Chevrolet Trax: DTC B3951
- Ignition OFF, disconnect the X5 harness connector at the K9 Body Control
Module, ignition ON.
- Verify a test lamp illuminates between the B+ circuit terminal 3 and
ground.
- If the test lamp does not illuminate and the circuit fuse is good
- Ignition OFF.
- Test for less than 2 ohms in the B+ circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, verify the fuse is not open and there is voltage at
the fuse.
- If the test lamp does not illuminate and the circuit fuse is open
- Ignition OFF.
- Test for infinite resistance between the B+ circuit 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 the test lamp illuminates
- Ignition OFF, connect the X5 harness connector at the K9 Body Control
Module.
- Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the
E4RR Turn Signal Lamp Bulb -
Right Rear.
- Test for less than 5 ohms between the ground circuit at the socket
terminal 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 control circuit at the socket terminal
and ground, ignition ON.
- Verify the test lamp turns ON and OFF when commanding the Right Rear
Turn Signal Lamp 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
- Test or replace the E4RR Turn Signal Lamp Bulb - Right Rear.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Rear Turn Signal Lamp Bulb Replacement (Trax) , Rear Turn Signal Lamp
Bulb Replacement
(Encore)
- 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
Ignition OFF, disconnect the harness connector at the B22 Brake Pedal
Position Sensor, ignition ON.
Verify a test lamp illuminates between the appropriate low reference
circuit terminal listed
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:
If equipped, the traction control
system limits wheel spin. The
system is on when the vehicle is
started.
If equipped, the StabiliTrak system
assists with directional control of the
vehicle in difficult driving conditions.
The system is on when the vehicle
is started.
To turn off traction contro
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