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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REMOVAL PROCEDURE 1. REMOVE BACK DOOR CENTER GARNISH Click here 2. REMOVE BACK DOOR SIDE GARNISH LH Click here 3. REMOVE BACK DOOR SIDE GARNISH RH Click here 4. REMOVE BACK DOOR TRIM BASE Click here 5. REMOVE PULL HANDLE Click here 6. REMOVE BACK DOOR LOCK COVER Click here 7. REMOV
