Lexus NX: Interior Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the map light assembly and spot light assembly.
WIRING DIAGRAM
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. | PERFORM ACTIVE TEST USING TECHSTREAM (ILLUMINATED ENTRY SYSTEM) |
(a) Using the Techstream, perform the Active Test.
Click here .gif)
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Illuminated Entry System | Turns on the lights that are controlled by the illuminated entry system* | ON or OFF | Perform the Active Test with door switch in the map light assembly turned on. |
*: Refer to Description for the lights that are controlled by the illuminated entry system.
Body Electrical > Main Body > Active Test| Tester Display |
|---|
| Illuminated Entry System |
OK:
Map light and spot light comes on.
| 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. | INSPECT SPOT LIGHT ASSEMBLY |
(a) Remove the spot light assembly.
Click here
(b) Inspect the spot light assembly.
Click here
| NG | | REPLACE SPOT LIGHT ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - SPOT LIGHT ASSEMBLY) |
(a) Disconnect the T6 and T7 map light assembly connectors.
(b) Disconnect the T11 spot light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| T6-10 (RIFL) - T11-4 (CTY) | Always | Below 1 Ω |
| T7-10 (RLMP) - T11-5 (GND1) | Always | Below 1 Ω |
| T7-14 (RIFR) - T11-1 (B) | Always | Below 1 Ω |
| T6-10 (RIFL) or T11-4 (CTY) - Body ground | Always | 10 kΩ or higher |
| T7-10 (RLMP) or T11-5 (GND1) - Body ground | Always | 10 kΩ or higher |
| T7-14 (RIFR) or T11-1 (B) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
| (a) Remove the instrument panel junction block assembly. Click here |
|
(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-1 (ILE) - 4D-36 | Always | Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
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DISASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
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