 (DATA) - Body ground Always 10 kΩ or higher
      O1-5 (RC0) or O22-4 (+5) - Body ground Always 10 kΩ or higher
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))
      *2

      Front view of wire harness connector

      (to Door Control Receiver)

  2. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. A01NK3ME13

      Reconnect the F58 and O1 certification ECU (smart key ECU assembly) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O1-5 (RC0) - F58-15 (E) Power switch off, all doors closed and transmitter switch pressed 4.5 to 5.5 V
      Table 2. Text in Illustration
      *1

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

  3. Click here

    REPLACE DOOR CONTROL RECEIVER


    1. Temporarily replace the door control receiver with a new one (Click here).


  4. Click here

    CHECK FOR DTC


    1. Clear the DTC (Click here).

    2. Recheck for DTCs.

      OK
      DTC B1242 is not output.

  5. Click here

    END (DOOR CONTROL RECEIVER WAS DEFECTIVE)

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)