Lexus NX: DCM Data Signal Circuit between Navigation ECU and DCM
DESCRIPTION
This circuit is used to send and receive signals between the DCM (telematics transceiver) and radio receiver assembly.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - RADIO RECEIVER ASSEMBLY) |
(a) Disconnect the I153 radio receiver assembly connector.
(b) Disconnect the I183 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I153-10 (USBV) - I183-15 (USBV) | Always | Below 1 Ω |
| I153-11 (USBG) - I183-31 (USBG) | Always | Below 1 Ω |
| I153-15 (VOT+) - I183-18 (VOR+) | Always | Below 1 Ω |
| I153-16 (VOT-) - I183-34 (VOR-) | Always | Below 1 Ω |
| I153-13 (VOR+) - I183-17 (VOT+) | Always | Below 1 Ω |
| I153-14 (VOR-) - I183-33 (VOT-) | Always | Below 1 Ω |
| I153-10 (USBV) - Body ground | Always | 10 kΩ or higher |
| I153-11 (USBG) - Body ground | Always | 10 kΩ or higher |
| I153-15 (VOT+) - Body ground | Always | 10 kΩ or higher |
| I153-16 (VOT-) - Body ground | Always | 10 kΩ or higher |
| I153-13 (VOR+) - Body ground | Always | 10 kΩ or higher |
| I153-14 (VOR-) - Body ground | Always | 10 kΩ or higher |
| I153-12 (SGND) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - NAVIGATION ECU) |
| (a) Disconnect the I176 navigation ECU connector. |
|
(b) Disconnect the I185 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I176-1 (USB+) - I185-2 (USB+) | Always | Below 1 Ω |
| I176-2 (USB-) - I185-1 (USB-) | Always | Below 1 Ω |
| I176-3 (USBS) - I185-3 (USBS) | Always | Below 1 Ω |
| I176-1 (USB+) - Body ground | Always | 10 kΩ or higher |
| I176-2 (USB-) - Body ground | Always | 10 kΩ or higher |
| I176-3 (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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