Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: 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 J157 DCM (Telematics Transceiver) connector.
(b) Disconnect the J149 radio receiver assembly connector.
(c) 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 |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER)) |
| (a) Disconnect the J157 DCM (Telematics Transceiver) connector. |
|
(b) Disconnect the J153 navigation ECU connector.
(c) 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 |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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