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Home >> Buick >> 2018 >> Regal GS >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures (B388B-P0504) And Symptoms >> Diagnostic Information and Procedures >> Sunshade Illumination Malfunction >> Circuit/System Testing

Circuit/System Testing

Sunshade Light Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate sunshade.
  2. Disconnect the negative terminal of the C1 Battery.
  3. Test for less than 5 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Reconnect the negative terminal to the C1 Battery.
  5. Ignition ON, test for greater than 11 V between the circuit terminal A and the ground circuit terminal B.
    • If less than the specified range, test the 12 V circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  6. If all circuits test normal, test or replace the A3L Sunshade - Left or A3R Sunshade - Right.
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