Question about 2004 GMC Savana

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When i connect the battery the fan comes on without the key being on

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Possible open in the ground lead. Repair the open ground to the fan.

Checking input battery power. While still jumped from step 1, use a test light or a multimeter and probe pins A or B (the terminal on the lower part of figure 4.) one at a time with the other lead to body ground. Do you see voltage?

The final step in electrical troubleshooting. Female radiator fan relay terminal:
when i connect the battery the fan comes on - relayfemale.gifFigure 6testlightz.gif
Figure 1.2 Basic Honda diagram with no timer.
Step 3e. Checking for a bad cooling system wiring and for bad components by using a process of elimination. First make sure you've tested the fan and it works. This is your final stage in troubleshooting for cars with a relay.

  1. Connect one end of the test light to the negative battery terminal. Unplug the relay and with a test light check terminal A, B, C, D one at a time at the car's relay port with the ignition OFF and ON. For example connect test light to port A and turn ignition on and off, then connect test light to port B and turn ignition on and off and so forth. At least one terminal should light up and turn off. If it does light up and turn off then eliminate this terminal as the potential fault.
  2. Turn off the ignition. Connect one end of the test light to the positive battery terminal. With a test light check terminal A, B, C, D one at a time while you jumped (short) and un-jump the thermoswitch terminals quickly. At least one terminal of A, B, C, D should blink. If it does then eliminate this terminal as the potential fault.
  3. Disconnect the fan connector. Connect one end of the test light to the positive battery terminal. With a test light probe pin K and L not at the fan side connector but the other one. At least one terminal should light. If it lights then go to the next step.
  4. For this test to work correctly, first fix step 3 if there is a problem. Connect the battery terminal. Connect one end of the test light to the positive battery terminal. With a test light check terminal A, B, C, D one at a time with the fan connector connected and unconnected. At least one terminal should blink. If it does then eliminate this terminal as the potential fault.
  5. With the information you've obtained, compare them to the chart below.
Thanks for contacting For Fixya

Posted on Jul 02, 2009


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