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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.

All Controls Malfunction

  1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right. 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 terminal 6 and ground.
    • If greater than 10 Ω 
    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. Verify that a test lamp illuminates between the B+ circuit terminal 7 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit terminal 7 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S70R Steering Wheel Controls Switch - Right.
    • Go to next step: If the test lamp illuminates 
  5. Test for 2 - 10 V between the serial data circuit terminal 5 and ground.
    • If less than 2 V 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
    2. Test for infinite resistance between the serial data 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 serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 Instrument Cluster.
    • If greater than 10 V 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
    2. Test for less than 1 V between the serial data circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P16 Instrument Cluster.
      • Go to next step: If between 2 - 10 V 
  6. Test or replace S70R Steering Wheel Controls Switch - Right

Left Controls Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  2. Test for less than 10 Ω between the ground circuit terminal 10 and ground.
    • If greater than 10 Ω 
    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. Test for 4.8 - 5.2 V between the volt between the following signal circuits and ground
    • Voice - Terminal 1
    • Mute - Terminal 3
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
    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, replace the P16 Instrument Cluster.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition 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 P16 Instrument Cluster.
      • Go to next step: If between 4.8 - 5.2 V 
  4. Replace the S70L Steering Wheel Controls Switch - Left.
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