WIRELESS DOOR LOCK CONTROL SYSTEM, 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 (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 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.

  • Wire harness or connector

  • Door control receiver

  • Certification ECU (Smart key ECU assembly)

WIRING DIAGRAM

A005B5PE87
A005B5PE88

CAUTION / NOTICE / HINT

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.

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

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

  • When replacing the door control receiver, 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 (See page) after registration Click here of the transmitter IDs into the door control receiver if the door control receiver has been replaced.*


  • *: for 12 Pin Type

PROCEDURE


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the R42*1 or S12*2 door control receiver connector.


      • *1: for 12 Pin Type

      • *2: for 5 Pin Type

      A005B2NE02
      Text in Illustration
      *a Component with harness connected (Certification ECU (Smart Key ECU Assembly)) - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L196-5 (RCO) - L195-11 (E) Always Below 1 V → 4.5 to 5.5 V (Pulse generation)
      L196-17 (RDAM) - L195-11 (E) Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      L195-11 (E) - Body ground Always Below 1 Ω
      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 DOOR CONTROL RECEIVER Click here

    C

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


    1. Disconnect the L196 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

      L196-17 (RDAM) - R42-9 (DATA)*1

      L196-17 (RDAM) - S12-5 (DATA)*2

      		 Always Below 1 Ω

      L196-5 (RCO) - R42-10 (+5)*1

      L196-5 (RCO) - S12-4 (+5)*2

      		 Always Below 1 Ω

      R42-12 (GND) - Body ground*1

      S12-1 (GND) - Body ground*2

      		 Always Below 1 Ω

      L196-17 (RDAM) or R42-9 (DATA) - Body ground*1

      L196-17 (RDAM) or S12-5 (DATA) - Body ground*2

      		 Always 10 kΩ or higher

      L196-5 (RCO) or R42-10 (+5) - Body ground*1

      L196-5 (RCO) or S12-4 (+5) - Body ground*2

      		 Always 10 kΩ or higher

      • *1: for 12 Pin Type

      • *2: for 5 Pin Type


    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR