DCM Data Signal Circuit between Navigation ECU and DCM [09/2020 - ]: Procedure

1. Disconnect the O173 DCM (telematics transceiver) connector.
2. Disconnect the O148 radio receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O173-31 (USBG) - O148-11 (USBG)	Always	Below 1 Ω
   O173-17 (VOT+) - O148-13 (VOR+)	Always	Below 1 Ω
   O173-15 (USBV) - O148-10 (USBV)	Always	Below 1 Ω
   O173-33 (VOT-) - O148-14 (VOR-)	Always	Below 1 Ω
   O173-34 (VOR-) - O148-16 (VOT-)	Always	Below 1 Ω
   O173-18 (VOR+) - O148-15 (VOT+)	Always	Below 1 Ω
   O173-31 (USBG) or O148-11 (USBG) - Body ground	Always	10 kΩ or higher
   O173-17 (VOT+) or O148-13 (VOR+) - Body ground	Always	10 kΩ or higher
   O173-15 (USBV) or O148-10 (USBV) - Body ground	Always	10 kΩ or higher
   O173-33 (VOT-) or O148-14 (VOR-) - Body ground	Always	10 kΩ or higher
   O173-34 (VOR-) or O148-16 (VOT-) - Body ground	Always	10 kΩ or higher
   O173-18 (VOR+) or O148-15 (VOT+) - 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. Disconnect the O179 DCM (telematics transceiver) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to DCM (Telematics Transceiver))
   *b	Front view of wire harness connector (to Navigation ECU)

2. Disconnect the O161 navigation ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O179-1 (USB-) - O161-2 (USB-)	Always	Below 1 Ω
   O179-2 (USB+) - O161-1 (USB+)	Always	Below 1 Ω
   O179-3 (USBS) - O161-3 (USBS)	Always	Below 1 Ω
   O179-1 (USB-) or O161-2 (USB-) - Body ground	Always	10 kΩ or higher
   O179-2 (USB+) or O161-1 (USB+) - Body ground	Always	10 kΩ or higher
   O179-3 (USBS) or O161-3 (USBS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2020 - ]  

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR