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Test Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Listen for an audible click when the cooling fan 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the cooling fan 1 relay. The cool fan 1 fuse supplies power to the coil side of the cooling fan 1 relay.
  3. 4. Verifies that the PCM is providing ground to the cooling fan 1 relay.
  4. 5. Tests if ground is constantly being applied to the cooling fan 1 relay.
Fig 1: DTC P0480
G01703801Courtesy of GENERAL MOTORS CORP.
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