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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Secondary And Configurable Customer Control System >> Diagnostic Information and Procedures >> DTC B3622: Steering Wheel Controls >> Circuit/System Testing
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Circuit/System Testing

S70R Steering Wheel Controls Switch - Right Malfunction without UV6

  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.
    • 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 control 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.
    • 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.
      • 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.
      • If between 2 - 10 V 
  6. Test or replace S70R Steering Wheel Controls Switch - Right

S70R Steering Wheel Controls Switch - Right Malfunction with UV6

  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, 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.
    • 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 control 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.
    • If the test lamp illuminates 
  5. Ignition OFF, disconnect the harness connector at the P29 Head-Up Display, ignition ON.
  6. Test for 2 - 10 V between the S70R Steering Wheel Controls Switch - Right 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 S70R Steering Wheel Controls Switch - Right serial data circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the P29 Head-Up Display serial data circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω in the S70R Steering Wheel Controls Switch - Right 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 S70R Steering Wheel Controls Switch - Right serial data circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    3. Test for less than 1 V between the P29 Head-Up Display serial data circuit terminal 1 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.
      • If between 2 - 10 V 
  7. Connect the harness connector at the S70R Steering Wheel Controls Switch - Right. Ignition ON.
  8. Verify steering wheel controls function properly.
    • If steering wheel controls function properly 

      Replace P29 Head-Up Display.

    • If steering wheel controls do not function properly 
  9. Ignition OFF. Disconnect harness connector at the S70R Steering Wheel Controls Switch - Right. Connect the harness connector at the and P29 Head-Up Display. Ignition ON.
  10. Verify head-up display functions properly.
    • If head-up display functions properly 

      Replace S70R Steering Wheel Controls Switch - Right.

    • If head-up display does not function properly 
  11. Replace P16 Instrument Cluster.

S70L Steering Wheel Controls Switch - Left Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
  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.
    • If less than 10 Ω 
  3. Test for B+ between the following signal circuits and ground while pressing the appropriate Voice or Mute Button.
    • Voice - Terminal 1
    • Mute - Terminal 3
    • If less than B+ while pressing the appropriate Voice or Mute Button 
    1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
    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 S70L Steering Wheel Controls Switch - Left.
    • If B+ while pressing the appropriate Voice or Mute Button 
  4. Test for B+ in the signal circuit without pressing any buttons
    • If B+ without pressing any buttons 
    1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, 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 S70L Steering Wheel Controls Switch - Left.
    • If less B+ without pressing any buttons 
  5. Replace the S70R Steering Wheel Controls Switch - Right.
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