Data Signal Circuit between Navigation Receiver Assembly and Stereo Jack Adapter [08/2016 - ]: Procedure

1. Disconnect the H177 radio receiver assembly connector.
2. Disconnect the H178 No. 1 stereo jack adapter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Radio Receiver Assembly)
   *b	Front view of wire harness connector (to No. 1 Stereo Jack Adapter Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H177-2 (US1-) - H178-2 (US1-)	Always	Below 1 Ω
   H177-3 (US1+) - H178-3 (US1+)	Always	Below 1 Ω
   H177-5 (USG1) - H178-5 (USG1)	Always	Below 1 Ω
   H177-2 (US1-) or H178-2 (US1-) - Body ground	Always	10 kΩ or higher
   H177-3 (US1+) or H178-3 (US1+) - Body ground	Always	10 kΩ or higher
   H177-5 (USG1) or H178-5 (USG1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2016 - ] 

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR