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HOMESERVICE MANUALSTOYOTA2018PRIUS TWO ECOREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTAUDIO / VIDEO SYSTEM - SYMPTOM TESTSAUDIO AND VISUAL SYSTEMREVERSE SIGNAL CIRCUIT [08/2019 - ]PROCEDURE
2018 Toyota Prius Two Eco

Reverse Signal Circuit [08/2019 - ]: Procedure

2018 Toyota Prius Two EcoSECTION Procedure
  1. CHECK BACK-UP LIGHT 
    1. Select reverse (R) and check that the back-up lights come on.

      OK

      The back-up lights come on.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO LIGHTING SYSTEM 

    w/ AFS: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2018 - 07/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ]

    w/o AFS: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - 07/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ]

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL) 
    1. Disconnect the F118 radio and display receiver assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F118-28 (REV) - Body ground Power switch on (IG)
      Reverse (R) selected      		 11 to 14 V
      F118-28 (REV) - Body ground Power switch on (IG)
      Shift state other than reverse (R) selected      		 Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2019 - 07/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [07/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.