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Home >> Lexus >> 2020 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Service Information) (2 Of 2) >> Rear Light Assembly >> On-Vehicle Inspection [10/2015 - 08/2019] >> Procedure

On-Vehicle Inspection [10/2015 - 08/2019]: Procedure

  1. INSPECT REAR LIGHT ASSEMBLY LH (for Turn Signal Light LED Type) 
    1. Disconnect the S31 rear combination light assembly LH connector.
    2. Disconnect the Z21 rear light assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S31-5 (TRN1) - Z21-4 (TRN4) Always Below 1 Ω
      S31-6 (TRN2) - Z21-5 (TRN3) Always Below 1 Ω
      S31-5 (TRN1) or Z21-4 (TRN4) - Body ground Always 10 kΩ or higher
      S31-6 (TRN2) - Z21-5 (TRN3) - Body ground Always 10 kΩ or higher

      If the result is not as specified, repair or replace the wire harness or connector.

    4. Reconnect the Z21 rear light assembly LH connector.
    5. Reconnect the S31 rear combination light assembly LH connector.
    6. Measure the voltage according to the value(s) in the table below.
      GTY630696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Rear Light Assembly LH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      Z21-4 (TRN4) - Z21-1 (E)*1 Power switch on (IG), left turn signal light blinking 11 to 14 V ←→ Below 1 V
      Z21-5 (TRN3) - Z21-1 (E)*2 Power switch on (IG), left turn signal light blinking 11 to 14 V ←→ Below 1 V
      1. *1: If the result is not as specified, there may be a malfunction in the turn signal light circuit of the rear combination light assembly LH. Inspect the rear combination light assembly LH.
      2. *2: If the result is not as specified, there may be a malfunction in the turn signal light circuit of the rear light assembly LH. Inspect the rear light assembly LH.
  2. INSPECT REAR LIGHT ASSEMBLY RH (for Turn Signal Light LED Type) 
    1. Disconnect the S33 rear combination light assembly RH connector.
    2. Disconnect the Z20 rear light assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S33-5 (TRN1) - Z20-4 (TRN4) Always Below 1 Ω
      S33-6 (TRN2) - Z20-5 (TRN3) Always Below 1 Ω
      S33-5 (TRN1) or Z20-4 (TRN4) - Body ground Always 10 kΩ or higher
      S33-6 (TRN2) - Z20-5 (TRN3) - Body ground Always 10 kΩ or higher

      If the result is not as specified, repair or replace the wire harness or connector.

    4. Reconnect the Z20 rear light assembly RH connector.
    5. Reconnect the S33 rear combination light assembly RH connector.
    6. Measure the voltage according to the value(s) in the table below.
      GTY630695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Rear Light Assembly RH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      Z20-4 (TRN4) - Z20-1 (E)*1 Power switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      Z20-5 (TRN3) - Z20-1 (E)*2 Power switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      1. *1: If the result is not as specified, there may be a malfunction in the turn signal light circuit of the rear combination light assembly RH. Inspect the rear combination light assembly RH.
      2. *2: If the result is not as specified, there may be a malfunction in the turn signal light circuit of the rear light assembly RH. Inspect the rear light assembly RH.
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