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When We Would Go To Start The Van And The Immobilizer Light Wouldn't Turn On/Flash
Only the immobilizer light doesn't come on, or none of the other indicator lights too (e.g. oil, etc.)
 

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A bad main relay could cause the computer to not test the immobilizer when the key is turned to ON.

Do you hear the fuel pump run for 2 seconds when you turn the ignition to ON and the immobilizer light is off?
 

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could this be that main relay?
If it's only the immobilizer and D4 lights that don't come on, yes.

If more than those two are out, it could be the ignition switch. It's a common failure on the 1999-2001 models.
 

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