Lexus NX: Illumination Circuit
DESCRIPTION
Power is supplied to the radio receiver assembly and steering pad switch assembly when the light control switch is in the tail or head position.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
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PROCEDURE
| 1. | CHECK METER / GAUGE SYSTEM |
(a) Check if the rheostat function operates normally.
OK:
The rheostat function operates normally.
| NG | .gif) | GO TO METER / GAUGE SYSTEM |
|
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| 2. | CHECK LIGHTING SYSTEM (INT) |
(a) Check if the instrument panel illumination comes on normally.
OK:
The instrument panel illumination comes on normally.
| NG | | GO TO LIGHTING SYSTEM (INT) |
|
| 3. | CHECK ILLUMINATION |
(a) Check if the illumination for the steering pad switch assembly or radio receiver assembly comes on when the light control switch is turned to the head or tail position.
| Result | Proceed to |
|---|---|
| Illumination for steering pad switch assembly does not come on. | A |
| Illumination for radio receiver assembly does not come on. | B |
| B | | GO TO STEP 7 |
|
| 4. | CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) |
| (a) Disconnect the spiral cable sub-assembly connector. |
|
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I4-13 (IL+2) - Body ground | Power switch on (IG) Light control switch in the tail or head position | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly.
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(b) Inspect the steering pad switch assembly.
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| NG | | REPLACE STEERING PAD SWITCH ASSEMBLY |
|
| 6. | INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Remove the spiral cable sub-assembly.
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(b) Inspect the spiral cable sub-assembly.
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| OK | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NG | | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
| 7. | CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) |
| (a) Disconnect the radio receiver assembly connector. |
|
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I152-15 (ILL+) - Body ground | Power switch on (IG) Light control switch in tail or head position | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the I152 radio receiver assembly connector.
(b) Disconnect the I10 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I152-16 (ILL-) - I10-39 (ILL-) | Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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SEE MORE:
Data List / Active Test
DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of switches,
Inspection
INSPECTION PROCEDURE 1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (a) Inspect the light control switch. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition
*1: w/ Light Control Switch Off P
