Join Date: May 2010
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With the Excursions, the PATS data is stored in the binary that operates the vehicle. When installing a TS Performance chip on an Excursion or F-series with PATS (from any vendor, so stop bashing the generic guys), if the PATS data is not read from the PCM and flashed to the chip (to EACH file on the chip), the "Theft" light will flash as you're experiencing. The PATS has simply been disabled in the tuning so the vehicle still starts.
To quell the issue, simply go underneath the dash and above the accelerator pedal position sensor you will see a black box with a 4-wire connector (it will be a green or red connector).....simply unplug that and your "Theft" light issues will be no more.
I'm not a jerk, I just tell it like it is.
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1995 SC/LB 4x4 PSD/Auto
2000 RC 2wd PSD/Auto