Rear Window Defogger Operation
The rear defog control system utilizes a single zone backlight design, driven with a single relay configuration. Additionally, up to two outside rear view mirrors can be heated if required. A switch for control of the system is provided within the HVAC control head. Also included in the HVAC control head is an indicator to inform the customer about the current state of the system. The system is only operational when engine is running or during remote start.
Pressing the heated rear window switch on the HVAC control face plate causes the HVAC control head to send a serial data message to the HVAC control module requesting rear window defog operation. The HVAC control module upon receipt of the serial data message will provide voltage to the coil side of the rear window defogger relay, this will energize the relay causing the relay switch contacts to close allowing B+ voltage to flow through the rear defogger grid control circuit to the rear defogger grid.
When the rear heated window switch is pressed and the engine is running, the rear defog control system will remain active for 10 minutes. After the initial cycle has lapsed, pressing the switch again will continue rear window defogger operation, but the cycle will only last 5 minutes. The rear defog control system will function continuously if the vehicle speed is greater than 70 kilometers per hour (45 mph).
Stationary Window Description
Most stationary windows, specifically windshields, are retained to the body with adhesive which adheres the window to the body, increasing structural integrity. The reinstallation of the windows with adhesive requires complete replacement of the adhesive bead, and is known as the full cut method. All stationary windows must use a adhesive systems which meet GM Specification GM 3651G
Urethane Adhesive Description
For replacement of any adhesive-installed window, use the full cut method only.
Use adhesive systems which meet GM Specification GM 3651G.
Use these materials based on specific manufacturer. Do NOT intermix primers or adhesives from one manufacturer to another.
Always follow the system manufacturer's instructions for application, handling, and curing.
Inside Rearview Mirror with the Automatic Day-Night Feature System Operation
The inside rearview mirror uses 2 photocell sensors. One sensor is the headlight sensor, located on the face side of the mirror. The headlight sensor is used to determine light conditions present at the mirror face. The other sensor is the ambient light sensor, located on the rear of the mirror or windshield side. The ambient light sensor is used to determine the exterior light conditions. With a low exterior light condition detected, and a high light condition from behind the car, at the headlight sensor, the inside rearview mirror will automatically darken the face of the mirror.
In the daytime, the mirror is in a normal state because of the high exterior light condition that is indicated by the ambient light sensor. With the gear selector lever in the REVERSE position and the engine running, backup lamp supply voltage is supplied as an input to the inside rearview mirror. The mirror monitors this input to disable the automatic day-night setting. This allows the driver to see objects in the mirror clearly when reversing, even during the night.
Driver Outside Rearview Mirror with Automatic Day-Night System Operation (If Equipped)
The automatic day-night feature of the driver outside rearview mirror is controlled by the inside rearview mirror. The inside rearview mirror supplies control and low reference to the driver outside rearview mirror. At night, with the automatic day-night feature enabled, the driver outside rearview mirror will automatically darken with the inside rearview mirror to reduce glare from headlamps behind the vehicle.
Power Mirror System Operation
The outside mirror switch receives power through the battery positive voltage circuit from the underhood fuse block. The outside mirror switch also receives a constant ground.
The 4 positions of the direction switch have multiple switch contacts. When not in use, the directional contacts are isolated from any circuit. Each of the contacts are connected to opposing sides of the appropriate mirror motors through the selector switch. The selector switch interrupts or completes these circuits depending on the position of the selector switch, L or R.
If the mirror select switch is placed in the L position and the up switch is pressed, battery voltage will be supplied to the driver outside mirror vertical motor through the driver mirror motor up control circuit and return to the mirror switch through the driver mirror motor left/down control circuit, then to ground and the mirror will move up. If the down switch is pressed, the driver mirror motor left/down control circuit supplies battery voltage and the driver mirror motor up control circuit completes the path to the mirror switch, then to ground and the mirror will move down.
The remainder of the mirror functions operate in the same manner as described above. Placing the mirror control switch in opposing positions, left/right or up/down, will reverse the voltage polarity to the mirror motor, utilizing the same circuits and the mirror will move accordingly.
Circuit/System Description
When the HVAC control module receives a rear window defog request from the HVAC control faceplate, the HVAC control module will supply voltage to the relay coil. Battery positive voltage is supplied at all times to the relay switched input and the relay coil is always grounded. This allows battery positive voltage from the relay switched input to flow through the switch contacts and out the relay switched output to the rear window defogger grid.
