WIS Document: 4030

| | Engine hood switch Fault symptom The alarm does not sound when the hood is opened and the alarm is armed. Diagnostic procedure 1 Check the operation of open/close bonnet | - | Connect the ISAT scan tool. | - | Select "READ VALUES". | - | Select "BONNET". | - | Open/close the bonnet, observing the ISAT scan tool display at the same time. The ISAT scan tool should display "OPEN" and "CLOSED" respectively. Is ISAT indicating open/close bonnet correctly? | yes The fault is of intermittent nature, proceed to point 5. | no Continue with point 2. 2 Check the current, bonnet open/closed | - | Unplug the connector from the bonnet switch. | - | Turn the ignition switch to the "ON" (+15) position. | - | Repeat the ISAT scan tool commands as in point 1. When the connector is open, the ISAT scan tool should display "OPEN". Connect a lead between pin 1 of the connector and a good grounding point. The ISAT scan tool should display "CLOSED". Is the function correct? | yes Continue with point 3. | no Continue with point 4. 3 Check the bonnet switch | - | Select "BONNET". | - | Connect jumper lead between the two connector pins. The ISAT scan tool should display "CLOSED". Is ISAT indicating "CLOSED"? | yes Change the bonnet switch. | no Check for continuity, and take remedial action if necessary, between pin 2 of the bonnet switch and grounding point G33S. 4 Check the wiring connected to connector H33-3 Check the wiring harness for continuity between pin 28 of connector H33-3 and pin 1 of the bonnet switch. The resistance should be < 1 ohm. Is the resistance correct? | yes Continue with point 6. | no Repair or replace the wiring harness. 5 Check the wiring connected to the electronic control module Check the wiring harness for continuity between pin 28 of connector H33-3 and pin 16 of the anti-theft alarm's electronic control module. The resistance should be < 1 ohm. Is the resistance correct? | yes Continue with point 5. | no Repair or replace the wiring harness. 6 Final check Check to see if the fault symptom remains. Is the problem still present? | yes See "Before replacing a control module". | no The remedial measures taken were correct or the fault is of intermittent nature.