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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis >> Electrical >> Body Electrical >> Hybrid/EV System Controls >> Diagnostic Information and Procedures >> DTC P181C-P181F, P183A-P183F, P184A or P184B: Internal Mode Switch Circuit >> Circuit/System Verification
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Circuit/System Verification

  1. Vehicle ON.
  2. Verify the scan tool hybrid powertrain control module Internal Mode Switch 2 - D1, D2, R1, R2 and S parameters match those in the Internal Mode Switch 2 Parameters table below for each gear selector position. Record any discrepancies.
    • If any parameter shows an incorrect state 

      Refer to Circuit/System Testing.

    • If all parameters show correct states 
  3. All OK.
Internal Mode Switch 2 Parameters

Parameter Selector Position
Park Reverse Neutral Drive Manual
Internal Mode Switch 2 - D1 HIGH HIGH LOW LOW LOW
Internal Mode Switch 2 - D2 LOW LOW HIGH HIGH HIGH
Internal Mode Switch 2 - R1 HIGH LOW LOW HIGH HIGH
Internal Mode Switch 2 - R2 LOW HIGH HIGH LOW LOW
Internal Mode Switch 2 - S LOW HIGH LOW HIGH HIGH