DCM Data Signal Circuit between Navigation ECU and DCM: Procedure
WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK NO. 1 NAVIGATION WIRE
- Disconnect the z11 DCM connector.
- Disconnect the z12 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 z11-1-1 (USB-) - z12-1-1 (USB-) Always Below 1 Ω z11-1-2 (USB+) - z12-1-2 (USB+) Always Below 1 Ω z11-1-3 (USBS) - z12-1-3 (USBS) Always Below 1 Ω z11-2 (USBG) - z12-2 (USBG) Always Below 1 Ω z11-3 (VOT+) - z12-7 (VOR+) Always Below 1 Ω z11-4 (USBV) - z12-4 (USBV) Always Below 1 Ω z11-5 (VOT-) - z12-6 (VOR-) Always Below 1 Ω z11-6 (VOR-) - z12-5 (VOT-) Always Below 1 Ω z11-7 (VOR+) - z12-3 (VOT+) Always Below 1 Ω z11-1-1 (USB-) - Body ground Always 10 kΩ or higher z11-1-2 (USB+) - Body ground Always 10 kΩ or higher z11-1-3 (USBS) - Body ground Always 10 kΩ or higher z11-2 (USBG) - Body ground Always 10 kΩ or higher z11-3 (VOT+) - Body ground Always 10 kΩ or higher z11-4 (USBV) - Body ground Always 10 kΩ or higher z11-5 (VOT-) - Body ground Always 10 kΩ or higher z11-6 (VOR-) - Body ground Always 10 kΩ or higher z11-7 (VOR+) - Body ground Always 10 kΩ or higher TEXT IN ILLUSTRATION*1 Front view of wire harness connector
(to DCM (Telematics Transceiver))*2 Front view of wire harness connector
(to Display and Navigation Module Display)
NG → REPLACE NO. 1 NAVIGATION WIRE
OK → See next step
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE