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Footwell Light Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Check that the footwell lights come on.
      MAIN BODY

      Tester Display Test Part Control Range Diagnostic Note
      Fr Foot Light Footwell lights ON/OFF Power switch is turned off just before performing the Active Test.

      OK

      Footwell lights come on.

    NG → See step   2 

    OK → See step   5 

  2. CHECK HARNESS AND CONNECTOR (DOME FUSE - NO. 1 INTERIOR ILLUMINATION LIGHT ASSEMBLY) 
    1. Disconnect the H47 No. 1 interior illumination light assembly LH connector.
    2. Disconnect the H48 No. 1 interior illumination light assembly RH connector.
    3. Disconnect the X14 No. 1 interior illumination light assembly LH connector.*1
    4. Disconnect the W13 No. 1 interior illumination light assembly RH connector.*1
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H47-2 (B) - Body ground Power switch off 11 to 14 V
      H48-2 (B) - Body ground Power switch off 11 to 14 V
      X14-2 (B) - Body ground*1 Power switch off 11 to 14 V
      W13-2 (B) - Body ground*1 Power switch off 11 to 14 V
      • *1: w/ Rear Footwell Light

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTERIOR ILLUMINATION LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H9 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H47-1 (E) - H9-20 (FSPT) Always Below 1 Ω
      H48-1 (E) - H9-20 (FSPT) Always Below 1 Ω
      X14-1 (E) - H9-20 (FSPT) Always Below 1 Ω
      W13-1 (E) - H9-20 (FSPT) Always Below 1 Ω
      H47-1 (E) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   4 

  4. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2013 - ] 
  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2013 - ]  
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