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Home › Cadillac › 2018 › CT6 Plug-In › Repair and Diagnosis › Electrical › Instrument Panel System Displays And Gauges › Diagnostic Information and Procedures › Speedometer and/or Odometer Malfunction › Circuit/System Testing

Circuit/System Testing

NOTE:
  • Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
  • If there are multiple modules not original to the vehicle and they are used or incorrectly configured service parts, SPS may not be able to proper read or recover the vehicle odometer value. Follow government rules and documentation (including vehicle identification) regarding inaccurate/unknown odometer values.

Correcting VIN mismatch: Instrument Cluster is Showing "----" (Dashes), odometer is still unlocked 

  1. Ignition ON/Vehicle in Service Mode.
  2. Verify the scan tool Odometer Status parameter is Unlocked.
    • If the reading is Locked 

      Refer to correcting VIN mismatch - odometer locked.

    • Go to next step: If the reading is Unlocked 
  3. Verify the scan tool BCM VIN parameter matches the vehicle's VIN placard.
    • If the VIN does not match 

      Reprogram the BCM, then proceed to Step 3.

    • Go to next step: If the VIN matches 
  4. Verify the scan tool Instrument Cluster Vehicle Identification Number (VIN) parameter matches the vehicle's VIN placard.
    • If the VIN does not match 

      Reprogram the instrument cluster. Then proceed with step 4.

    • Go to next step: If the VIN matches 
  5. Verify the instrument cluster is displaying the correct value.
    • If the instrument cluster is still displaying "----" (dashes) 

      Replace the P16 Instrument Cluster.

    • Go to next step: If the instrument cluster is displaying the correct value 
  6. All OK.

Correcting VIN mismatch: Instrument Cluster is Showing "----" (Dashes), odometer is locked 

  1. Ignition ON/Vehicle in Service Mode.
  2. Verify the scan tool Odometer Status parameter is Locked.
    • If the reading is Unlocked 

      Refer to Correcting VIN mismatch - odometer unlocked.

    • Go to next step: If the reading is Locked 
  3. Verify the scan tool Instrument Cluster Vehicle Identification Number (VIN) parameter matches the vehicle's VIN placard.
    • If the VIN does not match 

      Reprogram the Instrument Cluster. Then proceed with step 3.

    • Go to next step: If the VIN matches 
  4. Perform the BCM setup procedure in SPS.
  5. Verify the instrument cluster is displaying the correct value.
    • If the instrument cluster is still displaying "----" (dashes) 

      Replace the P16 Instrument Cluster.

    • Go to next step: If instrument cluster is displaying the correct value 
  6. All OK.
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