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Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. ADJUST SOUND QUALITY 
    1. Adjust the sound quality.
      1. Operate the radio receiver assy to adjust the sound quality.

        Standard: malfunction disappear. 

    1. OK: BAD SOUND QUALITY 
    2. NG: 
  2. COMPARE IT WITH ANOTHER CAR OF SAME MODEL 
    1. Compare it with another vehicle of the same model.
      1. Compare with the vehicle of the same type which does not have a trouble to see if there is any difference in the condition of trouble occurrence.

        Standard: No difference found. 

    1. OK: SETTING 
    2. NG: 
  3. CHECK HARNESS AND CONNECTOR (BETWEEN RADIO RECEIVER ASSY AND SPEAKER) 
    1. NG: REPAIR OF? REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  4. INSPECT FRONT NO.1 SPEAKER ASSY 
    1. Preparation for Check
      1. Disconnect the connector of the speaker.
    2. Resistance Check
    1. Check the resistance between the terminals of the speaker.
      NOTE: The speaker should not be removed for checking.

      Standard value: 4 Ω 

    1. NG: REPLACE FRONT NO.1 SPEAKER ASSY 
    2. OK: GO TO NEXT STEP. 
  5. INSPECT FRONT NO.2 SPEAKER ASSY 
    1. Check that malfunction disappear when a known good speaker is installed.

      Standard: malfunction disappear. 

    HINT:

    Connect the all connectors of speakers.

    1. NG: REPLACE FRONT NO.2 SPEAKER ASSY 
    2. OK: GO TO NEXT STEP. 
  6. INSPECT REAR SPEAKER ASSY 
    1. Preparation for Check
      1. Disconnect the connector of the speaker.
    2. Resistance Check
      1. Check the resistance between the terminals of the speaker.
      NOTE: The speaker should not be removed for checking.

      Standard value: 6 Ω 

      1. NG: REPLACE REAR SPEAKER ASSY 
      2. OK: GO TO NEXT STEP. 
    3. INSPECT RADIO RECEIVER ASSY (+B, ACC, GND) 
    1. Check that the continuity between terminals at each condition, as shown in the chart.

      Standard: 

      RADIO RECEIVER ASSY CONNECTOR TERMINAL CONTINUITY

      Tester connection Condition Specified condition
      GND-Body ground Constant Continuity
      Fig 1: Identifying Radio Receiver Assy Connector Terminals +B, ACC And GND
      G02861009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the voltage between terminals at each condition, as shown in the chart.

      Standard: 

      RADIO RECEIVER ASSY CONNECTOR TERMINAL VOLTAGE

      Tester connection Condition Specified condition
      +B-GND Constant 10-14 V
      ACC-GND Ignition switch ACC or ON 10-14V
    1. OK: CHECK AND REPLACE RADIO RECEIVER ASSY 
    2. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
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