Radio Receiver Power Source Circuit [11/2017 - ]: Procedure

1. Disconnect the O144 and O143 radio receiver assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O143-1 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O143-4 (+B1) - O143-1 (GND1)	Always	11 to 14 V
   O143-15 (ACC1) - O143-1 (GND1)	Engine switch on (ACC)	11 to 14 V
   O144-19 (IG) - O143-1 (GND1)	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2017 - 10/2018]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2018 - 11/2019]  , or refer to  PROBLEM SYMPTOMS TABLE [11/2019 - 10/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR