DCM Data Signal Circuit between Navigation ECU and DCM: Procedure
WARNING: This page is about a different car, the 2010 Lexus LS 460L and 2010 Lexus LS 460. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - DCM)
- Disconnect the L130 DCM (telematics transceiver) connector.
- Disconnect the L131 display and navigation module display connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition L130-1-1 (USB-) - L131-1-1 (USB-) Always Below 1 Ω L130-1-2 (USB+) - L131-1-2 (USB+) Always Below 1 Ω L130-1-3 (USBS) - L131-1-3 (USBS) Always Below 1 Ω L130-2 (USBG) - L131-2 (UGND) Always Below 1 Ω L130-3 (VOT+) - L131-7 (VOR+) Always Below 1 Ω L130-4 (USBV) - L131-4 (USBV) Always Below 1 Ω L130-5 (VOT-) - L131-6 (VOR-) Always Below 1 Ω L130-6 (VOR-) - L131-5 (VOT-) Always Below 1 Ω L130-7 (VOR+) - L131-3 (VOT+) Always Below 1 Ω L130-1-1 (USB-) - Body ground Always 10 kΩ or higher L130-1-2 (USB+) - Body ground Always 10 kΩ or higher L130-1-3 (USBS) - Body ground Always 10 kΩ or higher L130-2 (USBG) - Body ground Always 10 kΩ or higher L130-3 (VOT+) - Body ground Always 10 kΩ or higher L130-4 (USBV) - Body ground Always 10 kΩ or higher L130-5 (VOT-) - Body ground Always 10 kΩ or higher L130-6 (VOR-) - Body ground Always 10 kΩ or higher L130-7 (VOR+) - Body ground Always 10 kΩ or higher TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to DCM [Telematics Transceiver])*b Front view of wire harness connector
(to Display and Navigation Module Display)
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 2
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE