Test H: Passive Anti-Theft System Module Does Not Respond To Scan Tool
WARNING: This page is about a different car, the 2002 Mercury Grand Marquis and 2002 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform all voltage and resistance tests using a Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
- Turn ignition switch to LOCK position. Disconnect Passive Anti-Theft System (PATS) module 16-pin harness connector C252. See Fig 1. PATS module harness connector C252 is located behind left side of dash panel. See Figure. Inspect harness connector for loose, damaged or corroded terminals. If connector and terminals are okay, go to next step. If connector and terminals are faulty, repair or replace as necessary. After repair, test system for normal operation.
- Connect PATS module harness connector C252. Connect Worldwide Diagnostic System (WDS) tester or New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located under instrument panel between steering column and radio. See Figure. Turn ignition switch to RUN position. Perform data link diagnostic procedure. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM. If WDS or NGS tester responds with PATS: NO RESPONSE ON CKT914 (BUS +), go to next step. If NGS tester does not respond with PATS: NO RESPONSE ON CKT914 (BUS +), go to step 4.
- Turn ignition switch to LOCK position. Disconnect WDS or NGS tester. Disconnect PATS module harness connector C252. Measure resistance between PATS module harness connector C252 terminal No. 6 and DLC terminal No. 2 (Tan/Orange wire). See Figure and Fig 1 . See WIRING DIAGRAMS . If resistance is 5 ohms or less, replace PATS module. See PASSIVE ANTI-THEFT SYSTEM MODULE under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open circuit in Tan/Orange wire between PATS module and DLC. After repair, test system for normal operation.
- Turn ignition switch to LOCK position. Disconnect WDS or NGS tester. Disconnect PATS module harness connector C252. Measure resistance between PATS module harness connector C252 terminal No. 5 and DLC terminal No. 10 (Pink/Light Blue wire). See Figure and Fig 1 . See WIRING DIAGRAMS . If resistance is 5 ohms or less, replace PATS module. See PASSIVE ANTI-THEFT SYSTEM MODULE under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open circuit in Pink/Light Blue wire between PATS module and DLC. After repair, clear DTCs and test system for normal operation.