Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. 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 the illustration from the stereo component amplifier and speakers.
2. Measure the resistance between the front center speaker 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 the front No. 2 speakers and stereo component amplifier to check for an open circuit in the wire harness.
  Standard resistance:
  
  Below 1 Ω
4. without Rear Header Speaker:
  Measure the resistance between the front No. 2 speakers and front No. 1 speakers to check for an open circuit in the wire harness.
  
  Standard resistance:
  
  Below 1 Ω
5. without Rear Header Speaker:
  Measure the resistance between the rear speakers and stereo component amplifier to check for an open circuit in the wire harness.
  
  Standard resistance:
  
  Below 1 Ω
6. with Rear Header Speaker:
  Measure the resistance between the rear No. 2 speakers and 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. with Rear Header Speaker:
  Measure the resistance between the rear No. 2 speakers and rear speakers to check for an open circuit in the wire harness.
  
  Standard resistance:
  
  Below 1 Ω
8. with Rear Header Speaker:
  Measure the resistance between the rear header speakers and stereo component amplifier to check for an open circuit in the wire harness.
  
  Standard resistance:
  
  Below 1 Ω
9. with Rear Header Speaker:
  Measure the resistance between the front No. 1 speakers and stereo component amplifier to check for an open circuit in the wire harness.
  
  Standard resistance:
  
  Below 1 Ω
10. Measure the resistance between the stereo component speaker and stereo component amplifier to check for an open circuit in the wire harness.
  Standard resistance:
  
  Below 1 Ω
Fig 2: Identifying Speakers Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CONFIRM MODEL

Result

RESULT CHART

Result	Proceed to
with Rear Header Speaker	A
without Rear Header Speaker	B

B: Go to step 10

A: Go to Next Step

INSPECT FRONT CENTER SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 8 Ω
NG: REPLACE FRONT CENTER SPEAKER

OK: Go to Next Step
INSPECT FRONT NO. 1 SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 8 Ω
NG: REPLACE FRONT NO. 1 SPEAKER

OK: Go to Next Step
INSPECT FRONT NO. 2 SPEAKER
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 speaker.
  - When there is a possibility that either the right or left front speaker is detective, inspect by interchanging the right one with the left one.
  - Perform the above inspection on both LH and RH sides.
NG: REPLACE FRONT NO. 2 SPEAKER

OK: Go to Next Step
INSPECT REAR SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 8 Ω
NG: REPLACE REAR SPEAKER

OK: Go to Next Step
INSPECT REAR NO. 2 SPEAKER
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 No. 2 speaker.
  - When there is a possibility that either the right or left rear speaker is detective, inspect by interchanging the right one with the left one.
  - Perform the above inspection on both LH and RH sides.
NG: REPLACE REAR NO. 2 SPEAKER

OK: Go to Next Step
INSPECT REAR HEADER SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 8 Ω
NG: REPLACE REAR HEADER SPEAKER

OK: Go to Next Step

INSPECT STEREO COMPONENT SPEAKER

Resistance check.

Measure the resistance between the terminals of the speaker.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
WF1+ - WF1-	Always	Approximately 8 Ω

Fig 3: Identifying Speaker Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STEREO COMPONENT SPEAKER

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

INSPECT FRONT CENTER SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 10 Ω
NG: REPLACE FRONT CENTER SPEAKER

OK: Go to Next Step
INSPECT FRONT NO. 1 SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 4 Ω
NG: REPLACE FRONT NO. 1 SPEAKER

OK: Go to Next Step
INSPECT FRONT NO. 2 SPEAKER
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 No. 2 speaker.
  - When there is a possibility that either the right or left front speaker is detective, inspect by interchanging the right one with the left one.
  - Perform the above inspection on both LH and RH sides.
NG: REPLACE FRONT NO. 2 SPEAKER

OK: Go to Next Step
INSPECT REAR SPEAKER
1. Resistance check.
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    Approximately 4 Ω
NG: REPLACE REAR SPEAKER

OK: Go to Next Step