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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - DTC B0655 To DTC B3951 >> Diagnostic Information And Procedures >> DTC B1480: Battery Rundown Protection Circuit Short To Ground >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate component listed below.
    • A3L Sunshade - Left
    • A3R Sunshade - Right
    • E28 Center Console Compartment Lamp
    • E37B Dome/Reading Lamps - 2nd Row
    • E37C Dome/Reading Lamps - 3rd Row
    • E37EL Dome/Reading Lamps - Front Overhead Console Left
    • E37ER Dome/Reading Lamps - Front Overhead Console Right
    • E37H Dome/Reading Lamps - Left Roof Rail
    • E37J Dome/Reading Lamps - Right Roof Rail
    • P22A Video Display - 2nd Row
    • P22B Video Display - 3rd Row
  2. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • A3L Sunshade - Left terminal A
    • A3R Sunshade - Right terminal A
    • E28 Center Console Compartment Lamp - terminal 1
    • E37B Dome/Reading Lamps - 2nd Row terminal A (without U42)
    • E37C Dome/Reading Lamps - 3rd Row terminal A (without U42)
    • E37EL Dome/Reading Lamps - Front Overhead Console Left terminal 2
    • E37ER Dome/Reading Lamps - Front Overhead Console Right terminal 2
    • E37H Dome/Reading Lamps - Left Roof Rail terminal 2
    • E37J Dome/Reading Lamps - Right Roof Rail terminal 2
    • P22A Video Display - 2nd Row terminal 5
    • P22B Video Display - 3rd Row terminal 5
  3. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body 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 K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  4. Test or replace the appropriate courtesy lamp.
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