Inspection Procedure

1. Disconnect the navigation ECU connector L16 and front No. 2 speaker connector D1.
Fig 1: Identifying Navigation ECU Connector L16 And Front No. 2 Speaker Connector D1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   NAVIGATION ECU - FRONT NO. 2 SPEAKER
   
   

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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 

   FRONT NO. 1 SPEAKER - FRONT NO. 2 SPEAKER
   
   

   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 Ω or higher
   D1-1 - Body ground	Always	10 Ω or higher

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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