WIRELESS DOOR LOCK CONTROL SYSTEM(w/ Power Switch), Diagnostic DTC:B1242

DTC Code DTC Name
B1242 Wireless Door Lock Tuner Circuit Malfunction

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 electrical key transmitter sub-assembly 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 (ex. if door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU).

DTC No. DTC Detection Condition Trouble Area
B1242

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

  • Short in RDAM to ground when RCO (5 V) output from the ECU is off.

  • Door control receiver

  • Harness or connector

  • Certification ECU (Smart Key ECU Assembly)

WIRING DIAGRAM

A01UZ4WE65

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle power switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The wireless door lock control system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) precaution Click here.

  • 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.

PROCEDURE


  1. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01UXUKE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Door Control Receiver)

    1. Disconnect the K11 door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K11-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      K11-4 (+5) - K11-1 (GND) Always

      Below 1 V → 4.5 to 5.5 V

      (Pulse generation)
      K11-5 (DATA) - K11-1 (GND) Always 11 to 14 V

    OK

    REPLACE DOOR CONTROL RECEIVER Click here

    NG

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


    1. Disconnect the F46 and F48 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the K11 door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F46-15 (RCO) - K11-4 (+5) Always Below 1 Ω
      F46-6 (RDAM) - K11-5 (DATA) Always Below 1 Ω
      F46-7 (CSEL) - K11-2 (CSEL) Always Below 1 Ω
      F48-1 (E) - Body ground Always Below 1 Ω
      K11-1 (GND) - Body ground Always Below 1 Ω
      F46-15 (RCO) - Body ground Always 10 kΩ or higher
      F46-6 (RDAM) - Body ground Always 10 kΩ or higher
      F46-7 (CSEL) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR