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Test U: No Communication With Gem/CTM

  1. Inspect fuse No. 25 (7.5-amp) in instrument panel fuse box. If fuse is okay, go to next step. If fuse is blown, replace fuse. Clear DTCs and retest system operation. If fuse fails again, repair short to ground in White/Yellow wire between fuse box and GEM.
  2. Measure voltage at input side of fuse No. 25. 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.
  3. 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 T-224. 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 box and GEM. Clear DTCs and retest system operation.
  4. Disconnect GEM 26-pin harness connector T-221. Measure resistance between ground and terminal No. 14 (Black/White wire) at GEM harness connector T-221. See Figure. Measure resistance between ground and terminal No. 26 (Black/White wire) at GEM harness connector T-221. If both resistance readings are is 5 ohms or less, go to next step. If either resistance reading is greater than 5 ohms, repair open in Black/White wire. Clear DTCs and retest system operation.
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