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Test N: No Communication With HEC Module

  1. On 2000 models, check fuse junction panel fuses No. 12 (15-amp), No. 19 (10-amp) and No. 4 (7.5-amp). On 2001 models, check fuse junction panel fuses No. 23 (15-amp) and No. 14 (10-amp). If fuses are okay, go to next step. If fuses are not okay, replace failed fuse(s). Retest system for normal operation. If fuse fails again, check for short-to-ground. Repair as needed. Restore vehicle, clear DTCs and retest system.
  2. On all models, turn ignition off. Disconnect HEC connector. Turn ignition switch to RUN position. Measure voltage between ground and HEC connector pins No. 7 (Red/White wire), No. 9 (Gray/Yellow wire) and No. 8 (Red/Light Green wire). If voltages are more than 10 volts, go to next step. If voltages are not more than 10 volts, repair circuit(s) in question. Restore vehicle, clear DTCs and retest system.
  3. Turn ignition off. Measure resistance between ground and HEC connector pins No. 3 (Black wire) and No. 10 (Black wire). If resistances are less than 5 ohms, check are restore any ground points. If resistances are 5 ohms or more, repair Black wire circuit in question. Restore vehicle, clear DTCs and retest system.
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