Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1997EXPLORER 4D UTILITY, 4.0 E, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 40 (MODULE COMMUNICATIONS NETWORK)TESTINGTEST B: REMOTE ANTI-THEFT PERSONALITY (RAP) MODULE DOES NOT RESPOND TO NGS TESTER
1997 Ford Explorer 4D Utility, 4.0 E, 4WD
Test B: Remote Anti-Theft Personality (Rap) Module Does Not Respond To NGS Tester
1997 Ford Explorer 4D Utility, 4.0 E, 4WDSECTION Test B: Remote Anti-Theft Personality (Rap) Module Does Not Respond To NGS Tester
WARNING: This page is about a different car, the 1997 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Disconnect RAP module Black 26-pin connector C256 located behind left side of instrument panel. See Fig 1 . Inspect connector C256 and Data Link Connector (DLC) C228 for physical damage, bent terminals or corrosion. Repair as necessary and retest system. If connectors are okay, go to next step.
- Measure resistance of Light Blue/White wire between RAP module connector C256, terminal No. 3 and DLC C228, terminal No. 7. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 4).
- Reconnect RAP module connector C256. Perform data link diagnostics. See DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS. If RAP module responds to NGS tester, system is functioning properly. If RAP module does not respond to NGS tester, replace RAP module and retest system.
- Disconnect and inspect both halves of in-line 16-pin Gray connector C247 located behind left side of instrument panel. See Fig 2 . Inspect connector for physical damage, bent terminals or corrosion. Repair as necessary and retest system. If connector is okay, go to next step.
- Measure resistance of Light Blue/White wire between RAP module connector C256, terminal No. 3 and in-line connector C247 (male half), terminal No. 16. See Fig 1 and Fig 2 . If resistance is less than 5 ohms, repair open in Light Blue/White wire between female half of in-line connector C247 and DLC C228. Retest system. If resistance is 5 ohms or more, repair open in Light Blue/White wire between RAP module connector C256 and male half of in-line connector C247. Retest system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.