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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0381: Wait to Start Lamp >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, verify that the instrument panel cluster warning indicators are illuminated.
    • If the instrument panel cluster warning indicators are not illuminated, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the P16 instrument panel cluster.
  2. Ignition OFF, disconnect ECM X1 harness connector. Ignition ON, the Wait to Start Lamp should not illuminate.
    • If the Wait to Start Lamp is illuminated, test the Wait To Start Indicator Control circuit terminal X1 20 for a short to ground. If the circuit tests normal, replace the P16 instrument panel cluster.
  3. Ignition ON, connect a 3 A fused jumper wire between the Wait To Start Indicator Control circuit terminal X1 20 and ground. The Wait to Start Lamp should illuminate.
    • If the Wait to Start Lamp does not illuminate, test the Wait to Start Indicator Control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument panel cluster/bulb.
  4. If all circuits/connections test normal, replace the K20 engine control module.
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