Lexus NX: Horn Circuit
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
Click here
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PROCEDURE
| 1. | CHECK HORNS OPERATION |
(a) Press the horn switch and check if the horns sound.
| Horns do not sound | .gif) | GO TO HORN SYSTEM |
|
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| 2. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4B-49 - A-28 (HORN) | Always | Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
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Theft Warning Siren Circuit
DESCRIPTION The theft warning siren has an internal battery. If the vehicle auxiliary battery cable is disconnected or any of the communication lines are open, the theft warning siren detects this and
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Removal
REMOVAL PROCEDURE 1. REMOVE CONSOLE ARMREST ASSEMBLY (for Front Side) Click here 2. REMOVE UPPER NO. 2 CONSOLE PANEL GARNISH (for Front Side) Click here 3. REMOVE DOOR SCUFF PLATE ASSEMBLY LH (for Front Side) Click here 4. REMOVE COWL SIDE TRIM BOARD LH (for Front Side) Click here
Initialization
INITIALIZATION INITIALIZE PANORAMIC VIEW MONITOR SYSTEM (a) When "!" mark is displayed on the multi-display assembly, correct the steering angle neutral point using the following method. (1) Fully turn the steering wheel to the left and right on flat ground. NOTICE: Memorizing the steering angle neu
