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Home >> Lexus >> 2010 >> LX 570 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting (Exterior) (Diagnostic Codes & Symptom Tests) >> Lighting System >> Back-up Light does not Illuminate >> Procedure

Back-up Light does not Illuminate: Procedure

  1. INSPECT PARK/NEUTRAL POSITION SWITCH 
    1. Remove the park/neutral position switch. Refer to INSPECTION .
      Fig 1: Identifying Park/Neutral Position Switch Connector Terminals
      GTY131721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Connection
      2 (RB) - 1 (RL) Shift lever in R Below 1 Ω
      2 (RB) - 1 (RL) Shift lever not in R 10 kΩ or higher

    NG → See step   4 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - BATTERY) 
    1. Disconnect the C19 switch connector.
      Fig 2: Identifying C19 Switch Connector
      GTY124653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      C19-2 (RB) - Body ground Engine switch on (IG) 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT - PARK/NEUTRAL POSITION SWITCH AND BODY GROUND) 
    1. Disconnect the C19 switch connector.
      Fig 3: Identifying C19 Switch f4 And f5 Light Connectors
      GTY154169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the f4 and f5 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      for LH 

      Tester Connection Condition Specified Condition
      C19-1 (RL) - f5-1 Always Below 1 Ω
      f5-2 - Body ground
      f5-1 - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      C19-1 (RL) - f4-1 Always Below 1 Ω
      f4-2 - Body ground
      f4-1 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  4. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to  REMOVAL - Step 3 
  5. REPLACE BACK-UP LIGHT. Refer to  REMOVAL