2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT FUSE (ECU-B, ACC) 
    1. Disconnect the ECU-B and ACC fuses from the driver side junction block.
    2. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (MULTI-DISPLAY - BATTERY AND BODY GROUND) 
    1. Disconnect the M13 connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      M13-1 (GND1) - Body ground*1 Below 1 Ω
      M13-3 (GND1) - Body ground*2 Below 1 Ω
    3. Measure the voltage of the wire harness side connector.
      Fig 1: Identifying M13 Connector
      G05189913Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      M13-2 (ACC) - Body ground*1 Power switch ON (ACC) 10 to 14 V
      M13-3 (+B1) - Body ground*1 Always 10 to 14 V
      M13-11 (ACC) - Body ground*2 Power switch ON (ACC) 10 to 14 V
      M13-12 (+B1) - Body ground*2 Always 10 to 14 V
      HINT:
      • *1: for 4 Connector type
      • *2: for 3 Connector type

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

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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.

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