LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2015 >> GS 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (4 Of 4) & Circuit Tests >> SFI System >> Circuit Tests >> Starter Signal Circuit [09/2014 - 10/2015] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Starter Signal Circuit [09/2014 - 10/2015]: Procedure

  1. READ VALUE USING TECHSTREAM (STARTER SIGNAL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
    5. Read the value.

      OK

      Engine Switch Position Starter Signal
      On (IG) Close (Starter signal OFF)
      START Open (Starter signal ON)

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [09/2014 - 10/2015] )

    Result: 

    NG 

    See step  2

  2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Inspect the park/neutral position switch assembly (for 2WD) (Refer to INSPECTION [09/2014 - ] ).
    2. Inspect the park/neutral position switch assembly (for AWD) (Refer to INSPECTION [09/2014 - ] ).
      RESULT

      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

    Result: 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    (Refer to REMOVAL [09/2014 - ] )

    Result: 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    (Refer to REMOVAL [09/2014 - ] )

    Result: 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM) 
    1. Disconnect the park/neutral position switch connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      F48-5 (L) - A21-20 (STA) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      F48-5 (L) or A21-20 (STA) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

    (Refer to Engine does not Start [09/2014 - 10/2015] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR