LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2014 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Diagnostics) >> Automatic Transmission System >> Paddle Shift Switch System >> Inspection steps
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection steps

  1. Reading of SSM3 data (UP SW/DOWN SW)
    1. Connect the SSM3 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Use SSM3 to display the [Current Data Display & Save] screen according to the screen display and check the computer data recorded when the transmission shift switch of the steering wheel ASSY is operated to +/-.
      SSM3 SCREEN: [TRANSMISSION CONTROL SYSTEM] →[CURRENT DATA DISPLAY & SAVE] →[NORMAL SAMPLING]

      Item name [Symbol] Item description Display range Normal value Remarks
      UP SW Indicating transmission control switch (+) ON/OFF Release →pull the shift switch "+" lever. OFF →ON -
      DOWN SW Indicating transmission control switch (-) ON/OFF Release →pull the shift switch "-" lever. OFF →ON -

      NG: Step 2

      OK: Inspection for problems that do not normally occur (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )

  2. Check wiring harness and connector (transmission shift switch - transmission control computer)
    1. Disconnect the connector A19 of the transmission control computer ASSY.
    2. Check the resistance of the terminals. (Refer to ECM TERMINAL ARRANGEMENT  for terminal arrangement of transmission control computer ASSY)
      RESISTANCE

      Inspection terminals Inspection conditions Standard value
      A19-1 (SFTD) - chassis ground Shift switch Pull the "+" lever. Less than 1 Ω
      A19-1 (SFTD) - chassis ground A19-2 (SFTU) - chassis ground Neutral position 10 k Ωor more
      A19-2 (SFTU) - chassis ground Shift switch Pull the "-" lever. Less than 1 Ω
    3. Connect the connector A19 of the transmission control computer ASSY.

      NG: Step  4

      OK: Go to Next Step

  3. Replacement of transmission control computer
    1. Replace the transmission control computer ASSY. (Refer to TRANSMISSION CONTROL COMPUTER ASSY )

      Next: AT unit correction

  4. Check wiring harness and connector (spiral cable - chassis ground)
    1. Disconnect the spiral cable connector A from the spiral cable.
    2. Measure the resistance of the spiral cable vehicle side terminal.
      RESISTANCE

      Terminal No. (terminal symbol) Inspection conditions Standard value
      A-7 - chassis ground Always Less than 1 Ω
    3. Connect the spiral cable connector A to the spiral cable.

      NG: Check and replacement of wiring harness and connector

      OK: Go to Next Step

  5. Check wiring harness and connector (spiral cable - transmission control computer)
    1. Disconnect the connector A19 of the transmission control computer ASSY.
    2. Disconnect the spiral cable connector A from the spiral cable.
    3. Measure the resistance between the terminals.
      RESISTANCE

      Inspection terminals Inspection conditions Standard value
      A19-1 (SFTD) - A-2 Always Less than 1 Ω
      A19-2 (SFTU) - A-1 Always Less than 1 Ω
      RESISTANCE

      Inspection terminals Inspection conditions Standard value
      A19-1 (SFTD) and A-2 -chassis ground Always 10 k Ωor more
      A19-2 (SFTU) and A-1 -chassis ground Always 10 k Ωor more
    4. Connect the connector A19 of the transmission control computer ASSY.
    5. Connect the spiral cable connector A to the spiral cable.

      NG: Check and replacement of wiring harness and connector

      OK: Go to Next Step

  6. Transmission shift switch check (transmission shift switch - spiral cable)
    CAUTION: Refer to SRS AIRBAG SYSTEM for airbag handling and working precautions
    1. Remove the horn button ASSY.
      NOTE: Refer to DRIVER SIDE AIR BAG MODULE for horn button ASSY removal
    2. Disconnect the connector C of the spiral cable.
    3. Measure the resistance between the terminals.
      RESISTANCE

      Inspection terminals Inspection conditions Standard value
      C-4 - C-1 Shift switch Pull the "+" lever. Less than 1 Ω
      C-4 - C-1
      C-3 - C-1      		 Shift switch Neutral position 10 k Ωor more
      C-3 - C-1 Shift switch Pull the "-" lever. Less than 1 Ω
    4. Connect the connector C of the spiral cable.

      NG: Step 7

      OK: Spiral cable SUB-ASSY check (refer to STEERING ROLL CONNECTOR )

  7. Check of transmission shift switch unit
    1. Remove the transmission shift switch. (Refer to TRANSMISSION SHIFT SWITCH )
    2. Check the transmission shift switch unit. (Refer to INSTALLATION )

      NG: Replacement of transmission shift switch (refer to TRANSMISSION SHIFT SWITCH )

      OK: Check and replacement of switch wire (refer to TRANSMISSION SHIFT SWITCH )

scientia non olet · About LEMON Manuals