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
Click here .gif)
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.
Click here
| 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.
Click here
(b) Inspect the map light assembly.
Click here
| 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 |
READ NEXT:
Footwell Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the operation of the following lights:
No. 1 interior illumination light assembly LH
No. 1 interior illumination light assembly
Power Switch Illumination Circuit
DESCRIPTION The illuminated entry system controls the power switch illumination. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Recognition code registration is necessary when replacing the main b
Door Unlock Detection Switch Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Recognition code registration
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE REAR WHEEL Click here 2. DISCONNECT REAR SPEED SENSOR LH (a) w/o AVS: Click here (b) w/ AVS: Click here 3. REMOVE REAR SUSPENSION ARM
Fuel information
You must only use unleaded gasoline
in your vehicle.
Select octane rating 87 (Research
Octane Number 91) or higher. Use
of unleaded gasoline with an octane
rating lower than 87 may result in
engine knocking. Persistent knocking
can lead to engine damage.
At minimum, the gasoline you use
s
