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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 761 (Lighting System) >> Diagnostic Information and Procedures >> DTC P1574 (ECMw/L61) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the stoplamp switch adjustment, refer to Stop Lamp Switch Adjustment , clear all DTCs, and operate the vehicle within the Conditions for Running the DTC.
    • If DTC P1574 resets as current, test the stop lamp switch signal circuit for a short to ground, short to voltage, or open.
  2. If circuits test OK, replace the ECM.
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