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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 309 (Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Ignition Mode Switch Indicator Malfunction >> Component Testing

Component 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/Vehicle OFF, disconnect the harness at the S38 Ignition Mode Switch.
  2. Connect a jumper wire between the S38 Ignition Mode Switch terminal 4 and ground.
  3. Connect a 3 A fused jumper wire between the S38 Ignition Mode Switch terminal 5 and B+.
  4. Verify the green LED illuminates.
    • If the LED does not illuminate 

      Replace the S38 Ignition Mode Switch.

    • If the LED illuminates 
  5. Connect a 3 A fused jumper wire between the S38 Ignition Mode Switch terminal 2 and B+.
  6. Verify the amber LED illuminates.
    • If the LED does not illuminate 

      Replace the S38 Ignition Mode Switch.

    • If the LED illuminates 
  7. All OK.
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