Fixed and Moveable Windows (AED/AEQ)
DTC B316B, B317A, B318A, or B319A (AED/AEQ)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 Symptom Byte List
Diagnostic Fault Information
Circuit/System Description
The driver window motor supplies 12V signal circuits to the driver window switch, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0V. The driver 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 appropriate passenger or rear window switch 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.
B316B 39
The driver window motor has detected an internal failure within the driver window switch
B317A 02
The BCM has detected the passenger window switch is active for greater than 60 seconds.
B317A 39
The BCM has detected an internal failure within the passenger window switch
B318A 02
The BCM has detected the left rear window switch is active for greater than 60 seconds
B318A 39
The BCM has detected an internal failure within the left rear window switch
B319A 02
The BCM has detected the right rear window switch is active for greater than 60 seconds
B319A 39
The BCM has detected an internal failure within the right rear window 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 Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Power Windows Description and Operation Power Windows
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References 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.
• 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, Down, Express Down
* Left Rear Window Switch at Door - Inactive, Up, Down, Express Down
* Right Rear Window Switch at Door - Inactive, Up, Down, Express Down
• If any parameter does not change
Test or replace the appropriate passenger or rear S79 Window Switch
• If all the parameters change
5. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the 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 signal circuit terminal 7 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 3 and ground.
4. Verify the scan tool Driver Window Main Control Down Switch parameter is Active
• If not Active
1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. 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
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 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
6. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
7. Verify the scan tool Driver Window Main Control Up Switch parameter is Active
• If not Active
1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. Test for less than 1 V between the signal circuit 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
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 signal circuit terminal 5 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 2 and ground.
10. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
• If not Active
1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. Test for less than 1 V between the signal circuit 5 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Rear Side Door Window Switch Replacement Rear Side Door Window Switch Replacement
* Front Side Door Window Switch Replacement - Left Side Front Side Door Window Switch Replacement - Left Side
* Front Side Door Window Switch Replacement - Right Side Front Side Door Window Switch Replacement - Right Side
* Front Side Door Window Regulator Motor Replacement Service and Repair