Sound cannot be Heard Sound Quality is Poor only when Replaying USB Storage Device or "iPod" [10/2022 - ]: Procedure

1. Disconnect the H120 radio and display receiver assembly connector.
2. Disconnect the H130 No. 1 stereo jack adapter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H120-2 (US1-) - H130-2 (UDO-)	Always	Below 1 Ω
   H120-3 (US1+) - H130-3 (UDO+)	Always	Below 1 Ω
   H120-5 (USG1) - H130-5 (UJSS)	Always	Below 1 Ω
   H120-2 (US1-) or H130-2 (UDO-) - Body ground	Always	10 kΩ or higher
   H120-3 (US1+) or H130-3 (UDO+) - Body ground	Always	10 kΩ or higher
   H120-5 (USG1) or H130-5 (UJSS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Replace the No. 1 stereo jack adapter assembly with a new or known good one.

   Refer to REMOVAL [10/2022 - ]

2. Check if the problem symptom recurs.

   Result

   Result	Proceed to
   Malfunction disappears	A
   Malfunction occurs	B

Result: 

A 

END (NO. 1 STEREO JACK ADAPTER ASSEMBLY MALFUNCTION) 

Result: 

B 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]