DCM Data Signal Circuit between Navigation ECU and DCM [10/2019 - 07/2022]: Procedure

1. Disconnect the F126 DCM (telematics transceiver) connector.
2. Disconnect the F3 radio receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F126-31 (USBG) - F3-11 (USBG)	Always	Below 1 Ω
   F126-17 (VOT+) - F3-13 (VOR+)	Always	Below 1 Ω
   F126-15 (USBV) - F3-10 (USBV)	Always	Below 1 Ω
   F126-33 (VOT-) - F3-14 (VOR-)	Always	Below 1 Ω
   F126-34 (VOR-) - F3-16 (VOT-)	Always	Below 1 Ω
   F126-18 (VOR+) - F3-15 (VOT+)	Always	Below 1 Ω
   F126-31 (USBG) or F3-11 (USBG) - Body ground	Always	10 kΩ or higher
   F126-17 (VOT+) or F3-13 (VOR+) - Body ground	Always	10 kΩ or higher
   F126-15 (USBV) or F3-10 (USBV) - Body ground	Always	10 kΩ or higher
   F126-33 (VOT-) or F3-14 (VOR-) - Body ground	Always	10 kΩ or higher
   F126-34 (VOR-) or F3-16 (VOT-) - Body ground	Always	10 kΩ or higher
   F126-18 (VOR+) or F3-15 (VOT+) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   OK (w/o Navigation System)	A
   OK (w/ Navigation System)	B
   NG	C

Result: 

B 

See step  3

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

A 

See step  2

1. Disconnect the t4 DCM (telematics transceiver) connector.
2. Disconnect the t3 radio receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   t4-1 (USB-) - t3-2 (USB-)	Always	Below 1 Ω
   t4-2 (USB+) - t3-1 (USB+)	Always	Below 1 Ω
   t4-3 (USBS) - t3-3 (USBS)	Always	Below 1 Ω
   t4-1 (USB-) or t3-2 (USB-) - Body ground	Always	10 kΩ or higher
   t4-2 (USB+) or t3-1 (USB+) - Body ground	Always	10 kΩ or higher
   t4-3 (USBS) or t3-3 (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 [10/2019 - 07/2022]  

Result: 

NG 

REPLACE TELEPHONE ECU WIRE 

1. Disconnect the t4 DCM (telematics transceiver) connector.
2. Disconnect the t2 navigation ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   t4-1 (USB-) - t2-2 (USB-)	Always	Below 1 Ω
   t4-2 (USB+) - t2-1 (USB+)	Always	Below 1 Ω
   t4-3 (USBS) - t2-3 (USBS)	Always	Below 1 Ω
   t4-1 (USB-) or t2-2 (USB-) - Body ground	Always	10 kΩ or higher
   t4-2 (USB+) or t2-1 (USB+) - Body ground	Always	10 kΩ or higher
   t4-3 (USBS) or t2-3 (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 [10/2019 - 07/2022]  

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR