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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647: Air Conditioning (A/C) Compressor Clutch Relay >> Component Testing

Component Testing

  1. Ignition OFF, disconnect the KR29 A/C Compressor Clutch Relay.
  2. Test for 60-180Ω between terminals 85 and 86.
    • If not between 60-180Ω 

      Replace the KR29 A/C Compressor Clutch Relay.

    • If between 60-180Ω 
  3. Test for infinite resistance between the terminals listed below:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR29 A/C Compressor Clutch Relay.

    • If infinite resistance 
  4. Install a 15A fused jumper wire between terminal 86 and 12V. Install a jumper wire between terminal 85 and ground.
  5. Test for less than 2Ω between terminals 30 and 87.
    • If 2Ω or greater 

      Replace the KR29 A/C Compressor Clutch Relay.

    • If less than 2Ω 
  6. All OK.
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