Chevrolet Trax: Turn signal lamps and/or indicators 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
Ground is applied at all times to the turn signal/multifunction switch. The
turn signal lamps may only be
activated with the ignition switch in the ON or START positions. When the turn
signal/multifunction switch is
placed in either the turn right or turn left position, ground is applied to the
body control module (BCM) through
either the right turn or left turn signal switch signal circuit. The BCM
responds to the turn signal switch input by
applying a pulsating voltage to the front and rear turn signal lamps through
there respective control circuits.
When a turn signal request is received by the BCM, a serial data message is sent
to the instrument cluster
requesting the respective turn signal indicator be pulsed ON and OFF.
Diagnostic Aids
When testing at the turn signal 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)
- Body Control System Schematics (Encore) , Body Control System
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 Right Turn Signal Switch and Left Turn Signal
Switch parameters change between
Active and Inactive while cycling the turn signal switch between the right
and left positions.
- If the parameters do not change
Refer to Turn Signal/Multifunction Switch Malfunction.
- Verify the left front turn signal lamps turn ON and OFF while commanding
the Left Front Turn Signal
Lamp ON and OFF with a scan tool.
- If the left front turn signal lamps do not turn ON and OFF
Refer to Turn Signal Lamps Malfunction.
- If the left front turn signal lamps turn ON and OFF
- Verify the right front turn signal lamps turn ON and OFF while
commanding the Right Front Turn Signal
Lamp ON and OFF with a scan tool.
- If the right front turn signal lamps do not turn ON and OFF
Refer to Turn Signal Lamps Malfunction
- If the right front turn signal lamps turn ON and OFF
- Verify the left rear turn signal lamps turn ON and OFF while commanding
the Left Rear Turn Signal
Lamp ON and OFF with a scan tool.
- If the left rear turn signal lamps do not turn ON and OFF
Refer to Turn Signal Lamps Malfunction
- If the left rear turn signal lamps turn ON and OFF
- Verify the right rear turn signal lamps turn ON and OFF while commanding
the Right Rear Turn Signal
Lamp ON and OFF with a scan tool.
- If the right rear turn signal lamps do not turn ON and OFF
Refer to Turn Signal Lamps Malfunction.
- If the right rear turn signal lamps turn ON and OFF
- Verify the left and right turn signal indicators turn ON and OFF while
commanding the All Indicators
Test ON and OFF with a scan tool.
- If the left or right turn signal indictors do not turn ON and OFF
Refer to Turn Signal Indicators Malfunction
- If the left and right turn signal indictors turn ON and OFF
- All OK.
Circuit/System Testing
Turn Signal/Multifunction Switch Malfunction
- Ignition OFF, scan tool disconnected, all doors closed, all accessories
OFF, disconnect the harness
connector at the S78 Turn Signal/Multifunction 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 3 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 Left Turn Signal Switch parameter is Inactive.
- Ignition OFF, disconnect the X3 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 1 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 1
and the ground circuit terminal 3.
- Verify the scan tool Left Turn Signal Switch parameter is Active.
- Ignition OFF, disconnect the X3 harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit terminal 1 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
- Verify the scan tool Right Turn Signal Switch parameter is Inactive.
- Ignition OFF, disconnect the X3 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 7 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 7
and the ground circuit terminal 3.
- Verify the scan tool Right Turn Signal Switch parameter is Active.
- Ignition OFF, disconnect the X3 harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit terminal 7 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 S78 Turn Signal/Multifunction Switch.
Turn Signal Lamps Malfunction
- Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect
the harness connector at the
appropriate E4 Turn Signal Lamp.
- Test for less than 5 ohms between the appropriate ground circuit
terminal listed below and ground.
- E4LF Turn Signal Lamp - Left Front socket terminal
- E4RF Turn Signal Lamp - Right Front socket terminal
- E4Y Turn Signal Repeater Lamp - Left terminal 1
- E4Z Turn Signal Repeater Lamp - Right terminal 1
- E4LR Turn Signal Lamp - Left Rear socket terminal
- E4RR Turn Signal Lamp - Right Rear socket terminal
- If 5 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 5 ohms
- Connect a test lamp between the appropriate control circuit terminal
listed below and ground.
- E4LF Turn Signal Lamp - Left Front socket terminal
- E4RF Turn Signal Lamp - Right Front socket terminal
- E4Y Turn Signal Repeater Lamp - Left terminal 2
- E4Z Turn Signal Repeater Lamp - Right terminal 2
- E4LR Turn Signal Lamp - Left Rear socket terminal
- E4RR Turn Signal Lamp - Right Rear socket terminal
- Verify the test lamp turns ON and OFF when commanding the appropriate
Turn Signal Lamp 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.
- X5 left turn signals
- X4 right turn signals
- 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.
- X5 left turn signals
- X4 right turn signals
- 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 E4 Turn Signal Lamp.
Turn Signal Indicators Malfunction
- Ignition ON.
- Verify the left and right turn signal indicators turn ON and OFF while
commanding the All Indicators
Test ON and OFF with a scan tool.
- If the left or right turn signal indictors are always OFF or remain
ON
Replace the P16 Instrument Cluster.
- If the left and right turn signal indictors turn ON and OFF
- Replace the K9 Body Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Parking and Turn Signal Lamp Bulb Replacement (Left Hand) , Parking
and Turn Signal Lamp
Bulb Replacement (Right Hand)
- Rear Turn Signal Lamp Bulb Replacement (Trax) , Rear Turn Signal Lamp
Bulb Replacement
(Encore)
- Turn Signal Switch Replacement (Trax) , Turn Signal Switch
Replacement (Encore)
- Front Turn Signal Lamp Bulb Replacement (Left hand) , Front Turn
Signal Lamp Bulb
Replacement (Right Hand)
- Control Module References for BCM or Instrument Cluster replacement,
programming, and setup
READ NEXT:
NOTE:
Brake system does not use a brake switch, stoplight switch or brakelight
switch. System uses a Brake Pedal Position Sensor to control these functions.
Calibration Criteria
NOTE:
Do not apply the
Fig. 5: Headlamp Switch
Headlamp Switch Replacement (Encore)
HEADLAMP SWITCH REPLACEMENT (TRAX)
Fig. 6: Headlamp Switch
Headlamp Switch Replacement (Trax)
HAZARD WARNING SWITCH REPLACEMENT (TR
SEE MORE:
The vehicle has an indicator to warn
of the engine overheating. See
Engine Coolant Temperature
Warning Light
If the decision is made not to lift the
hood when this warning appears,
get service help right away. See
Roadside Assistance Program
If the decision is made to lift the
hood, make sure the ve
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.
DTC Descriptor
DT