Glass, Frames and Mechanisms

Special Tool(s)

	Flex Probe Kit NUD105-R025D or equivalent
	Test Light SGT27000 or equivalent 250-300mA incandescent bulb test lamp

Principles of Operation

Delayed Accessory Power

The accessory delay relay supplies voltage to the power windows and the power roof opening panel (if equipped) when activated. The BCM activates the accessory delay relay whenever the ignition is in the RUN or the ACC mode, or when the ignition is changed from RUN or ACC to the OFF mode and the LH and RH front doors are closed.

The BCM deactivates the accessory delay relay when:

• the LH front door is ajar and the ignition is in the OFF or key-out mode.
• the RH front door is ajar and the ignition is in the OFF or key-out mode.
• ten minutes have elapsed since the ignition was changed from ACC or RUN to the OFF mode.

LH Front Power Window Control

The LH front door window motor is a 7-pin motor with integral electronics and must be initialized whenever a new window motor has been installed. Initialization is required to learn the full UP position and the profile of the glass as it travels through the glass channel. Once initialized, obstacle detection is enabled. When mechanical repairs have been carried out on the window regulator or glass run, the window motor must be de-initialized, and then initialized. The window control switch sends 2 separate signals to the window motor: up and down. When the window control switch is pressed to the first detent position, a 12-volt signal is sent to the window motor to request an up or down operation. When auto up or auto down is requested (switch pressed to the second detent position), the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the first signal received. If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor will not be able to determine the intended direction request and will not operate until the window control switch is released and pressed again. The up and down contacts are floating within the window control switch when the switch is in the neutral position. The up and down feeds to the window motor are all low current.

The LH front window motor uses feedback from 2 internal Hall-effect sensors coupled to the internal microprocessor to determine window glass position and operate the window motor. If the Hall-effect pulses are not being received by the microprocessor, the window motor runs for approximately one-half second and stops each time the switch is pressed. The motor contains software controlled thermal protection to protect the motor windings from overcurrent/overtemperature operation. Continued excessive operation of the motor causes the software control to shut off power to the motor, causing a loss of function until the window motor cools.

The LH front window motor operates with the ignition switch in the RUN or ACC modes, or when the accessory delay relay is active. The motor is supplied with B+ power and draws a key-off load of approximately 3/4 mA. The high current required to move the window is supplied through the B+ and motor ground input. For the motor to operate correctly, both power feeds and the ground feed must be intact at the window motor.

The LH front window motor will not lose initialization if power (B+) is removed while the window is not in motion. If power (B+) is disconnected from the window motor while the window is in motion, the window motor enters position recovery mode when power is restored (auto up will be disabled). Position recovery mode allows proportional up movement of the window until the window motor stalls the window glass into the upper header seal. If no internal or external faults are present, the window motor automatically resumes normal (full) operation.

When the LH front window motor is operating in auto up or auto down mode, movement of the window can be stopped by pressing the switch to any position (up, down, auto up, auto down). The window control switch must be released before the window will move again.

The master window control switch has illumination and illumination ground inputs, which are used to illuminate the switch when the headlamp switch is turned to the PARK or ON position (the autolamp position may also energize this input). These switch inputs do not directly affect operation of the window(s). The window control switch uses the delayed accessory power input, which is transferred to the up or down outputs when the corresponding switch contact is closed. If the delayed accessory feed to the driver window control switch is missing, none of the windows will function.

If there is an open in the master window control switch or the associated wiring, the related function becomes inoperative. If the up contact of the switch or the associated wiring develops an open circuit, the window only operates in the down direction. If the down contact of the switch or the associated wiring develops an open circuit, the window only operates in the up direction.

A new LH front window motor will not operate in one-touch up mode, and the bounce-back feature will be disabled prior to initialization. If the switch is actuated to the auto UP or auto DOWN position and released, window movement will stop when the up or down contact in the window control switch is released. If the window motor is removed from the window regulator drum housing, or if a new window motor is installed, it must be initialized. Refer to Window Motor Initialization in this section.

The LH front window motor automatically adjusts to system changes throughout its life: changes in seal drag and slight changes in the full OPEN position occur and are automatically compensated for. Once initialized, the window motor soft stalls into the lower position contributing to extended durability of the system. If the window does not seal completely in the full UP position (very small gaps/non-bounce-back events only), the window switch can be actuated to the UP position and the window is energized for a fraction of a second to fully seal and this new position is learned.

Bounce-Back

The LH front window motor has a bounce-back feature. If an obstacle has been detected in the window opening as the window glass is moving upward, the window motor automatically reverses direction and moves the glass toward the bounce-back position (in both up and one-touch up modes). If an obstruction occurs between 4 mm (0.15 in) and 200 mm (7.87 in) of the window opening, the bounce-back position is 250 mm (9.84 in) of window opening. If an obstruction occurs at a position greater than 200 mm (7.87 in) of the window opening, the bounce-back position is 50 mm (1.96 in) below where the obstruction occurred.

Security Override

To override a bounce-back condition (to overcome the resistance of ice on the window or seals for example), within 2 seconds after the window reaches the bounce-back position, pull and hold the window control switch. The window travels up with no bounce-back or pinch protection. If the window control switch is released before the window is fully closed, the window stops. If the ignition switch is turned to OFF or START (without delayed accessory), the window motor stops.

Rear Passenger Window Operation

Rear passenger windows may be raised or lowered using the master window control switch or the corresponding passenger window control switch. The rear passenger window control switches receive voltage when the accessory delay relay is active and the LH front window lockout switch is in the UNLOCK position. When the LH front window lockout switch is in the LOCK position, the rear passenger windows only operate from the master window control switch.

Rear Window Defrost

When the rear window defrost switch (integral to the FCIM ) is pressed and the engine is running, the HVAC module activates the rear window defrost relay located in the BJB . When the rear window defrost relay is active, the rear window defrost grid is energized.

If equipped, the rear window defrost can also be commanded on and off using voice commands or by touching the rear window defrost button located on the touchscreen interface. For additional information about voice or touchscreen commanded features, refer to the Owner's Literature.

The HVAC module deactivates the rear window defrost relay when one of the following conditions is met:

• The rear window defrost switch is pressed when the feature is active
• If equipped, the rear window defrost is commanded off using voice command or the touchscreen interface when the feature is active
• Ignition switch state is changed from RUN to OFF/LOCK
• The 15-minute timing function is completed

Remote Start Climate Operation (if equipped)

The customer can select different climate control modes/preferences when the vehicle is started using the remote start feature. This can be accessed through the message center. For additional information on how to set the remote start preferences, refer to the Owner's Literature. When the rear defrost is set to AUTO mode, the rear window defrost activates when the outside temperature is less than 0°C (32°F) and the vehicle is started using the remote start feature. No climate control adjustments are recognized during remote start operation. Once the ignition is cycled to the ON mode, the climate control system returns to the previous settings (last ignition ON cycle) and adjustments can be made normally. If the previous setting was off, the climate control system turns off.

Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.
   
   

     Visual Inspection Chart

   Mechanical	Electrical
   Door window regulator and motor Door glass run Door window glass	Loose, corroded connectors Circuitry Window control switch Battery Junction Box (BJB) fuses: 26 (40A) 93 (5A) Body Control Module (BCM) fuses: 1 (30A) 32 (15A) BCM circuit breaker 48 (30A) Rear window defrost relay Accessory delay relay Rear window grid

   
   

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.

   If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

5. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM .

   If the scan tool does not communicate with the VCM :
   • check the VCM connection to the vehicle.
   • check the scan tool connection to the VCM .
   • refer to Section 418-00 , No Power To The Scan Tool, to diagnose no power to the scan tool.

6. If the scan tool does not communicate with the vehicle:
   • verify the ignition is in the ON mode.
   • verify the scan tool operation with a known good vehicle.
   • refer to Section 418-00 , The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.

7. Carry out the network test:
   • If the scan tool responds with no communication from one or more modules, refer to Section 418-00 .
   • If the network test passes, retrieve and record the Continuous Memory Diagnostic Trouble Codes (CMDTCs).

8. Clear the continuous DTCs and carry out the self-test diagnostics for the BCM and HVAC module.

9. If the DTCs retrieved are related to the concern, go to the Body Control Module (BCM) DTC Chart or HVAC Module DTC Chart. For all other DTCs, refer to Section 419-10 .

10. If no DTCs related to the concern are retrieved, GO to Symptom Chart .

DTC Charts

 Body Control Module (BCM) DTC Chart

 HVAC Module DTC Chart

Symptom Chart

Pinpoint Tests

Pinpoint Test A: All Power Windows are Inoperative

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The accessory delay relay is controlled by the BCM and provides the voltage for all power window operation. Refer to Delayed Accessory Power in Principles of Operation.

