Inspection Procedure

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

   Standard resistance: Below 1 Ω 

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

   Standard resistance: Below 1 Ω 

5. Measure the resistance between the woofer box 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 the front No. 1 speaker and the front No. 2 speaker to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

7. Measure the resistance between the rear stereo component speaker and the stereo component amplifier to check for an open circuit in the wire harness.

   Standard resistance: Below 1 Ω 

8. 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 

Fig 1: Identifying Stereo Component Amplifier And Speakers Wire Harness Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Resistance check.
2. Measure the resistance according to the value(s) in the table below.
   NOTE: The speaker should not be removed for checking.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   1 - 3	Always	Approximately 1.2 Ω
   2 - 4	Always	Approximately 1.2 Ω

Fig 2: Identifying Woofer Box Speaker Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE WOOFER BOX SPEAKER 

OK: Go to next step. 

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

      Standard resistance: 4 to 6 Ω 

NG: REPLACE FRONT NO. 1 SPEAKER 

OK: Go to next step. 

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

   OK: Malfunction disappears. 

   HINT:

   • Connect all the connectors to the front No. 2 speakers.
   • When there is a possibility that either right or left front speaker is defective, inspect by interchanging the right one with the left one.

OK: REPLACE FRONT NO. 2 SPEAKER 

NG: Go to next step. 

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

      Standard resistance: Approximately 2.6 Ω 

NG: REPLACE REAR SPEAKER 

OK: Go to next step. 

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

      Standard resistance: 1.2 to 2.2 Ω 

NG: REPLACE FRONT STEREO COMPONENT SPEAKER 

OK: Go to next step. 

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

   OK: Malfunction disappears. 

   HINT:

   • Connect all the connectors to the rear stereo component speakers.
   • When there is a possibility that either right or left front speaker is defective, inspect by interchanging the right one with the left one.

OK: REPLACE REAR STEREO COMPONENT SPEAKER 

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