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Engine hood switch

Engine hood switch

Fault symptom

The alarm does not sound when the hood is opened and the alarm is armed.

Action


1. Check the function, open/closed hood

Connect the scan tool. Select "READ VALUES". Select "BONNET". Open/close the hood while checking the scan tool display. The scan tool should display "OPEN" or "CLOSED".

If the ISAT scan tool display is correct for open/closed hood, the fault is intermittent, proceed to point 5. If not, proceed to point 2.

2. Check the voltage, open/closed hood.

Unplug the connector to the hood switch. Turn the ignition key to the "ON" (+15) position. Repeat the scan tool commands as point 1. When the connector is open, the scan tool should show "OPEN". Loop between the connector, pin 1 and a safe grounding point. The ISAT scan tool should display "CLOSED".

If this is correct, proceed to point 3. If this is incorrect, proceed to point 4.

3. Check the hood switch

Select "BONNET". Connect jumper between both the pins in the connector. The ISAT scan tool should display "CLOSED".

If the scan tool shows "CLOSED", change the hood switch. If not, conduct a continuity test and take action between the hood switch connector, pin 2 and grounding point G33S.

4. Check the cable assembly to connector H33- 3

Conduct a continuity test on the cable assembly between connector H33-3, pin 28 and the hood switch, pin 1. The resistance should be < 1 Ohm.

If the resistance is incorrect, take action on the cable assembly. If the resistance is correct, proceed to point 6.

5. Check the cable assembly to the control module

Conduct a continuity test on the cable assembly between connector H33-3, pin 28 and the alarm control module, pin 16. The resistance should be < 1 Ohm.

If the resistance is incorrect, take action on the cable assembly. If the resistance is correct, proceed to point 5.

6. Final test

Check to see if the fault symptom remains. If the problem remains, proceed to .