Chevrolet Trax: Power windows malfunction (AXG, AEF, AER)
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
The window motors supply 12 V signal circuits to their respective window
switches, when a window switch has
been activated, a switch closes providing a ground to the appropriate signal
circuit causing the voltage to drop
to 0 V. The window motor will detect the voltage drop in the signal circuit and
will command the window to
move in the desired direction.
The driver window master control switch also contains control switches for the
passenger, left rear and right
rear window functions. When a window switch is pressed, a serial data message is
sent to the body control
module. The body control module examines the request and checks for messages
from other power window
motors that may prohibit window movement. If no prohibitive messages have been
received, the body control
module will send a serial data message to the passenger window motor or to the
appropriate rear window motor
which will perform the command as requested.
Diagnostic Aids
The loss of the express up and express down functions for the driver,
passenger and rear windows may have
occurred for the following reasons:
- The battery was disconnected
- The battery was replaced
- A door wiring harness was disconnected
- A window motor was disconnected
The window motors will need to be normalized in order to restore the express
functions, refer to Window
Motor Programming - Express Function for the proper procedure.
Reference Information
Schematic Reference
Moveable Window Schematics (Encore), Moveable Window 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
Power Windows 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 driver window functions while commanding the Driver Window
Motor Up and Down with a
scan tool.
- If the window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver Window Motor Malfunction.
- If the window moves UP and DOWN as commanded
- Verify the driver window moves while commanding the window UP, express
UP, DOWN and express
DOWN with the S79D Window Switch-Driver.
- If the driver window does not move UP or DOWN as commanded
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
- If the driver window does not express UP or express DOWN
Normalize the driver window motor, refer to Window Motor Programming -
Express Function.
- If after normalization, the driver window does not express UP or
express DOWN
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
- If the driver window moves UP, express UP, DOWN and express DOWN as
commanded
- Verify the scan tool parameters listed below change when pressing and
pulling the switches for the
passenger, left rear and right rear window on the driver window master
control;
- Left Rear Main Control Down Switch - Inactive and Active
- Left Rear Main Control Express Switch - Inactive and Active
- Left Rear Main Control Up Switch - Inactive and Active
- Right Rear Main Control Down Switch - Inactive and Active
- Right Rear Main Control Express Switch - Inactive and Active
- Right Rear Main Control Up Switch - Inactive and Active
- Front Passenger Main Control Down Switch - Inactive and Active
- Front Passenger Main Control Express Switch - Inactive and Active
- Front Passenger Main Control Up Switch - Inactive and Active
- If any parameter does not change
Replace the S79D Window Switch-Driver.
- Verify the passenger, left rear and right rear window move while
commanding the Passenger Window
Motor, Left Rear Window Motor, and Right Rear Window Motor Up and Down with
a scan tool.
- If the window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Window Motor Malfunction.
- If the window moves UP and DOWN as commanded
- Verify the passenger and rear window moves while commanding the window
UP, express UP, DOWN
and express DOWN with the appropriate passenger or rear S79 Window Switch.
- If a passenger or rear window does not move UP or DOWN as commanded
Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.
- If a passenger or rear window does not express UP or express DOWN
Normalize the appropriate window motor, refer to Window Motor Programming -
Express
Function.
- If after normalization, a passenger or rear window does not express
UP or express DOWN
Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.
- If the passenger and rear window moves UP, express UP, DOWN and
express DOWN as
commanded
- All OK.
Circuit/System Testing
Window Motor Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the appropriate M74
Window Motor. It may take up to 2 minutes for all vehicle systems to power
down
- Test for less than 10 ohms between the ground circuit terminal 1 and
ground.
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
- Ignition ON.
- Verify a test lamp illuminates between the B+ circuit terminal 2 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 M74 Window Motor.
- If the test lamp illuminates
- Test or replace the M74 Window Motor.
Driver Window Switch Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the X1 harness
connector at the S79D Window
Switch-Driver. It may take up to 2 minutes for all vehicle systems to power
down.
- Test for less than 10 ohms between the ground circuit terminal 1 and
ground.
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
- Ignition ON.
- Verify a test lamp illuminates between the B+ circuit terminal 4 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 S79D Window Switch-Driver.
- If the test lamp illuminates
- Verify the scan tool Driver Window Main Control Down Switch parameter is
Inactive.
If not Inactive
- Ignition OFF, disconnect the harness connector at the M74D Window
Motor-Driver.
- Test for infinite resistance between the S79D Window Switch-Driver
signal circuit terminal 6 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the M74D Window Motor-Driver.
- If Inactive
- Install a 3 A fused jumper wire between the signal circuit terminal 6
and the ground circuit terminal 1.
- Verify the scan tool Driver Window Main Control Down Switch parameter is
Active
If not Active
- Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness
connector at the M74D
Window Motor-Driver, ignition ON.
- Test for less than 1 V between the S79D Window Switch-Driver signal
circuit terminal 6 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 M74D Window Motor-Driver.
- If Active
- Verify the scan tool Driver Window Main Control Up Switch parameter is
Inactive.
- Ignition OFF, disconnect the harness connector at the M74D Window
Motor-Driver.
- Test for infinite resistance between the S79D Window Switch-Driver
signal circuit terminal 2 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the M74D Window Motor-Driver.
- If Inactive
- Install a 3 A fused jumper wire between the signal circuit terminal 2
and the ground circuit terminal 1.
- Verify the scan tool Driver Window Main Control Up Switch parameter is
Active
- Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness
connector at the M74D
Window Motor-Driver, ignition ON.
- Test for less than 1 V between the S79D Window Switch-Driver signal
circuit 2 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 M74D Window Motor-Driver.
- If Active
- Verify the scan tool Driver Window Main Control Express Switch parameter
is Inactive.
If not Inactive
- Ignition OFF, disconnect the harness connector at the M74D Window
Motor-Driver.
- Test for infinite resistance between the S79D Window Switch-Driver
signal circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the M74D Window Motor-Driver.
- If Inactive
- Install a 3 A fused jumper wire between the signal circuit terminal 3
and the ground circuit terminal 1.
- Verify the scan tool Driver Window Main Control Express Switch parameter
is Active
- Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness
connector at the M74D
Window Motor-Driver, ignition ON.
- Test for less than 1 V between the S79D Window Switch-Driver signal
circuit 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 M74D Window Motor-Driver.
- If Active
- Test or replace the S79D Window Switch-Driver.
Passenger/Rear Window Switch Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the X1 harness
connector at the appropriate
passenger or rear S79 Window Switch. It may take up to 2 minutes for all
vehicle systems to power
down.
- Test for less than 10 ohms between the ground circuit terminal 1 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 10 ohms
- Ignition ON.
- Verify the appropriate scan tool Window Switch at Door parameter is
Inactive.
- Ignition OFF, disconnect the harness connector at the M74 Window Motor.
- Test for infinite resistance between the signal circuit terminal listed
below and ground:
- S79 Window Switch - signal circuit terminal 6
- S79 Window Switch - signal circuit terminal 8
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the M74 Window Motor.
- If Inactive
- Install a 3 A fused jumper wire between the circuit terminal listed
below and ground:
- S79P Window Switch-Passenger - signal circuit terminal 6
- S79LR Window Switch-Left Rear - signal circuit terminal 8
- S79RR Window Switch-Right Rear - signal circuit terminal 8
- Verify the scan tool Window Switch at Door parameter is Up
- Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness
connector at the M74
Window Motor, ignition ON.
- Test for less than 1 V between the S79 Window Switch circuit terminal
and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF, 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 M74 Window Motor.
- If Up
- Install a 3 A fused jumper wire between the circuit terminal listed
below and ground:
- S79P Window Switch-Passenger - signal circuit terminal 8
- S79LR Window Switch-Left Rear - signal circuit terminal 6
- S79RR Window Switch-Right Rear - signal circuit terminal 6
- Verify the scan tool Window Switch at Door parameter is Down
- Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness
connector at the M74
Window Motor, ignition ON.
- Test for less than 1 V between the S79 Window Switch signal circuit and
ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF, 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 M74 Window Motor.
- If Down
- Test for greater than 10 V between the signal circuit terminal 7 and
ground
- Ignition OFF, disconnect the harness connector at the M74 Window Motor.
- Test for infinite resistance between the S79 Window Switch signal
circuit terminal 7 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 signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance on the circuit.
- If less than 2 ohms, replace the M74 Window Motor.
- If greater than 10 V
- Test or replace the passenger or rear S79 Window Switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Front Side Door Window Switch Replacement (Driver Side, Encore),
Front Side Door Window
Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch
Replacement
(Driver Side, Trax), Front Side Door Window Switch Replacement (Passenger
Side, Trax)
- Rear Side Door Window Switch Replacement
- Front Side Door Window Regulator Motor Replacement
- Rear Side Door Window Regulator Motor Replacement
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:
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 Descriptors
D
WARNING: Refer to Brake Fluid Irritant Warning .
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution .
Inspect the brake fluid for the following conditions, indicating brake
fluid contamination:
Fluid separation, indicating 2 types of fluid are present. A substance