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Checking hood switch

Checking hood switch

Fault symptom

Alarm is not tripped when hood is opened and alarm is activated

Action


1. Connect ISAT and select "READ VALUES", then select "BONNET". Read off the ISAT display.

Open hood - "OPEN"

Closed hood - "CLOSED"

2. If not correct, connect BOB and measure resistance between the theft alarm connection pin 16 and a good grounding point.

Open hood - < 1 Ohm

Closed hood - OL

If the resistance is correct, proceed to step 6.

3. Check the wiring harness for open circuit/short-circuit by measuring resistance between the theft alarm connection pin 16 and connection 1 on the hood switch.

4. Also check the resistance between connection 2 on the hood switch and the battery negative terminal.

Resistance in step 3 and 4 must be < 1 Ohm.

5. Check the voltage between connection 2 and the battery negative terminal. The voltage must be 0 V.

6. If the resistance and voltage is correct in steps 4 and 5, the malfunction is likely in the switch, change switch and check the function.

7. If the malfunction remains despite the above checks, continue fault diagnosis on page .