Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2019TRAX PREMIER, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (LIGHTING SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURES)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2585 OR B3867CIRCUIT/SYSTEM TESTING

2019 Chevrolet Trax Premier, AWD

Circuit/System Testing

2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

DTC B2585

Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the appropriate park lamp.
Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
- E4J Park Lamp - Left Front socket terminal (Chevrolet with SBM)
- E13LA Headlamp Assembly - Left terminal 4 (Chevrolet with SBV)
- E13LA Headlamp Assembly - Left terminal 10 (Chevrolet)
- E13LA Headlamp Assembly - Left terminal 11 (Buick with SGM)
- E13LA Headlamp Assembly - Left terminal 8 (Buick with T4L)
- E42L Tail Lamp Assembly - Left terminal 5 (Chevrolet with UGE)
- E42L Tail Lamp Assembly - Left terminal 7 (Chevrolet with SBM)
- E42L Tail Lamp Assembly - Left terminal 3 (Buick with T4L)
- E42L Tail Lamp Assembly - Left terminal 3 (Buick with SGM)
- If 10 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 10 Ω
Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
- E4J Park Lamp - Left Front socket terminal (Chevrolet with SBM)
- E13LA Headlamp Assembly - Left terminal 7 (Chevrolet with SBV)
- E13LA Headlamp Assembly - Left terminal 9 (Chevrolet)
- E13LA Headlamp Assembly - Left terminal 10 (Buick with SGM)
- E13LA Headlamp Assembly - Left terminal 6 (Buick with T4L)
- E42L Tail Lamp Assembly - Left terminal 4 (Chevrolet with UGE)
- E42L Tail Lamp Assembly - Left terminal 3 (Chevrolet with SBM)
- E42L Tail Lamp Assembly - Left terminal 1 (Buick with T4L)
- E42L Tail Lamp Assembly - Left terminal 1 (Buick with SGM)
Verify the test lamp turns ON and OFF when commanding the Left Front Park 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.
  - Go to next step: 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
Test or replace the appropriate left park lamp.

DTC B3867

Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the appropriate park lamp.
Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
- E4K Park Lamp - Right Front socket terminal (Chevrolet with SBM)
- E13RA Headlamp Assembly - Right terminal 4 (Chevrolet with SBV)
- E13RA Headlamp Assembly - Right terminal 10 (Chevrolet)
- E13RA Headlamp Assembly - Right terminal 11 (Buick with SGM)
- E13RA Headlamp Assembly - Right terminal 8 (Buick with T4L)
- E42R Tail Lamp Assembly - Right terminal 5 (Chevrolet with UGE)
- E42R Tail Lamp Assembly - Right terminal 7 (Chevrolet with SBM)
- E42R Tail Lamp Assembly - Right terminal 3 (Buick with T4L)
- E42R Tail Lamp Assembly - Right terminal 3 (Buick with SGM)
- If 10 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 10 Ω
Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
- E4K Park Lamp - Right Front socket terminal (Chevrolet with SBM)
- E13RA Headlamp Assembly - Right terminal 7 (Chevrolet with SBV)
- E13RA Headlamp Assembly - Right terminal 9 (Chevrolet)
- E13RA Headlamp Assembly - Right terminal 10 (Buick with SGM)
- E13RA Headlamp Assembly - Right terminal 6 (Buick with T4L)
- E42R Tail Lamp Assembly - Right terminal 4 (Chevrolet with UGE)
- E42R Tail Lamp Assembly - Right terminal 3 (Chevrolet with SBM)
- E42R Tail Lamp Assembly - Right terminal 1 (Buick with T4L)
- E42R Tail Lamp Assembly - Right terminal 1 (Buick with SGM)
Verify the test lamp turns ON and OFF when commanding the Right Front Park 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.
  - Go to next step: 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
Test or replace the appropriate right park/marker lamp.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.