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Blower Motor Switch Circuit Test

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  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the harness connector at the R3 Blower Motor Resistor.
  3. Test for less than 10 Ω between each control circuit terminal listed below and ground with the blower switch in the appropriate position.
    • Blower speed 1 terminal 1
    • Blower speed 2 terminal 4
    • Blower speed 3 terminal 2
    • If 10 Ω or greater 
    1. Disconnect the harness connector at the S94 Blower Motor Switch.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S94 Blower Motor Switch.
    • If less than 10 Ω 
  4. Disconnect the harness connector at the M8 Blower Motor.
  5. Place the S94 Blower Motor Switch in the high speed position.
  6. Test for less than 10 Ω between the control circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S94 Blower Motor Switch.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S94 Blower Motor Switch.
    • If less than 10 Ω 
  7. Test or replace the R3 Blower Motor Resistor.
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