Inspection Procedure

1. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   MUTE - Body ground	Turn ignition switch to ACC, Audio system is playing → Changing	Above 3.5 V → Below 1 V

Fig 1: Identifying Stereo Component Amplifier Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: Go to next step. 

1. Disconnect the navigation receiver assembly connector R15 and television display assembly connector S11.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   R15-7 (MUTE) - S11-1 (MUTE)	Always	Below 1 Ω
   MUTE - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Navigation Receiver Assembly Connector R15 Television Display Assembly Connector S11
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Replace the stereo component amplifier and check if it operates normally.

   OK: The navigation system operates normally. 

OK: NORMAL OPERATION 

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY