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Test B: Alarm System Does Not Operate Correctly

  1. Ensure all doors, luggage compartment and hood are closed. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Perform Generic Electronic Module (GEM) self-test. If all inputs respond correctly, go to next step. If alarm system does operate correctly when hood is opened, go to step  3. If alarm system horns do not sound, go to step  5. If turn signal lights do not flash, go to step  6. If there is no response from remote keyless entry transmitter, see POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS article. If door key set/reset switch does not operate correctly, go to step  8. If door courtesy light switch does not operate correctly, go to step  13. If luggage compartment set/reset switch does not operate correctly, go to step  14. If luggage compartment courtesy light switch does not operate correctly, go to step  16.
  2. Turn ignition off. Disconnect hood switch connector C897. Measure resistance between hood switch connector C897 terminals No. 1 and 2 (component side). Resistance should be 5 ohms or less with plunger released, and greater than 10 k/ohms with plunger depressed. If resistance is as specified, go to next step. If resistance is not as specified, replace hood switch. See PIN SWITCHES  under REMOVAL & INSTALLATION. Retest system operation.
  3. Turn ignition off. Disconnect GEM connector C103. Measure resistance between GEM connector C103 terminal No. 21 (Black/Yellow wire) and ground. See Figure. Resistance should be 5 ohms or less when hood is closed and greater than 10 k/ohms when hood is open. If resistance is as specified, replace GEM. See GENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If resistance is not as specified, go to next step.
  4. Measure resistance between hood switch connector C897 terminal No. 1 (Black wire) and ground. If resistance is 5 ohms or less, replace GEM. See GENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open in Black wire between hood switch and ground. Retest system operation.
  5. Disconnect anti-theft horn connector C982, located in left side of luggage compartment. Measure resistance between anti-theft horn harness connector C982 and ground. If resistance is 5 ohms or less, repair short to ground in Orange/Green wire. Retest system operation. If resistance is greater than 5 ohms, clean and tighten anti-theft horn mounting. If concern persists, replace anti-theft horn. See ANTI-THEFT HORN  under REMOVAL & INSTALLATION. Retest system operation.
  6. Operate hazard flashers. If hazards operate properly, go to next step. If hazards do not operate properly, repair hazards as necessary. See EXTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  7. Turn ignition off. Disconnect GEM connector C104. Disconnect hazard switch connector C458. Measure resistance in Black/Orange wire between GEM connector C104 terminal No. 23 and hazard switch connector C458 terminal No. 4. See Figure and Fig 1 . If resistance is 5 ohms or less, replace GEM. See GENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open in Black/Orange wire. Retest system operation.
  8. Operate door locks using door lock switches and with key. If door locks operate properly, go to next step. If door locks do not operate properly, repair door locks as necessary. See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - FOCUS article.
  9. Turn ignition off. Disconnect GEM connector C101. Measure resistance between GEM connector C101 terminal No. 19 (Black/Orange wire) and ground. See Figure. Lock and unlock door using key in appropriate door lock cylinder. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step  11.
  10. Measure resistance between GEM connector C102 terminal No. 16 (Black/Green wire) and ground. Lock and unlock door using key in appropriate door lock cylinder. If resistance is 5 ohms or less, replace GEM. SeeGENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If resistance is not 5 ohms or less, go to step  12
  11. Disconnect inoperative door lock motor connector. Measure resistance between GEM connector C101 terminal No. 19 (Black/Orange wire) and ground. Resistance should be greater than 10 k/ohms. Measure resistance in Black/Orange wire between GEM connector C101 terminal No. 19 and door lock motor connector terminal No. 8. See Figure and Fig 2 . Resistance should be 5 ohms or less. If resistances are as specified, replace door lock motor. See DOOR LATCH under REMOVAL & INSTALLATION in POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS article. If resistances are not as specified, repair open or short to ground in Black/Orange wire. Retest system operation.
  12. Disconnect inoperative door lock motor connector. Measure resistance between GEM connector C102 terminal No. 16 (Black/Green wire) and ground. Resistance should be greater than 10 k/ohms. Measure resistance in Black/Green wire between GEM connector C102 terminal No. 16 and door lock motor connector terminal No. 4. See Figure and Fig 2 . Resistance should be 5 ohms or less. If resistances are as specified, replace door lock motor. See DOOR LATCH under REMOVAL & INSTALLATION in POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS article. If resistances are not as specified, repair open or short to ground in Black/Green wire. Retest system operation.
  13. Place interior light switch to light on with door open position. Open door that does not trigger alarm. If interior lights operate properly, replace GEM. SeeGENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If interior lights do not operate properly, repair as necessary. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  14. Ensure ignition is off. Disconnect luggage compartment anti-theft inhibit switch connector (C632 on Wagon, C800 on all others). Measure resistance between luggage compartment anti-theft inhibit switch connector Black wire terminal (No. 1 on Wagon, No. 3 on all others) and ground. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Black wire. Retest system operation.
  15. Measure resistance between luggage compartment anti-theft inhibit switch terminals (C632 terminals No. 1 and 2 on Wagon, C800 terminal No. 2 and 3 on all others). Resistance should be 5 ohms or less with luggage compartment anti-theft inhibit switch closed (key turned to unlock position), and greater than 10 k/ohms with luggage compartment anti-theft inhibit switch open (key not turned to unlock position). If resistance is as specified, repair open in Black/Orange wire between luggage compartment anti-theft inhibit switch and GEM. See WIRING DIAGRAMS . If any resistance is not as specified, replace luggage compartment anti-theft inhibit switch. See PIN SWITCHES  under REMOVAL & INSTALLATION. Retest system operation.
  16. Place interior light switch to light on with door open position. Open luggage compartment lid. If interior lights operate properly, replace GEM. SeeGENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If interior lights do not operate properly, repair as necessary. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Fig 1: Identifying Hazard Switch Connector C458 Terminals
G00188411Courtesy of FORD MOTOR CO.
Fig 2: Identifying Door Lock Motor Connector Terminals
G00006272Courtesy of FORD MOTOR CO.
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