WIRELESS DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1242

DTC Code DTC Name
B1242 Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

The electrical key and TPMS receiver assembly is used to receive radio waves related 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 operation by identifying a key code based on the radio waves received via the electrical key and TPMS receiver assembly. The electrical key and TPMS receiver assembly 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). (ex. if a 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. Detection Item DTC Detection Condition Trouble Area
B1242 Wireless Door Lock Tuner Circuit Malfunction

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

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

  • Harness or connector

  • Electrical key and TPMS receiver assembly

  • Certification ECU (smart key ECU assembly)

WIRING DIAGRAM

A00269PE04

CAUTION / NOTICE / HINT

Note


  • When replacing or inspecting the electrical key and TPMS receiver assembly and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the electrical key and TPMS receiver assembly, entry and wireless function performance may be affected.

  • This DTC is not stored within 10 seconds of the power switch being turned from on (IG) to off.

  • The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

    Click here

  • When replacing the electrical key and TPMS receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the GTS and write them down before removal.

    Click here

  • It is necessary to perform initialization () after registration ( Click here) of the transmitter IDs into the electrical key and TPMS receiver assembly if the electrical key and TPMS receiver assembly has been replaced.

  • If the certification ECU (smart key ECU assembly) is replaced, refer to the entry and start system (for Entry Function).

    Click here

PROCEDURE


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the P47 electrical key and TPMS receiver assembly connector.

      A0026NTC19
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G41-11 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G39-18 (RCO) - G41-11 (E) Always

      Below 1 V → 4.5 to 5.5 V

      (Pulse generation)
      G39-20 (RDAM) - G41-11 (E) Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ELECTRICAL KEY AND TPMS RECEIVER ASSEMBLY Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY AND TPMS RECEIVER ASSEMBLY - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] AND BODY GROUND)


    1. Disconnect the G39 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the P47 electrical key and TPMS receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G39-20 (RDAM) - P47-9 (DATA) Always Below 1 Ω
      G39-18 (RCO) - P47-10 (+5) Always Below 1 Ω
      G39-20 (RDAM) or P47-9 (DATA) - Body ground Always 10 kΩ or higher
      G39-18 (RCO) or P47-10 (+5) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR