Diesel Data: Automotive Repair

3. Hood Switch Input Circuit





OPERATION DESCRIPTION
When the hood is closed (the hood switch is switched OFF), HIGH-level signals are sent to the electronic control unit; when the hood is opened (the hood switch is switched ON), LOW-level signals are sent to the electronic control unit.





ELECTRONIC CONTROL UNIT TERMINAL VOLTAGE
Check connection status of the electronic control unit connector.





CHECKING THE HOOD SWITCH CIRCUIT
Disconnect the connector of the electronic control unit and check at the wiring harness side.