Lexus ES: DCM Data Signal Circuit between Navigation ECU and DCM
DESCRIPTION
This circuit is used to send and receive signals between the DCM (Telematics Transceiver), radio receiver assembly and navigation ECU.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) |
(a) Disconnect the G128 DCM (Telematics Transceiver) connector.
(b) Disconnect the G1 radio receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G128-31 (USBG) - G1-11 (USBG) | Always | Below 1 Ω |
| G128-17 (VOT+) - G1-13 (VOR+) | Always | Below 1 Ω |
| G128-15 (USBV) - G1-10 (USBV) | Always | Below 1 Ω |
| G128-33 (VOT-) - G1-14 (VOR-) | Always | Below 1 Ω |
| G128-34 (VOR-) - G1-16 (VOT-) | Always | Below 1 Ω |
| G128-18 (VOR+) - G1-15 (VOT+) | Always | Below 1 Ω |
| G128-31 (USBG) or G1-11 (USBG) - Body ground | Always | 10 kΩ or higher |
| G128-17 (VOT+) or G1-13 (VOR+) - Body ground | Always | 10 kΩ or higher |
| G128-15 (USBV) or G1-10 (USBV) - Body ground | Always | 10 kΩ or higher |
| G128-33 (VOT-) or G1-14 (VOR-) - Body ground | Always | 10 kΩ or higher |
| G128-34 (VOR-) or G1-16 (VOT-) - Body ground | Always | 10 kΩ or higher |
| G128-18 (VOR+) or G1-15 (VOT+) - Body ground | Always | 10 kΩ or higher |
| NG |  | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 2. | CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER)) |
| (a) Disconnect the G130 DCM (Telematics Transceiver) connector. |
|
(b) Disconnect the G108 navigation ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G130-1 (USB-) - G108-2 (USB-) | Always | Below 1 Ω |
| G130-2 (USB+) - G108-1 (USB+) | Always | Below 1 Ω |
| G130-3 (USBS) - G108-3 (USBS) | Always | Below 1 Ω |
| G130-1 (USB-) or G108-2 (USB-) - Body ground | Always | 10 kΩ or higher |
| G130-2 (USB+) or G108-1 (USB+) - Body ground | Always | 10 kΩ or higher |
| G130-3 (USBS) or G108-3 (USBS) - Body ground | Always | 10 kΩ or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the LEXUS ENFORM system.
*: Use the Techstream.
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