Chevrolet Trax: Park, license, and/or tail lamps malfunction
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault Information
Circuit/System Description
When the headlamp switch is placed in the HEAD or PARK position, ground is
applied to the park lamp switch
ON signal circuit to the body control module (BCM). The BCM responds by applying
voltage to the park
lamps, tail lamps, and license lamps control circuits illuminating the park,
tail, and license lamps.
Diagnostic Aids
When testing at the park lamp bulb socket, make sure all measurements and
test lamp connections are in the
correct terminal location and do not come in contact with each other during
testing.
Reference Information
Schematic Reference
Exterior Lights Schematics (Encore) , Exterior Lights Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify the scan tool Park Lamp Switch parameter changes between
Active and Inactive while
commanding the park lamps ON and OFF with the headlamp switch.
- If the parameter does not change
Refer to Park Lamp Switch Malfunction.
- Verify the left park lamps turn ON and OFF when commanding the Left Park
Lamps ON and OFF with a
scan tool.
- If the left park lamps do not turn ON and OFF
Refer to Park Lamps Malfunction.
- If the left park lamps turn ON and OFF
- Verify the right park lamps turn ON and OFF when commanding the Right
Park Lamps ON and OFF
with a scan tool.
- If the right park lamps do not turn ON and OFF
Refer to Park Lamps Malfunction.
- If the right park lamps turn ON and OFF
- Verify the license plate lamps turn ON and OFF when commanding the
License Plate Lamps ON and
OFF with a scan tool.
- If the license plate lamps do not turn ON and OFF
Refer to License Plate Lamps Malfunction
- If the license plate lamps turn ON and OFF
- All OK.
Circuit/System Testing
Park Lamp Switch Malfunction
- Ignition OFF, all doors closed, all accessories OFF, disconnect the
harness connector at the S30
Headlamp Switch. It may take up to 2 minutes for all vehicle systems to
power down.
- Test for less than 15 ohms between the ground circuit terminal 6 and
ground.
If 15 ohms or greater
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
- If less than 15 ohms
- Ignition ON.
- Verify the scan tool Park Lamps Switch parameter is Inactive.
- Ignition OFF, disconnect the X1 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
- If Inactive
- Install a 3 A fused jumper wire between the signal circuit terminal 3
and the ground circuit terminal 6.
- Verify the scan tool Park Lamps Switch parameter is Active.
- Ignition OFF, disconnect the X1 harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit terminal 3 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module.
- If Active
- Test or replace the S30 Headlamp Switch.
Park Lamps Malfunction
- Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect
the harness connector at the
appropriate park lamp.
- Test for less than 10 ohms between the appropriate ground circuit
terminal listed below and ground.
- E4J Park Lamp - Left Front socket terminal
- E4K Park Lamp - Right Front socket terminal
- E2LR Side Marker Lamp - Left Rear socket terminal
- E2RR Side Marker Lamp - Right Rear socket terminal
- If 10 ohms or greater
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
- If less than 10 ohms
- Connect a test lamp between the appropriate control circuit terminal
listed below and ground, ignition
ON.
- E4J Park Lamp - Left Front socket terminal
- E4K Park Lamp - Right Front socket terminal
- E2LR Side Marker Lamp - Left Rear socket terminal
- E2RR Side Marker Lamp - Right Rear socket terminal
- Verify the test lamp turns ON and OFF when commanding the appropriate
Park Lamps ON and OFF with
a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the appropriate harness connector listed below
at the K9 Body Control
Module.
- 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
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the appropriate harness connector listed below
at the K9 Body Control
Module, ignition ON.
- 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
- Test or replace the appropriate park lamp.
License Plate Lamps Malfunction
- Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove both
E7 License Plate Lamp bulbs.
- Test for less than 5 ohms between each ground circuit terminal 2 and
ground.
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
- If less than 5 ohms
- Connect a test lamp between the E7L License Plate Lamp - Left control
circuit terminal 1 and ground,
ignition ON.
- Verify the test lamp turns ON and OFF when commanding the License Plate
Lamps ON and OFF with a
scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X4 harness connector at the K9 Body Control
Module.
- 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
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the X4 harness connector at the K9 Body Control
Module, ignition ON.
- 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
- Connect a test lamp between the E7R License Plate Lamp - Right control
circuit terminal 1 and ground,
ignition ON.
- Verify the test lamp turns ON and OFF when commanding the License Plate
Lamps ON and OFF with a
scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X4 harness connector at the K9 Body Control
Module.
- 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
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module.
- If the test lamp turns ON and OFF
- Test or replace the appropriate E7 License Plate Lamp bulb.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Headlamp Switch Replacement (Encore) , Headlamp Switch Replacement (Trax)
- Tail Lamp Replacement (Trax) , Tail Lamp Replacement (Encore)
- Parking and Turn Signal Lamp Bulb Replacement (Left Hand) , Parking
and Turn Signal Lamp
Bulb Replacement (Right Hand)
- Rear License Plate Lamp Bulb Replacement
- Control Module References for BCM replacement, programming, and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Instrument Panel Illumination Control
This feature controls the brightness
of the instrument panel controls and
infotainment display screen. The
thumbwheel is to the left of the
steering column on the instrument
panel.
(Instrument Panel
Brightness): Move the
thumbwheel up or down and hold, to
b
Voice Command Button
Blue OnStar Button
Emergency Button
This vehicle may be equipped with a
comprehensive, in-vehicle system
that can connect to a live OnStar
Advisor for Emergency, Security,
Navigation, Connection, and
Diagnostic Services. OnStar
services may require a paid
subscription. OnSt