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

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. This DTC is stored when the applicable RDA signal cannot be received within 1 second of the PRG signal being output from the main body ECU.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CLEAR DTC

   
   

   1. Clear the DTCs (Click here).

   
   
   • NEXTClick here
2. Click here

   CHECK FOR DTC

   
   

   1. Check for DTCs (Click here).

      OK
      DTC B1242 is not output.

   
   
   • OKClick here
   • NGClick here
3. Click here

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

   
   
   1. 

      Disconnect the H81 ECU connector.

   2. Disconnect the O14 receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H81-5 (RDA) - O14-2 (RDA) Always Below 1 Ω H81-6 (PRG) - O14-3 (PRG) H81-5 (RDA) or O14-2 (RDA) - Body ground Always 10 kΩ or higher H81-6 (PRG) or O14-3 (PRG) - Body ground

      Table 1. Text in Illustration

      *1	Front view of wire harness connector (to Main Body ECU)
      *2	Front view of wire harness connector (to Door Control Receiver)

   
   
   • OKClick here
   • NGClick here
4. Click here

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

   
   
   1. 

      Disconnect the O14 receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition O14-1 (GND) - Body ground Always Below 1 Ω

      Standard Voltage
      Tester Connection Condition Specified Condition O14-5 (+B) - Body ground Always 11 to 14 V

      Table 2. Text in Illustration

      *1	Front view of wire harness connector (to Door Control Receiver)

   
   
   • OKClick here
   • NGClick here
5. Click here

   REPLACE DOOR CONTROL RECEIVER

   
   

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

   2. Perform the registration procedures (Click here).

   
   
   • NEXTClick here
6. Click here

   CLEAR DTC

   
   

   1. Clear the DTCs (Click here).

   
   
   • NEXTClick here
7. Click here

   CHECK FOR DTC

   
   

   1. Check for DTCs (Click here).

      OK
      DTC B1242 is not output.

   
   
   • OKClick here
   • NGClick here
8. Click here

   END (DOOR CONTROL RECEIVER IS DEFECTIVE)

9. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

10. Click here

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

11. Click here

    USE SIMULATION METHOD TO CHECKClick here