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Circuit/System Testing

NOTE: Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
  1. Vehicle OFF, disconnect the harness connector at the S126 Drive Mode Select Switch, vehicle ON.
  2. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Vehicle OFF, disconnect the harness connector at the A20 Radio/HVAC Controls.
    2. Test for infinite resistance between the signal 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 signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A20 Radio/HVAC Controls.
    • If greater than 5.2 V 
    1. Vehicle OFF, disconnect the harness connector at the A20 Radio/HVAC Controls, vehicle ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A20 Radio/HVAC Controls.
    • If between 4.8-5.2 V 
  3. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit

    • If less than 10 Ω 
  4. Replace the S126 Drive Mode Select Switch.
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