Inspection Procedure

1. Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.
2. Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

3. Measure the resistance between each of the front No. 2 speakers (except the center speaker) and the front stereo component speaker to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

4. Measure the resistance between each of the front stereo component speakers and the stereo component amplifier to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

5. with Front Center Speaker:

   Measure the resistance between the front No. 2 speaker (center speaker) and the stereo component amplifier to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

6. Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

   Fig 1: Identifying Stereo Component Amplifier And Speakers Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.

   Standard resistance: 10 kΩ or higher 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Front Stereo Component Speakers And Front No.2 Speaker Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO next step. 

1. Resistance check
   1. Measure the resistance between the terminals of the speaker.

      Standard resistance: 

      with Front Center Speaker: 7 to 9 Ω 

      without Front Center Speaker: Approximately 2 Ω 

      HINT:

      Perform the above inspection on both LH and RH sides.

NG: REPLACE FRONT NO. 1 SPEAKER 

OK: GO TO next step. 

1. Resistance check
   1. Measure the resistance between the terminals of the speaker.

      Standard resistance: 

      with Front Center Speaker: 7 to 9 Ω 

      without Front Center Speaker: Approximately 4 Ω 

      HINT:

      Perform the above inspection on both LH and RH sides.

NG: REPLACE FRONT NO. 2 SPEAKER 

OK: GO TO next step. 

1. Check that the malfunction disappears when another speaker in good condition is installed.

   Standard: Malfunction disappears. 

   HINT:

   • Connect all the connectors to the front stereo component speakers.
   • When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
   • Perform the above inspection on both LH and RH sides.

OK: REPLACE FRONT STEREO COMPONENT SPEAKER 

NG: GO TO next step. 

1. Resistance check
   1. Measure the resistance between the terminals of the speakers.

      Standard resistance: 

      with Front Center Speaker: 14 to 18 Ω 

      without Front Center Speaker: Approximately 4 Ω 

      HINT:

      Perform the above inspection on both LH and RH sides.

NG: REPLACE REAR SPEAKER 

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