Chevrolet Trax: DTC B316B, B317A, B318A, OR B319A (AXG, AEF, AER): Window switch

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

DTC B316B

Driver Window Switch

DTC B317A

Passenger Window Switch

DTC B318A

Left Rear Window Switch

DTC B319A

Right Rear Window Switch

For symptom byte information, refer to Symptom Byte List .

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 (BCM). The BCM 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 BCM 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.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B316B 00

The BCM has detected a control switch on the driver window master switch has been active for greater than 60 seconds.

B316B 02

The driver window motor has detected the driver window master switch is active for greater than 60 seconds.

B317A 02

The passenger window motor has detected the passenger Window Switch is active for greater than 60 seconds.

B318A 02

The left rear window motor has detected the left rear Window Switch is active for greater than 60 seconds

B319A 02

The right rear window motor has detected the right rear Window Switch is active for greater than 60 seconds

B316B 39, B317A 39, B318A 39, B319A 39

The window motor has detected an internal failure within the affected door switch

Action Taken When the DTC Sets

The affected power window will malfunction.

Conditions for Clearing the DTC

B316B 00, B316B 02, B317A 02, B318A 02, B319A 02

• The DTC will be current for as long as the fault is present.
• The DTC will change from current to history when the fault is no longer present.
• A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

B316B 39, B317A 39, B318A 39, B319A 39

If the DTC is current, the affected Window Switch must be replaced before the DTC can be cleared.

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

1. Ignition ON.
2. 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.

If the parameters change

3. Verify the scan tool parameters listed below change when pressing and pulling the driver window control switch on the driver window master control:

• Driver Window Main Control Down Switch - Inactive and Active
• Driver Window Main Control Up Switch - Inactive and Active
• Driver Window Main Control Express Down Switch - Inactive and Active
• Driver Window Main Control Express Up Switch - Inactive and Active
• If any parameter does not change

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

• If all the parameters change

4. Verify the scan tool parameters listed below change when pressing and pulling the S79P Window Switch- Passenger, the S79LR Window Switch-Left Rear and the S79RR Window Switch-Right Rear.

• Passenger Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
• Left Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
• Right Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
• If any parameter does not change

Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.

• If all the parameters change

5. All OK.

Circuit/System Testing

Driver Window Switch Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON
2. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

• If not Inactive

1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
2. 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

3. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
4. Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. 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

3. 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 M74D Window Motor-Driver.

If Active

5. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
2. 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

6. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
7. Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V

3. 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 M74D Window Motor-Driver.
• If Active

8. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
2. 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

9. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
10. Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V

3. 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 M74D Window Motor-Driver.
• If Active

11. Test or replace the S79D Window Switch-Driver.

Passenger/Rear Window Switch Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the appropriate passenger or rear S79 Window Switch, ignition ON
2. Verify the appropriate scan tool Window Switch at Door parameter is Inactive.

• If not Inactive

1. Ignition OFF, disconnect the harness connector at the M74 Window Motor.
2. Test for infinite resistance between the signal circuit 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

3. 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

4. Verify the scan tool Window Switch at Door parameter is Up

If not Up

1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
2. 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

3. 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

5. Install a 3 A fused jumper wire between the signal 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

6. Verify the scan tool Window Switch at Door parameter is Down

If not Down

1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
2. 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

3. 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

7. Test for greater than 10 V between the signal circuit terminal 7 and ground.

• If less than 10 V

1. Ignition OFF, disconnect the harness connector at the M74 Window Motor.
2. Test for infinite resistance between the S79 Window Switch signal terminal 7 circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. 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

8. 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
• Rear Side Door Window Regulator Motor Replacement
• Front Side Door Window Regulator Motor Replacement

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