DCM Data Signal Circuit between Navigation ECU and DCM [12/2017 - 10/2020]: Procedure

1. Disconnect the G53 radio receiver assembly connector.
2. Disconnect the GG3 antenna cord sub-assembly (I/P) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G53-10 (USBV) - GG3-5 (USBV)	Always	Below 1 Ω
   G53-11 (USBG) - GG3-3 (USBG)	Always	Below 1 Ω
   G53-15 (VOT+) - GG3-8 (VOR+)	Always	Below 1 Ω
   G53-16 (VOT-) - GG3-7 (VOR-)	Always	Below 1 Ω
   G53-13 (VOR+) - GG3-4 (VOT+)	Always	Below 1 Ω
   G53-14 (VOR-) - GG3-6 (VOT-)	Always	Below 1 Ω
   G53-12 (SGND) - GG3-1 (SG)	Always	Below 1 Ω
   G53-10 (USBV) - Body ground	Always	10 kΩ or higher
   G53-11 (USBG) - Body ground	Always	10 kΩ or higher
   G53-15 (VOT+) - Body ground	Always	10 kΩ or higher
   G53-16 (VOT-) - Body ground	Always	10 kΩ or higher
   G53-13 (VOR+) - Body ground	Always	10 kΩ or higher
   G53-14 (VOR-) - Body ground	Always	10 kΩ or higher
   G53-12 (SGND) - 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 antenna connector from the DCM (telematics transceiver).

   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 Wire Harness)

2. Disconnect the antenna connector from the wire harness.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G131-3 (USBV) - GG3-5 (USBV)	Always	Below 1 Ω
   G131-1 (USBG) - GG3-3 (USBG)	Always	Below 1 Ω
   G131-9 (VOR+) - GG3-8 (VOR+)	Always	Below 1 Ω
   G131-8 (VOR-) - GG3-7 (VOR-)	Always	Below 1 Ω
   G131-2 (VOT+) - GG3-4 (VOT+)	Always	Below 1 Ω
   G131-7 (VOT-) - GG3-6 (VOT-)	Always	Below 1 Ω
   G131-3 (USBV) - Body ground	Always	10 kΩ or higher
   G131-1 (USBG) - Body ground	Always	10 kΩ or higher
   G131-9 (VOR+) - Body ground	Always	10 kΩ or higher
   G131-8 (VOR-) - Body ground	Always	10 kΩ or higher
   G131-2 (VOT+) - Body ground	Always	10 kΩ or higher
   G131-7 (VOT-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ANTENNA CORD SUB-ASSEMBLY (I/P). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

OK 

See step  3

1. Disconnect the antenna connector from the DCM (telematics transceiver).

   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 antenna connector from the navigation ECU.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G131-5 (USB+) - G135-1 (USB+)	Always	Below 1 Ω
   G131-4 (USB-) - G135-2 (USB-)	Always	Below 1 Ω
   G131-6 (USBS) - G135-3 (USBS)	Always	Below 1 Ω
   G131-5 (USB+) - Body ground	Always	10 kΩ or higher
   G131-4 (USB-) - Body ground	Always	10 kΩ or higher
   G131-6 (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 [12/2017 - 10/2020] 

Result: 

NG 

REPLACE ANTENNA CORD SUB-ASSEMBLY (I/P). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]