WIRELESS DOOR LOCK CONTROL SYSTEM(w/ Smart Entry and Start System), Diagnostic DTC:B1242

DTC Code DTC Name
B1242 Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

The door control receiver 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 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). (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 to ground in RDAM terminal circuit between the certification ECU (smart key ECU assembly) and door control receiver.

  • Short to ground in RDAM terminal circuit when voltage (5 V) is not being output from terminal RCO

  • Wire harness or connector

  • Door control receiver

  • Certification ECU (smart key ECU assembly)

WIRING DIAGRAM


  1. for 12 Pin Type

    B0086CDE01

  2. for 5 Pin Type

    B0085C4E03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key(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.

  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

  • When replacing or inspecting the electrical key and tire pressure monitoring system 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 tire pressure monitoring system receiver assembly, the performance of the entry function and wireless function may be affected.

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

  • Make sure that there are no electrical key transmitter sub-assemblies in the vehicle.

  • When replacing the electrical key and tire pressure monitoring system 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


    • for 12 Pin Type

  • If the electrical key and tire pressure monitoring system receiver assembly has been replaced, it is necessary to perform initialization (Click here ) after registration Click here of the transmitter IDs to the electrical key and tire pressure monitoring system receiver assembly.*


    • for 12 Pin Type

PROCEDURE


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the R9*1 or R14*2 door control receiver connector.


      • *1: for 12 Pin Type

      • *2: for 5 Pin Type

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

      B0086XNC16
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      K62-18 (E) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      R8-19 (RDAM) - K62-18 (E) Always 11 to 14 V
      R8-18 (RCO) - K62-18 (E) Always Below 1 V → 4.5 to 5.5 V pulse generation at regular intervals
      Result
      Result Proceed to
      OK (for 12 Pin Type) A
      OK (for 5 Pin Type) B
      NG C

    A

    REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY Click here

    B

    REPLACE SMART DOOR CONTROL RECEIVER ASSEMBLY Click here

    C

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


    1. Disconnect the R8 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      R8-19 (RDAM) - R9-2 (DATA)*1

      R8-19 (RDAM) - R14-5 (DATA)*2

      		 Always Below 1 Ω

      R8-18 (RCO) - R9-8 (+5)*1

      R8-18 (RCO) - R14-4 (+5)*2

      		 Always Below 1 Ω

      R9-12 (GND) - Body ground*1

      R14-1 (GND) - Body ground*2

      		 Always Below 1 Ω

      R9-2 (DATA) or R8-19 (RDAM) - Other terminals and body ground*1

      R14-5 (DATA) or R8-19 (RDAM) - Other terminals and body ground*2

      		 Always 10 kΩ or higher

      R9-8 (+5) or R8-18 (RCO) - Other terminals and body ground*1

      R14-4 (+5) or R8-18 (RCO) - Other terminals and body ground*2

      		 Always 10 kΩ or higher

      • *1: for 12 Pin Type

      • *2: for 5 Pin Type

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR