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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 B3881 Or B3882: Tail Lamp Circuit Short To Ground >> Circuit/System Testing

Circuit/System Testing

DTC B3881

  1. Ignition OFF, exterior lamps OFF, all doors closed, open and close drivers door, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • E5L Stop Lamp - Left (X88 with T89)
    • E42L Tail Lamp Assembly - Left (X75/Z88)
  2. Test for less than 15 Ω between the appropriate ground circuit terminal listed below and ground.
    • E5L Stop Lamp - Left socket terminal (X88 with T89)
    • E42L Tail Lamp Assembly - Left terminal 6 (X75/Z88)
    • If 15 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 15 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E5L Stop Lamp - Left socket terminal (X88 with T89)
    • E42L Tail Lamp Assembly - Left terminal 4 (X75/Z88)
  4. Verify the test lamp turns ON and OFF when commanding the Stop Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 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 X4 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 
  5. Test or replace the stop lamp - left.

DTC B3882

  1. Ignition OFF, exterior lamps OFF, all doors closed, open and close drivers door, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • E5R Stop Lamp - Right (X88 with T89)
    • E42R Tail Lamp Assembly - Right (X75/Z88)
  2. Test for less than 15 Ω between the appropriate ground circuit terminal listed below and ground.
    • E5R Stop Lamp - Right socket terminal (X88 with T89)
    • E42R Tail Lamp Assembly - Right terminal 6 (X75/Z88)
    • If 15 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 15 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E5R Stop Lamp - Right socket terminal (X88 with T89)
    • E42R Tail Lamp Assembly - Right terminal 4 (X75/Z88)
  4. Verify the test lamp turns ON and OFF when commanding the Stop Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 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 X4 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 
  5. Test or replace the stop lamp - right.
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