FixVault
Home › Lexus › 2004 › RX 330 FWD › Repair and Diagnosis › External Pages › Different car › Section 437 (Lighting System - Diagnostics) › Light Control Switch Circuit › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step 1 when using the hand-held tester, and start from step 2 when not using the hand-held tester.

  1. READ VALUE OF HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to the ON position and press the hand-held tester main switch ON.
    3. Select the items below in the DATA LIST, and read the displays on the hand-held tester.

      BODY NO.1: 

      ITEM CONDITION CHART

      Item Measurement Item/Display (Range) Normal Condition Diagnostic Note
      DIMMER SW Headlight dimmer SW signal/ON or OFF ON: Headlight dimmer switch is in HI or FLASH position -
      DIMMER SW Headlight dimmer SW signal/ON or OFF OFF: Headlight dimmer switch is in LO position -
      HIGH FLASHER SW Headlight dimmer SW signal/ON or OFF ON: Headlight dimmer switch is in FLASH position -
      HIGH FLASHER SW Headlight dimmer SW signal/ON or OFF OFF: Headlight dimmer switch is in except FLASH position -
      F FOG LIGHT SW Front fog light SW signal/ON or OFF ON: Front fog light switch is ON position -
      F FOG LIGHT SW Front fog light SW signal/ON or OFF OFF: Front fog light switch is OFF position -
      AUTO LIGHT SW Auto light SW signal/ ON or OFF ON: Headlight dimmer switch is in AUTO position -
      AUTO LIGHT SW Auto light SW signal/ ON or OFF OFF: Headlight dimmer switch is in except AUTO position -
      HEAD LIGHT SW Head light control SW signal/ON or OFF ON: Light control switch is in HEAD position -
      HEAD LIGHT SW Head light control SW signal/ON or OFF OFF: Light control switch is in except HEAD position -
      TAIL LIGHT SW Taillight SW signal/ ON or OFF ON: Light control switch is in TAIL or HEAD position -
      TAIL LIGHT SW Taillight SW signal/ ON or OFF OFF: Light control switch is in OFF position -
    1. NG: Go to step 2. 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
  2. INSPECT HEADLAMP DIMMER SWITCH ASSY 
    1. Inspect the headlamp dimmer switch assy (See REPLACEMENT ).
    1. NG: REPLACE HEADLAMP DIMMER SWITCH ASSY (See  HEADLAMP DIMMER SWITCH ASSY  ) 
    2. OK: Go to next step. 
  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY 
    1. Measure the voltage according to the value (s) in the table below.

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      1N-2 - Body ground Headlamp dimmer switch LOW --> HIGH 10 to 14 V --> Below 1 V
      B4-15 - Body ground Headlamp dimmer switch LOW °FLASH 10 to 14 V --> Below 1 V
      B4-16 - Body ground Light control switch OFF --> AUTO 10 to 14 V --> Below 1 V
      B4-17 - Body ground Light control switch OFF --> TAIL 10 to 14 V --> Below 1 V
      B4-22 - Body ground Front fog lamp switch OFF --> ON 10 to 14 V --> Below 1 V
      B4-23 - Body ground Light control switch OFF --> HEAD 10 to 14 V --> Below 1 V
      Fig 1: Data List - Combination Switch
      G03007451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying Combination Switch Connector Terminals Front View
      G03007452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
About FixVault