ACTIVE REAR WING SYSTEM, Diagnostic DTC:B1318

DTC Code DTC Name
B1318 Short in Manual Switch Circuit

DESCRIPTION

This DTC is stored when the No. 4 combination switch assembly (spoiler control switch) is determined to be stuck on or there is a short in the No. 4 combination switch assembly (spoiler control switch) circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1318 Short in Manual Switch Circuit When voltage at terminal ECUB of the spoiler control ECU assembly is 9 V or more, the No. 4 combination switch assembly (spoiler control switch) is stuck on for 30 seconds or more.

  • No. 4 combination switch assembly (spoiler control switch)

  • Spoiler control ECU assembly

  • Harness or connector

WIRING DIAGRAM

B000T22E01

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Active Rear Wing / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Active Rear Wing > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Manual Switch No. 4 combination switch assembly (Spoiler control switch) condition OFF or ON

      OFF: No. 4 combination switch assembly (Spoiler control switch) not pressed

      ON: No. 4 combination switch assembly (Spoiler control switch) pressed

      		 -

      Body Electrical > Active Rear Wing > Data List
      Tester Display
      Manual Switch
      OK
      The GTS display changes according to the No. 4 combination switch assembly (spoiler control switch).
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SPOILER CONTROL ECU ASSEMBLY Click here

    NG

  2. INSPECT NO. 4 COMBINATION SWITCH ASSEMBLY (SPOILER CONTROL SWITCH)


    1. Remove the No. 4 combination switch assembly (spoiler control switch).

      Click here

    2. Inspect the No. 4 combination switch assembly (spoiler control switch).

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE NO. 4 COMBINATION SWITCH ASSEMBLY (SPOILER CONTROL SWITCH) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SPOILER CONTROL ECU ASSEMBLY - NO. 4 COMBINATION SWITCH ASSEMBLY [SPOILER CONTROL SWITCH])


    1. Disconnect the X79 spoiler control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X79-14 (MSW) or P78-1(ECU) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    OK

    REPLACE SPOILER CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR