Inspection Procedure

1. Disconnect the navigation ECU connector L16 and front No. 2 speaker connector D1.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Condition	Specified condition
   TWL + - AUO+	Always	Below 1 Ω
   TWL- - AUO-	Always	Below 1 Ω
   AUO+ - Body ground	Always	10 kΩ or higher
   AUO- - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Checking Harness And Connector (Navigation ECU - Front No. 2 Speaker)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 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.

OK : REPLACE FRONT NO. 2 SPEAKER 

NG: Go to Next Step 

1. Disconnect the front No. 1 speaker connector H3.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Condition	Specified condition
   D1-4 - H3-1	Always	Below 1 Ω
   D1-1 - H3-2	Always	Below 1 Ω
   D1-4 - Body ground	Always	10 kΩ or higher
   D1-1 - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Checking Harness And Connector (Front No. 1 Speaker - Front No. 2 Speaker)

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: 1.8 to 2.6 Ω 

NG: REPLACE FRONT NO. 1 SPEAKER 

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