Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR
1. Disconnect the connectors shown in Fig 1 from the stereo component amplifier assy and speakers.
2. Measure the resistance between the front No. 2 speaker assy and the stereo component amplifier assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
3. Measure the resistance between the rear speaker assy and the stereo component amplifier assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
  
  Fig 1: Checking Stereo Component Amplifier Assy Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the resistance between the stereo component speaker assy and the stereo component amplifier assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
5. Measure the resistance between the woofer box speaker assy No. 2 and the stereo component amplifier assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
  
  Fig 2: Front No. 2 Speaker Assy Stereo Component Speaker Assy Connector Front View
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Measure the resistance between the front No. 1 speaker assy and the front No. 2 speaker assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
7. Measure the resistance between the woofer box speaker assy No. 1 and the stereo component amplifier assy to check for an open circuit in the wire harness.
  Standard: Below 1 Ω
8. Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.
  Standard: 10 kΩ or higher
  
  Fig 3: Front No. 1 Speaker Assy Rear Speaker Assy Connector Front View
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Woofer Box Speaker Assy No. 2 Connector Front View
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Woofer Box Speaker Assy No. 1 Connector Front View
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP

INSPECT WOOFER BOX SPEAKER ASSY NO. 2

Resistance check.
1. Measure the resistance according to the value(s) in WOOFER BOX SPEAKER ASSY NO. 2 RESISTANCE .

NOTE: The speaker should not be removed for checking.

Standard:

WOOFER BOX SPEAKER ASSY NO. 2 RESISTANCE

Tester connection	Condition	Specified condition
1 - 3	Always	Approximately 1.21 Ω
2 - 4	Always	Approximately 1.21 Ω

Fig 6: Identifying Terminals Of Woofer Box Speaker Assy No. 2 Connector

NG: REPLACE WOOFER BOX SPEAKER ASSY NO. 2 (SEE W/BOX SPEAKER ASSY NO. 2 )
OK: GO TO NEXT STEP

INSPECT FRONT NO. 1 SPEAKER ASSY
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
  Standard: 4 to 6 Ω
1. NG: REPLACE FRONT NO. 1 SPEAKER ASSY
2. OK: GO TO NEXT STEP
INSPECT FRONT NO. 2 SPEAKER ASSY
1. Check that the malfunction disappears when another speaker in good condition is installed.
  OK: Malfunction disappears.
HINT:
- Connect all the connectors to the 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.
1. OK: REPLACE FRONT NO. 2 SPEAKER ASSY
2. NG: GO TO NEXT STEP
INSPECT REAR SPEAKER ASSY
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
Standard: Approximately 2.4 Ω
1. NG: REPLACE REAR SPEAKER ASSY
2. OK: GO TO NEXT STEP
INSPECT WOOFER BOX SPEAKER ASSY NO. 1
1. Check that the malfunction disappears when another speaker in good condition is installed.
  OK: Malfunction disappears.
HINT:
- Connect all the connectors to the speakers.
- When there is a possibility that either right or left rear speaker is defective, inspect by interchanging the right one with the left one.
1. OK: REPLACE WOOFER BOX SPEAKER ASSY NO. 1 (SEE W/BOX SPEAKER ASSY NO. 1 )
2. NG: GO TO NEXT STEP
INSPECT STEREO COMPONENT SPEAKER ASSY
1. Check that the malfunction disappears when another speaker in good condition is installed.
  OK: Malfunction disappears.
HINT:
- Connect all the connectors to the 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.
1. OK: REPLACE STEREO COMPONENT SPEAKER ASSY
2. NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE