Toyota Yaris: Theft Deterrent System / 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 the Registration.
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PROCEDURE
| 1. | READ VALUE USING GTS (HOOD COURTESY SWITCH STATUS) |
(a) According to the display on the GTS, read the Data List.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Hood Courtesy Switch Status | Engine hood courtesy switch | Close or Open | Close: Engine hood closed Open: Engine hood open | - |
| Tester Display |
|---|
| Hood Courtesy Switch Status |
OK:
The indicator on the GTS switches between ON and OFF in accordance with the hood lock assembly (engine hood courtesy switch) status.
| OK |
 | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 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 A58 hood lock assembly (engine hood courtesy switch) connector.
(b) Disconnect the H4 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 |
|---|---|---|
| A58-1 (+) - H4-27 (HCTY) | Always | Below 1 Ω |
| A58-2 (E) - Body ground | Always | Below 1 Ω |
| A58-1 (+) or H4-27 (HCTY) - Other terminals and body ground | Always | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT 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) |
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...
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...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Problem Symptoms Table
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Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
