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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1382 (Hybrid Cooling System) >> Diagnostic Information and Procedures >> DTC P0BC1 >> Component Testing >> Fan Relay Test

Fan Relay Test

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
    The High Voltage Disabling procedure will perform the following tasks:
    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Ignition OFF, disconnect the drive motor generator battery vent fan relay.
  3. Test for 85-110 Ω between terminals 1 and 2.
    • If not within the specified range, replace the relay.
  4. Test for infinite resistance between the following terminals:
    • 1 and 3
    • 1 and 4
    • 2 and 3
    • 3 and 4
    • If not the specified value, replace the relay.
  5. Install a 5 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground. Test for less than 2 Ω between terminals 3 and 4.
    • If greater than the specified range, replace the relay.
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