Do the following test.
1. Turn ignition OFF.
2. Disconnect the blower motor resistor assembly.
3. Turn ignition ON with engine OFF.
4. Probe the LOW( 1) and MED (2) blower motor control circuits at the blower motor resistor assembly, with a test lamp that is connected to battery positive voltage. At the same time, place the blower motor switch in the appropriate speed position for the circuit being tested.
Does the test lamp illuminate on both the control circuits?
If yes, test both motor control circuit for a short to ground.
If no, test the applicable blower motor control circuit for an open or high resistance.
Wednesday, July 14th, 2010 AT 8:47 AM