Data Signal Circuit between Radio Receiver and Extension Module [08/2015 - 09/2019]: Procedure

1. Disconnect the R33 radio and display receiver assembly connector.
2. Disconnect the S53 stereo component tuner assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S53-1 (USV4) - R33-1 (USV4)	Always	Below 1 Ω
   S53-2 (US4-) - R33-2 (US4-)	Always	Below 1 Ω
   S53-3 (US4+) - R33-3 (US4+)	Always	Below 1 Ω
   S53-4 (UGO4) - R33-4 (UGO4)	Always	Below 1 Ω
   S53-5 (USG4) - R33-5 (USG4)	Always	Below 1 Ω
   S53-1 (USV4) - Body ground	Always	10 kΩ or higher
   S53-2 (US4-) - Body ground	Always	10 kΩ or higher
   S53-3 (US4+) - Body ground	Always	10 kΩ or higher
   S53-4 (UGO4) - Body ground	Always	10 kΩ or higher
   S53-5 (USG4) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of No. 1 navigation wire connector (to Radio and Display Receiver Assembly)
   *b	Front view of No. 1 navigation wire connector (to Stereo Component Tuner Assembly)

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 09/2018] , or refer to PROBLEM SYMPTOMS TABLE [09/2018 - 09/2019] )

Result: 

NG 

REPLACE NO. 1 NAVIGATION WIRE 

(Refer to REMOVAL [08/2015 - 09/2019] )