Lexus NX: Interior Light Switch Signal Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) detects the condition of the door switch and front dome light switch.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
- If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (DOME LIGHT DOOR SW, DOME LIGHT SW) |
(a) Using the Techstream, read the Data List.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Dome Light DOOR SW | Door switch signal | ON or OFF | ON: Door switch on OFF: Door switch off | - |
| Dome Light SW | Front dome light switch signal | ON or OFF | ON: Front dome light switch on OFF: Front dome light switch off | - |
| Tester Display |
|---|
| Dome Light DOOR SW |
| Dome Light SW |
OK:
Normal conditions listed above are displayed.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly.
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(b) Inspect the map light assembly.
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| NG | | REPLACE MAP LIGHT ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU) |
(a) Disconnect the T6 and T7 map light assembly connectors.
(b) Disconnect the I47 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| T7-18 (DOOR) - I47-27 (DMDR) | Always | Below 1 Ω |
| T7-19 (CILL) - I47-28 (DMON) | Always | Below 1 Ω |
| T7-20 (GND9) - Body ground | Always | 10 kΩ or higher |
| T7-18 (DOOR) or I47-27 (DMDR) - Body ground | Always | 10 kΩ or higher |
| T7-19 (CILL) or I47-28 (DMON) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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SEE MORE:
Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for RHD and LHD vehicles.
The procedures listed below are for LHD vehicles.
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