Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (HOOD COURTESY SW) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Hood Courtesy SW | Engine hood courtesy switch | ON or OFF | ON: Engine hood open OFF: Engine hood closed | - |
| Tester Display |
|---|
| Hood Courtesy SW |
OK:
The Techstream display changes correctly in response to the engine hood courtesy switch (hood lock assembly) status.
| OK | .gif) | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
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| 2. | INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) |
(a) Remove the hood lock assembly.
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(b) Inspect the engine hood courtesy switch (hood lock assembly).
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| NG | | REPLACE ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) |
|
| 3. | CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) - BODY GROUND) |
(a) Disconnect the J8 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J8-11 (HCTY) - A11-1 | Always | Below 1 Ω |
| J8-11 (HCTY) or A11-1 - Body ground | Always | 10 kΩ or higher |
| A11-2 - Body ground | Always | Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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