POWER DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1243

DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU (multiplex network body ECU) is detected, DTC B1243 will be stored.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK DTC OUTPUT

   
   

   1. Clear the DTCs (Click here).

   2. Recheck for DTCs.

      OK
      DTC B1243 is not output.

   
   
   • OK

     USE SIMULATION METHOD TO CHECK (Click here)

   • NGClick here
2. Click here

   CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (GSW VOLTAGE)

   
   

   1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

   2. Disconnect the H36 airbag sensor assembly connector.

   3. Connect the cable to the negative (-) auxiliary battery terminal.

   4. 

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

      Standard Voltage
      Tester Connection Condition Specified Condition H36-18 (GSW) - Body ground Power switch on (IG) 2.8 to 4.3 V

      Table 2. Text in Illustration

      *a	Front view of wire harness connector (to Airbag Sensor Assembly)

      Note:

      Turning the power switch on (IG) with the airbag sensor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

   
   
   • OKClick here
   • NGClick here
3. Click here

   REPLACE AIRBAG SENSOR ASSEMBLY

   
   

   1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

   2. Replace the airbag sensor assembly (Click here).

   
   
   • NEXTClick here
4. Click here

   CHECK DTC OUTPUT

   
   

   1. Clear the DTCs (Click here).

   2. Recheck for DTCs.

      OK
      DTC B1243 is not output.

   
   
   • OK

     END (AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)

   • NG

     REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

5. Click here

   CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   
   

   1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

   2. Disconnect the H36 airbag sensor assembly connector.

   3. Disconnect the 3B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H36-18 (GSW) - 3B-45 Always Below 1 Ω 3B-45 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Remove the instrument panel junction block assembly (Click here).

   2. 

      Remove the main body ECU (multiplex network body ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition MB-24 (GSW) - 3B-45 Always Below 1 Ω

      Table 3. Text in Illustration

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

   
   
   • OK

     REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

   • NG

     REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)