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Home >> Cadillac >> 2023 >> XT6 Luxury, 4WD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Secondary And Configurable Customer Controls >> Diagnostic Information and Procedures >> Steering Wheel Controls Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF/Vehicle 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/Vehicle 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/Vehicle in Service Mode.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/Vehicle 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/Vehicle OFF.
    2. Test for infinite resistance between the B+ circuit terminal 1 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. Ignition/Vehicle OFF, disconnect all LIN devices that share the same LIN serial data circuit.
  6. Ignition ON/Vehicle In Service Mode.
    7. NOTE:

    For accurate voltage reading, disconnect the battery charger prior to performing the following test step.

  7. Test for 3.5-12 V between the LIN serial data circuit terminal and ground.
    • If less than 3.5 V 
    1. Ignition/Vehicle OFF, disconnect the harness connectors at the P16 Instrument Cluster.
    2. Test for infinite resistance between the LIN serial data circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the LIN serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    4. Replace the P16 Instrument Cluster.
    • If greater than 12 V 
    1. Ignition/Vehicle OFF, disconnect the harness connectors at the P16 Instrument Cluster.
    2. Ignition ON/Vehicle In Service Mode.
    3. Test for less than 1 V between the LIN serial data circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • Go to next step: If less than 1 V
    4. Replace the P16 Instrument Cluster.
    • Go to next step: If between 3.5-12 V 
  8. Verify how many LIN devices are connected to this LIN circuit.
    • If there is only one LIN device 
    1. Ignition/Vehicle OFF, inspect both harness and component connectors for contamination, corrosion, and terminal tension.
    2. Reconnect the harness connectors at the LIN device. Verify all connectors/terminals are fully seated.
    3. Ignition ON/Vehicle In Service Mode.
    4. Verify the DTC is not set again.
      • If the DTC is set, replace the LIN device that is not communicating.
      • Go to next step: If the DTC is not set
    5. A fault is currently not present and may be an intermittent condition.
    • Go to next step: If there are two or more LIN devices 
  9. Ignition/Vehicle OFF, disconnect the harness connectors at the P16 Instrument Cluster.
  10. Reconnect the harness connectors at the first LIN device.
  11. Ignition ON/Vehicle In Service Mode.
  12. Test for 3.5-12 V between the LIN serial data circuit terminal at the P16 Instrument Cluster and ground.
    • If less than 3.5 V or greater than 12 V 

      Replace the LIN device that was just connected.

    • Go to next step: If between 3.5-12 V 
  13. Ignition/Vehicle OFF, reconnect the harness connectors at another LIN device.
  14. Ignition ON/Vehicle In Service Mode.
  15. Test for 3.5-12 V between the LIN serial data circuit terminal at the P16 Instrument Cluster and ground.
    • If less than 3.5 V or greater than 12 V 

      Replace the LIN device that was just connected.

    • Go to next step: If between 3.5-12 V 
  16. Repeat steps 13-15 for the remaining LIN devices until a faulty LIN device is identified. If there is no faulty LIN device, replace the S70R Steering Wheel Control Switch - Right.
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