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Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Canyon and 2018 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the S70F Steering Wheel Controls Switch - Radio Volume and S70E Steering Wheel Controls Switch - Radio Presets. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminals listed below and ground.
    • S70F Steering Wheel Controls Switch - Radio Volume - ground circuit terminal 3
    • S70E Steering Wheel Controls Switch - Radio Presets - ground circuit terminal 3
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for greater than 4.5 V between the signal circuit terminals listed below and ground:
    • S70F Steering Wheel Controls Switch - Radio Volume - signal circuit terminal 1
    • S70F Steering Wheel Controls Switch - Radio Volume - signal circuit terminal 2
    • S70E Steering Wheel Controls Switch - Radio Presets - signal circuit terminal 1
    • S70E Steering Wheel Controls Switch - Radio Presets - signal circuit terminal 2
    • If 4.5 V or less 
    1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: 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, test or replace the S70R Steering Wheel Controls Switch - Right.
    • Go to next step: If greater than 4.5 V 
  5. Install a 3 A fused jumper wire between the signal circuit terminals listed below and ground.
    • S70F Steering Wheel Controls Switch - Radio Volume - signal circuit terminal 1
    • S70F Steering Wheel Controls Switch - Radio Volume - signal circuit terminal 2
    • S70E Steering Wheel Controls Switch - Radio Presets - signal circuit terminal 1
    • S70E Steering Wheel Controls Switch - Radio Presets - signal circuit terminal 2
  6. Verify the scan tool Steering Wheel Control Switches parameter changes.
    • If the Steering Wheel Control Switches parameter does not change 

      Test or replace the S70R Steering Wheel Controls Switch - Right.

    • Go to next step: If the Steering Wheel Control Switches parameter changes 
  7. Test or replace the appropriate S70F Steering Wheel Controls Switch - Radio Volume or S70E Steering Wheel Controls Switch - Radio Presets switch.
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