Lexus NX: Engine Hood Courtesy Switch Circuit
DESCRIPTION
The engine hood courtesy switch is installed together with the hood lock. 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:
If the main body ECU (multiplex network body ECU) is replaced, 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 power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) According to the display on the Techstream, read the Data List.
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 indicator on the Techstream switches between ON and OFF in accordance with the hood lock assembly (engine hood courtesy switch) status.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | CHECK HARNESS AND CONNECTOR (HOOD LOCK ASSEMBLY [ENGINE HOOD COURTESY SWITCH] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND) |
(a) Disconnect the A32 hood lock assembly (engine hood courtesy switch) connector.
(b) Disconnect the I48 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A32-2 (+) - I48-11 (HCTY) | Always | Below 1 Ω |
| A32-1 (E) - Body ground | Always | Below 1 Ω |
| A32-2 (+) - Body ground | Always | 10 kΩ or higher |
| I48-11 (HCTY) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH) |
(a) Remove the hood lock assembly (engine hood courtesy switch).
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(b) Inspect the hood lock assembly (engine hood courtesy switch).
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| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH) |
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