Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Avalon. 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 or the radio receiver and speakers.
2. Measure the resistance between speakers or between a speaker and the stereo component amplifier or the radio receiver to check for an open circuit in the wire harness.
  Standard resistance: Below 1 Ω
  
  Fig 1: Disconnecting Stereo Component Amplifier And Radio Receiver Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance between body ground and the stereo component amplifier 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 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step
INSPECT FRONT NO. 1 SPEAKER
1. Resistance check
  1. Measure the resistance between the terminals of the speakers.
    Standard resistance:
    
    9 Speaker System: Approximately 4 Ω
    
    12 Speaker System: 1.8 to 2.6 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 speakers.
  - When there is a possibility that either the right or left front speaker is defective, inspect it by interchanging the right one with the left one.
OK : REPLACE FRONT NO. 2 SPEAKER

NG: Go to Next Step
INSPECT REAR SPEAKER
1. Resistance check
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance:
    
    9 Speaker System: 3.2 to 4.8 Ω
    
    12 Speaker System: 1.8 to 2.6 Ω
NG: REPLACE REAR SPEAKER

OK: Go to Next Step
INSPECT STEREO COMPONENT 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 speakers.
  - When there is a possibility that either the right or left front speaker is defective, inspect it by interchanging the right one with the left one.
OK : REPLACE STEREO COMPONENT SPEAKER

NG: Go to Next Step

INSPECT FRONT STEREO COMPONENT SPEAKER

Resistance check

Measure the resistance between the terminals of the front stereo component speaker.

Standard resistance

9 Speaker System

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
+ (E10-1) - - (E10-2)	Always	Approx. 40 Ω
+ (E10-3) - - (E10-4)	Always	Approx. 40 Ω

12 Speaker System

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E10-1 - E10-2	Always	1.5 to 2.1 Ω

NG: REPLACE FRONT STEREO COMPONENT SPEAKER

Fig 3: Identifying Front Stereo Component Speaker Connector Terminals

OK: Go to Next Step

INSPECT REAR NO. 2 SPEAKER
HINT:

If the vehicle is not equipped with a rear No. 2 speaker, proceed to the next step.
1. Resistance check
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance: 1.8 to 2.6 Ω
NG: REPLACE REAR NO. 2 SPEAKER

OK: Go to Next Step
INSPECT ROOF SPEAKER
HINT:

If the vehicle is not equipped with a roof speaker, proceed to the next step.
1. Resistance check
  1. Measure the resistance between the terminals of the speaker.
    Standard resistance: 1.5 to 2.1 Ω
NG: REPLACE ROOF SPEAKER

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