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Test M: No Communication With Generic Electronic Module/Central Timer Module

NOTE: After all repairs, clear Diagnostic Trouble Codes (DTC) and recheck system operation. See WIRING DIAGRAMS  for circuit identification and repair.
  1. Check maxi-fuse No. 1 (60-amp) in Battery Junction Box (BJB), located in engine compartment near master cylinder. If fuse is okay, go to next step. If fuse is blown, replace fuse. If fuse blows again, check Tan/Black wire for short to ground.
  2. Check fuse No. 25 (7.5-amp) located in Central Junction Box (CJB), located under left side of instrument panel. If fuse is okay, go to next step. If fuse is blown, replace fuse. If fuse blows again, check White/Yellow wire for short to ground. Repair as necessary.
  3. Measure voltage between ground and supply side of CJB fuse No. 25 (7.5-amp). If more than 10 volts exist, go to next step. If volts or less exist, repair open in Tan/Black wire.
  4. Turn ignition switch to LOCK position. Disconnect Generic Electronic Module/Central Timer Module (GEM/CTM) 18-pin harness connector C283. GEM/CTM is located behind center of instrument panel finish panel. Measure voltage between ground and GEM/CTM harness connector C283 terminal No. 11 (White/Yellow wire). See Figure . If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in White/Yellow wire.
  5. Disconnect GEM/CTM 26-pin harness connector C280. Measure resistance between ground and GEM/CTM harness connector C280 terminal No. 14 (Black/White wire). See Figure . Measure resistance between ground and GEM/CTM harness connector C280 terminal No. 26 (Black/White wire). If resistance is 5 ohms or more in either measurement, repair open or high resistance in appropriate Black/White wire. If resistance is less than 5 ohms in both measurements, problem exists in module communications system. See MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article.
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