Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2015 >> Spark LS, Standard Trans >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Testing >> Rear Defogger Switch Malfunction

Rear Defogger Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module. Engine running.
  2. Test for greater than 7 V between the signal circuit terminal 2 and ground.
    • If 7 V or less 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If greater than 7 V 
  3. Replace the K33 HVAC Control Module.
scientia non olet · About Mike's Workshop Manuals