This pinpoint test is intended to diagnose the following:
• Accessory delay relay
• Wiring, terminals or connectors
• Master window control switch
• BCM

PINPOINT TEST A: ALL POWER WINDOWS ARE INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test B: All Passenger Power Windows are Inoperative

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The RH front, LH and RH rear window control switches share a common high current voltage circuit and ground circuit.

This pinpoint test is intended to diagnose the following:
• Circuit breaker
• Wiring, terminals or connectors
• Master window control switch

PINPOINT TEST B: ALL PASSENGER POWER WINDOWS ARE INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test C: A Single Power Window is Inoperative — LH Front

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

NOTE: A new LH front power window motor will not operate in one-touch up mode until initialized. Refer to Window Motor Initialization in this section.

NOTE: The LH front power window motor must be initialized whenever a new motor is installed.

NOTE: The LH front power window motor must be de-initialized, then initialized whenever the LH front window motor is removed from the window regulator drum housing, a new window regulator is installed, a new window glass is installed, a new top run is installed or for any operation in which grease or lubricants are applied to the window regulator or glass run.

Normal Operation

The window control switch sends 2 separate signals to the window motor: up and down. When the window control switch is pressed to the first detent position, a 12-volt signal is sent to the window motor to request an up or down operation. When auto up or auto down is requested (switch pressed to the second detent position), the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the first signal received. If the window control switch is pressed too quickly to the second detent position (less than 5 ms of time between first detent signal and second detent signal), the window motor is unable to determine the intended direction request and will not operate until the window control switch is released and pressed again. The up and down feeds to the window motor are all low current. The high current required to operate the front window is supplied to the motor through a dedicated power and ground circuit.

This pinpoint test is intended to diagnose the following:
• Fuse(s)
• Wiring, terminals or connectors
• Window motor
• Master window control switch

PINPOINT TEST C: A SINGLE POWER WINDOW IS INOPERATIVE — LH FRONT

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test D: A Single Power Window is Inoperative — RH Front

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The RH front window control switch contains 2 relays which, when at rest (inactive), provide a ground path to the power window motor circuit(s). When the master window control switch or RH front window control switch is activated, the corresponding relay in the RH window control switch is energized supplying voltage (high current) to operate the power window motor in the desired direction. The RH front window motor is bi-directional. Window direction is determined by the polarity of the voltage and ground being supplied to the motor from the window control switch(es).

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Window control switch
• Window motor

PINPOINT TEST D: A SINGLE POWER WINDOW IS INOPERATIVE — RH FRONT

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test E: A Single Power Window is Inoperative — LH Rear

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The LH rear window control switch receives low current power from the master window control switch whenever the window lockout switch is set to the UNLOCK position and the accessory delay relay is active. The LH rear window control switch contains 2 relays which, when at rest (inactive), provide a ground path to the power window motor circuit(s). When the master window control switch or LH rear window control switch is activated, the corresponding relay located in the LH rear window control switch is energized supplying voltage (high current) to operate the power window motor in the desired direction. The LH rear window motor is bi-directional. Window direction is determined by the polarity of the voltage and ground being supplied to the motor from the window control switch(es).

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Window control switch
• Window motor

PINPOINT TEST E: A SINGLE POWER WINDOW IS INOPERATIVE — LH REAR

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test F: A Single Power Window is Inoperative — RH Rear

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The RH rear window control switch receives low current power from the master window control switch whenever the window lockout switch is set to the UNLOCK position and the accessory delay relay is active. The RH rear window control switch contains 2 relays which, when at rest (inactive), provide a ground path to the power window motor circuit(s). When the master window control switch or RH rear window control switch is activated, the corresponding relay located in the RH rear window control switch is energized supplying voltage (high current) to operate the power window motor in the desired direction. The RH rear window motor is bi-directional. Window direction is determined by the polarity of the voltage and ground being supplied to the motor from the window control switch(es).

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Window control switch
• Window motor

PINPOINT TEST F: A SINGLE POWER WINDOW IS INOPERATIVE — RH REAR

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test G: The One-Touch Up/Down Feature is Inoperative — LH Front Window Only

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

NOTE: A new power window motor will not operate in one-touch up mode until initialized. Refer to Window Motor Initialization in this section.

NOTE: The power window motor must be initialized whenever a new motor is installed.

NOTE: The power window motor must be de-initialized, then initialized whenever the window motor is removed from the window regulator drum housing, a new window regulator is installed, a new window glass is installed, a new top run is installed or for any operation in which grease or lubricants are applied to the window regulator or glass run.

