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Test A: No Communication With Generic Electronic Module

  1. Turn ignition switch to LOCK position. Disconnect Generic Electronic Module (GEM) 22-pin harness connector C201a. Turn ignition switch to RUN position. Measure voltage between ground and GEM harness connector C201a terminal No. 12 (Orange/Light Green wire). See Fig 1 . Measure voltage between ground and GEM harness connector C201a terminal No. 13 (Red/Yellow wire). If more than 10 volts exist in both measurements, go to next step. If 10 volts or less exist in either measurement, repair open in appropriate wire.
  2. Turn ignition switch to LOCK position. Disconnect GEM 26-pin harness connector C201b. Turn ignition switch to RUN position. Measure voltage between ground and GEM harness connector C201b terminal No. 26 (Black/White wire). See Fig 2 . If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in Black/White wire between GEM and Central Junction Box (CJB).
    Fig 1: Identifying Generic Electronic Module Harness Connector C201a Terminals
    G99A52118Courtesy of FORD MOTOR CO.
    Fig 2: Identifying Generic Electronic Module Harness Connector C201b Terminals
    G97A28803Courtesy of FORD MOTOR CO.
  3. Measure voltage between ground and GEM harness connector C201a terminal No. 1 (Black/Pink wire). If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in Black/Pink wire between GEM and CJB.
  4. Turn ignition switch to LOCK position. Measure resistance between ground and GEM harness connector C201b terminal No. 12 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance between GEM and ground. Ground point is located on floor, below left front seat.
  5. Turn ignition switch to LOCK position. Measure resistance between ground and GEM harness connector C201a terminal No. 2 (Black/White wire). If resistance is less than 5 ohms, repair module communication concern. See MODULE COMMUNICATIONS NETWORK - ESCAPE article. If resistance is 5 ohms or more, repair open or high resistance in Black/White wire between GEM and ground. Ground point is located behind lower center of dash panel.
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