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Home >> Suzuki >> 1987 >> Samurai Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Heater And Ventilation) >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647 >> Component Testing >> Relay Testing
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Relay Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the A/C Compressor Clutch Relay.
  2. Test for 137 ohms across the relay coil B+ and relay coil output controlled circuits.
    • If the resistance is not close to the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • relay switch B+ and the relay switch controlled output.
    • If less than infinite resistance, replace the relay
  4. Install a 20-amp fused jumper wire between relay coil B+ and 12 volts. Install a jumper wire between relay coil control and ground. Measure for less than 2 ohms of resistance between the relay switch B + circuit and relay switch controlled output circuit.
    • If greater than 2 ohms, replace the relay.
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