Normal Operation

During normal operation, when the window control switch is pressed to the second detent position to request an auto up or auto down operation, the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the first signal received (first detent position). If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor will not be able to determine the intended direction request and will not operate until the window control switch is released and pressed again.

This pinpoint test is intended to diagnose the following:
• Battery power was lost while LH front window was operating
• Window motor not initialized
• Window motor
• Master window control switch

PINPOINT TEST G: THE ONE-TOUCH UP/DOWN FEATURE IS INOPERATIVE — LH FRONT WINDOW ONLY

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test H: The Defrost System is Inoperative

Refer to Wiring Diagrams Cell 56 , Heated Window for schematic and connector information.

Normal Operation

Refer to Rear Window Defrost in Glass, Frames and Mechanisms .

• DTC B1C83:13 (Rear Defog Relay: Circuit Open ) — This DTC sets when the HVAC module senses an open in the rear window defrost relay control circuit.

This pinpoint test is intended to diagnose the following:
• Fuse(s)
• Rear window defrost relay
• Wiring, terminals or connectors
• Rear window defrost grid
• FCIM
• HVAC module

PINPOINT TEST H: THE DEFROST SYSTEM IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test I: The Defrost System Will Not Shut Off Automatically

Refer to Wiring Diagrams Cell 56 , Heated Window for schematic and connector information.

Normal Operation

Refer to Rear Window Defrost in Glass, Frames and Mechanisms .

• DTC B1C83:11 (Rear Defog Relay: Circuit Short to Ground) — This DTC sets when the HVAC module detects a short to ground is present on the rear window defrost relay control circuit.

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Rear window defrost relay
• HVAC module

PINPOINT TEST I: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLY

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test J: The Delayed Accessory is Inoperative

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The accessory delay relay is located in the Body Control Module (BCM). When the ignition is turned ON, the BCM activates the accessory delay relay, which provides voltage to the LH front window switch. The delayed accessory feature remains active for 10 minutes after the ignition is turned OFF or until either front door is opened.

• DTC B131A:12 (Delayed Accessory Power: Circuit Short To Battery) — This DTC sets when the BCM detects a short to voltage is present on the accessory delay relay control circuit.
• DTC B131A:14 (Delayed Accessory Power: Circuit Short To Ground or Open) — This DTC sets when the BCM detects a short to ground or open is present on the accessory delay relay control circuit.

This pinpoint test is intended to diagnose the following:
• Fuse
• Accessory delay relay
• Wiring, terminals or connectors
• BCM

PINPOINT TEST J: THE DELAYED ACCESSORY IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Pinpoint Test K: The Delayed Accessory Does Not Turn Off

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

Refer to Delayed Accessory Power in Glass, Frames and Mechanisms .

• DTC B131A:14 (Delayed Accessory Power: Circuit Short To Ground or Open) — This DTC sets when the BCM detects a short to ground or open is present on the accessory delay relay control circuit.

This pinpoint test is intended to diagnose the following:
• Accessory delay relay
• Wiring, terminals or connections
• BCM

PINPOINT TEST K: THE DELAYED ACCESSORY DOES NOT TURN OFF

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Component Test

Grid Wire Test

1. Using a bright lamp in the vehicle, inspect the grid wire from the exterior. A broken grid wire will appear as a brown spot.

2. Run the engine at idle. Set the heated rear window switch to ON. The indicator light should come on.

3. Working in the vehicle with a voltmeter, contact the broad red-brown stripes of the rear glass window positive lead to battery side and the negative lead to ground side. The meter should read 10-13 volts. A lower voltage reading indicates a loose ground connection.

4. Contact a good ground point with the negative lead of the meter. The voltage reading should not change.

5. With the negative lead of the meter grounded, touch each grid line of the heated rear window glass at its midpoint with the positive lead. A reading of approximately 6 volts indicates the line is good. A reading of 0 volt indicates the line is broken between the midpoint and the B+ side of the grid line. A reading of 12 volts indicates the circuit is broken between the midpoint of the grid line and ground.

6. Pinpointing the exact position of the break can be accomplished (if the voltmeter reads 0 volt when the midpoint of the grid line is touched with the positive lead of the voltmeter) by moving the positive lead of the voltmeter toward the B+ side of the grid line and touching the grid line until the voltmeter reads 12 volts. If the voltmeter reads 12 volts when the midpoint of the grid line is touched with the positive lead of the voltmeter, simply move the positive lead of the voltmeter toward the ground connection of the grid line and touch the grid line until the voltmeter reads 0 volt.