Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: 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 horns to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
.gif)
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | INSPECT HORNS |
(a) Press the horn switch and check if the horns sound.
| Result | Proceed to |
|---|---|
| Horns sound | A |
| Horns do not sound | B |
| B | .gif) | GO TO HORN SYSTEM |
|
.gif)
| 2. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the main body ECU (multiplex network body ECU).
Click here
| *a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
(b) Disconnect the 2C instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2C-27 - MB-28 (HORN) | Always | Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
Engine Hood Courtesy Switch Circuit
DESCRIPTION The engine hood courtesy switch is built into the hood lock assembly. This switch turns on when the engine hood is closed and turns off when the engine hood is opened. WIRING DIAGRAM CAUT ...
Security 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 security horn a ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Front Camera: Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are replaced during forward recognition camera removal/installation are shown below. Necessary Procedure After Parts Removed/Installed/Replaced Re ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Navigation System: GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device) (B1574)
DESCRIPTION The multi-display assembly and parking assist ECU are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. Detection Item DTC Detection Condition Trouble Area B1574 GVIF Disconnected (from Park Assist/Mo ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0171