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Component Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Relay Testing

  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 of resistance between the relay switch side.
    • If greater than 2 ohms, replace the relay.
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