DCM Data Signal Circuit between Navigation ECU and DCM [08/2019 - ]: Procedure
- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))
- Disconnect the J157 DCM (Telematics Transceiver) connector.
- Disconnect the J149 radio receiver assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition J157-31 (USBG) - J149-11 (USBG) Always Below 1 Ω J157-17 (VOT+) - J149-13 (VOR+) Always Below 1 Ω J157-15 (USBV) - J149-10 (USBV) Always Below 1 Ω J157-17 (VOT-) - J149-14 (VOR-) Always Below 1 Ω J157-34 (VOR-) - J149-16 (VOT-) Always Below 1 Ω J157-18 (VOR+) - J149-15 (VOT+) Always Below 1 Ω J157-31 (USBG) or J149-11 (USBG) - Body ground Always 10 kΩ or higher J157-17 (VOT+) or J149-13 (VOR+) - Body ground Always 10 kΩ or higher J157-15 (USBV) or J149-10 (USBV) - Body ground Always 10 kΩ or higher J157-17 (VOT-) or J149-14 (VOR-) - Body ground Always 10 kΩ or higher J157-34 (VOR-) or J149-16 (VOT-) - Body ground Always 10 kΩ or higher J157-18 (VOR+) or J149-15 (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
- CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER))
- Disconnect the J157 DCM (Telematics Transceiver) connector.
*a Front view of wire harness connector
(to DCM (Telematics Transceiver))*b Front view of wire harness connector
(to Navigation ECU) - Disconnect the J153 navigation ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition J157-1 (USB-) - J153-2 (USB-) Always Below 1 Ω J157-2 (USB+) - J153-1 (USB+) Always Below 1 Ω J157-3 (USBS) - J153-3(USBS) Always Below 1 Ω J157-1 (USB-) or J153-2 (USB-) - Body ground Always 10 kΩ or higher J157-2 (USB+) or J153-1 (USB+) - Body ground Always 10 kΩ or higher J157-3 (USBS) or J153-3 (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 [08/2019 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Disconnect the J157 DCM (Telematics Transceiver) connector.