Inspection Procedure

1. Disconnect the navigation ECU connector M16 and front No. 2 speaker connector D1.
   Fig 1: Disconnecting Navigation ECU Connector M16 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 SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   TWL+ - AUO+	Always	Below 1
   TWL- - AUO-	Always	Below 1
   AUO+ - Body ground	Always	10 k or higher
   AUO- - Body ground	Always	10 k 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 I3.
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   D1-4 - I3-1	Always	Below 1
   D1-1 - I3-2	Always	Below 1
   D1-4 - Body ground	Always	10 k or higher
   D1-1 - Body ground	Always	10 k or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Disconnecting Front No. 1 Speaker Connector I3

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  

NG: REPLACE FRONT NO. 1 SPEAKER 

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