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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2585 or B3867: Left/Right Park Lamps Control >> Circuit/System Testing

Circuit/System Testing

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DTC B2585

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate left park/tail lamp.
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • E13LA Headlamp Assembly - Left terminal 4
    • E2LF Side Marker Lamp - Left Front terminal 1
    • E42L Tail Lamp Assembly - Left terminal 1
    • If 5 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.
    • If less than 5 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E13LA Headlamp Assembly - Left terminal 10 (MBI)
    • E13LA Headlamp Assembly - Left terminal 5 (-MBI)
    • E2LF Side Marker Lamp - Left Front terminal 2
    • E42L Tail Lamp Assembly - Left terminal 4
  4. Verify the test lamp turns ON and OFF when commanding the Left Park Lamps 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.
    • If the test lamp turns ON and OFF 
  5. Test or replace the appropriate left park lamp.

DTC B3867

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate right park/tail lamp.
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • E13RA Headlamp Assembly - Right terminal 4
    • E2RF Side Marker Lamp - Right Front terminal 1
    • E42R Tail Lamp Assembly - Right terminal 1
    • If 5 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.
    • If less than 5 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E13RA Headlamp Assembly - Right terminal 10 (MBI)
    • E13RA Headlamp Assembly - Right terminal 5 (-MBI)
    • E2RF Side Marker Lamp - Right Front terminal 2
    • E42R Tail Lamp Assembly - Right terminal 4
  4. Verify the test lamp turns ON and OFF when commanding the Right Park Lamps 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.
    • If the test lamp turns ON and OFF 
  5. Test or replace the appropriate right park lamp.
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