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Inspection Procedure

  1. INSPECT FUSE (ACC, AM1, RADIO NO. 1) 
    1. Remove the ACC fuse from the main body ECU.
    2. Remove the AM1 fuse and RADIO NO. 1 fuse from the engine room R/B.
    3. Measure the resistance of the fuses.

      Standard resistance: Below 1 Ω 

    4. Reinstall the fuses.

    NG: REPLACE FUSE 

    OK: Go TO NEXT STEP 

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY AND BODY GROUND) 
    1. Disconnect the E41 receiver connector.
    2. Measure the voltage.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      E41-4 (B) - Body ground Always 11 to 14V
      E41-3 (ACC) - Body ground Ignition switch ACC 11 to 14 V
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      E41-7 (GND) - Body ground Below 1 Ω
      Fig 1: Identifying Radio Receiver Connector Terminals
      G05114069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the receiver connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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