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Test 5: No Communication With Gem

  1. Check fuse No. 1 (50-amp) in engine compartment fuse/relay box. If fuse is okay, go to next step. If fuse is faulty, replace fuse. Clear DTCs and retest system operation. If fuse fails again, check Tan/Black wire between engine compartment fuse/relay box and instrument panel fuse block for short to ground. See WIRING DIAGRAMS  . Repair circuit as necessary.
  2. Check fuse No. 25 (7.5-amp) in instrument panel fuse box. If fuse is okay, go to next step. If fuse is faulty, replace fuse. Clear DTCs and retest system operation. If fuse fails again, check White/Yellow wire between instrument panel fuse block and GEM for short to ground. Repair circuit as necessary.
  3. Measure voltage at input side of fuse No. 25 (7.5-amp) at instrument panel fuse box. If voltage is greater than 10 volts, install fuse and go to next step. If voltage is 10 volts or less, repair open in Tan/Black wire. Clear DTCs and retest system operation.
  4. Turn ignition switch to LOCK position. Disconnect GEM 18-pin harness connector (T-224). Measure voltage at terminal No. 11 (White/Yellow wire) at GEM harness connector. See Figure . If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open in White/Yellow wire between instrument panel fuse block and GEM. Clear DTCs and retest system operation.
  5. Disconnect GEM 26-pin harness connector (T-221). Measure resistance between ground and terminal No. 14 (Black/White wire) at GEM harness connector. See Figure . Measure resistance between ground and terminal No. 26 (Black/White wire) at GEM harness connector. If both resistance readings are 5 ohms or less, go to next step. If either resistance reading is greater than 5 ohms, repair open in appropriate Black/White wire(s). Clear DTCs and retest system operation.
  6. Disconnect GEM 18-pin harness connector (T-224). Measure resistance between ground and terminal No. 18 (Light Green/Black wire) at GEM harness connector. See Figure . If resistance is less than 5 ohms, replace GEM. If resistance is 5 ohms or greater, repair open in Light Green/Black wire. After repair, clear DTCs and retest system operation.
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