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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 340 (Steering Wheel And Steering Column) >> Diagnostic Information and Procedures >> Heated Steering Wheel Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the X85 Steering Wheel Air Bag Coil..
  2. Test for less than 10 Ω between the ground terminal 1 and ground.
    • 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.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ terminal 9 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
      • If 2 Ω or greater
    3. Verify the in-line fuse is OK and there is voltage at the fuse.
      • If the in-line fuse is blown, replace the K32 Steering Wheel Heating Control Module.
      • If the in-line fuse is OK, repair the open/high resistance in the circuit.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K32 Steering Wheel Heating Control Module.
    • If the test lamp illuminates 
  5. Ignition OFF, connect the X2 harness connector at the X85 Steering Wheel Air Bag Coil. Disconnect the in-line harness connector at the S70L Steering Wheel Controls Switch - Left. Ignition ON.
  6. Install a 3 A fused jumper wire between the indicator control circuit terminal 2 and ground.
  7. Verify the steering wheel heat indicator is illuminated.
    • If the steering wheel heat indicator does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Control Switch - Left.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Ignition ON.
    4. Test for B+ between the signal circuit terminal 7 and ground.
      • If B+, replace the S70L Steering Wheel Control Switch - Left.
      • If not B+
    5. Test for less than 2 Ω in the signal circuit terminal 7 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the S70R Steering Wheel Control Switch - Right.
    • If the steering wheel heat indicator illuminates 
  8. Replace the K32 Steering Wheel Heating Control Module.
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