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Home >> Saturn >> 2009 >> Vue Red Line, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1092 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P0645 >> Component Testing >> Relay Testing

Relay Testing

WARNING: This page is about a different car, the 2008 Saturn Outlook, 2008 GMC Acadia, and 2008 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the A/C Relay.
  2. Test for 137 ohms across the relay coil terminals.
    • If the resistance is not close to the specified range, replace the relay.
  3. Test for infinite resistance between switch side of the relay
    • If less than infinite resistance, replace the relay
  4. Install a 20-amp fused jumper wire between the relay coil side and 12 volts. Install a jumper wire between relay the coil side and ground. Measure for less than 2 ohms between the relay switch side.
    • If greater than 2 ohms, replace the relay.
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