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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - DTC B0655 To DTC B3951 >> Diagnostic Information And Procedures >> DTC B3890: Trailer Backup Lamps Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF.
  2. Connect a test lamp between the control circuit terminal 2 (circuit 5189 GN/WH) at the X88 Trailer Connector and ground, ignition ON.
  3. Verify the test lamp turns ON and OFF when commanding the Trailer Backup Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the K101 Trailer Interface Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K101 Trailer Interface Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K101 Trailer Interface Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K101 Trailer Interface Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  4. Test or replace the X88 Trailer Connector.
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