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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (HVAC System - Manual) >> Diagnostic Information and Procedures >> Auxiliary Blower Motor Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the auxiliary blower motor control module.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit and ground.
    • If greater than 1.0 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the battery positive voltage circuit and ground.
    • If less than B+, test the battery positive voltage circuit for a short to ground or an open/high resistance. If the REAR HVAC fuse is open, test battery positive voltage circuit for a short to ground.
  4. With a DMM, test for B+ between the B+ circuit terminal 6 and the control circuit terminal 3.
    • If less than B+, test the control circuit for and open/high resistance. If the circuit tests normal replace the HVAC control module.
  5. Test for 1.5-0.5 ohms of resistance between the low reference terminal 2 and supply voltage terminal 1.
    • If not within specified value, test and replace the auxiliary blower motor.
  6. If all circuits test normal, test and replace the auxiliary blower motor control module.
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