Description and Operation
REAR WINDOW DEFOGGER DESCRIPTION AND OPERATION
When a switch is pressed on the driver window switch panel, 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 which prohibit the 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 switch which will perform the command as requested.
POWER WINDOWS DESCRIPTION AND OPERATION
When a switch is pressed on the driver window switch panel, 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 which prohibit the 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 switch which will perform the command as requested.
POWER WINDOWS DESCRIPTION AND OPERATION
The outside rearview mirror switch is a multiplex switch which signals the left mirror control module which outside rearview mirror to move (driver or passenger) and which direction to move it. The left mirror control module and the passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the left mirror control module. When the memory seat module receives the switch inputs from the left mirror control module, mirror output commands are sent to the appropriate switch through the serial data circuit. The left mirror control module and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The left mirror control module and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the left mirror control module and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
When the HVAC control module receives a rear window defog request from the HVAC control faceplate, the HVAC control module will supply voltage to the relay coil. Battery positive voltage is supplied at all times to the relay switched input and the relay coil is always grounded. This allows battery positive voltage from the relay switched input to flow through the switch contacts and out the relay switched output to the rear window defogger grid.
REAR WINDOW DEFOGGER DESCRIPTION AND OPERATION
When a switch is pressed on the driver window switch panel, 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 which prohibit the 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 switch which will perform the command as requested.
Each power window motor is controlled by their respective window switches. When a power window switch is activated to a desired position, power window switch will send a signal to its respective door window motor to move the window to the desired position.
POWER WINDOWS DESCRIPTION AND OPERATION
The R/DEFOG relay supplies voltage to the outside rearview mirror heater elements based on the current state of the rear window defogger. The relay supplies B+ through the driver/passenger mirror heating element control circuit when a request is seen.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
The inside rearview mirror uses 2 photocell sensors. One sensor is the rear light sensor, located on the face side of the mirror, facing the rear of the vehicle. The rear light sensor is used to determine light conditions present at the mirror face. The other sensor is the front light sensor, located on the backside of the mirror, facing the front of the vehicle. The front light sensor is used to determine the exterior light conditions at the front of the vehicle. With a low exterior light condition detected by the front light sensor and a high light condition from the rear light sensor, the inside rearview mirror will automatically darken the face of the inside rearview mirror and the driver outside rearview mirror. The inside rearview mirror provides a signal circuit and a low reference circuit to the driver mirror face to darken the mirror when needed.
With the gear selector lever in the REVERSE position and the vehicle running, backup lamp control voltage is supplied as an input to the inside rearview mirror. The mirror monitors this input to disable the automatic day-night setting. This allows the driver to see objects in the mirror clearly when reversing, even during the night, regardless of the status of the rear light sensor.
AUTOMATIC DAY-NIGHT MIRROR DESCRIPTION AND OPERATION
The outside mirror switch controls the power fold/unfold functions of the outside rearview mirrors. The folding mirror motors are controlled by using bi-directional motor controls through the folding mirror motor fold control circuit and the folding mirror motor unfold control circuit.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
The mirror select and fold/unfold switches are inputs to the mirror control module which communicates with the memory seat module through a serial data circuit. When the memory seat module receives a fold/unfold signal from the mirror control module, the memory seat control module will send a fold or unfold command back to the left mirror control module and passenger window switch. The mirror control module and passenger window switch control the fold/unfold motors through bi-directional control circuits.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
The outside rearview mirror switch is a multiplex switch which signals the left mirror control module which outside rearview mirror to move (driver or passenger) and which direction to move it. The left mirror control module and the passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the left mirror control module. When the memory seat module receives the switch inputs from the left mirror control module, mirror output commands are sent to the appropriate module/switch through the serial data circuit. The left mirror control module and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The left mirror control module and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the left mirror control module and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
The outside rearview mirror switch controls the outside rearview mirrors based on the position of the mirror selector switch and which movement position is selected. The outside rearview mirror switch has four positions: up, down, left, and right. B+ is applied to the switch from the power mirror fuse and when a movement position switch is selected, voltage is sent to the commanded mirror via a mirror control circuit. The opposite mirror control circuit acts as a ground circuit for the bi-directional mirror motor. Ground is the applied through the switch.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB) or OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
The switch for exterior mirrors and the passenger's window switch are in a serial data circuit with memory seat module as master. The switches for mirror selection and directional control give input signals to the memory seat module through the serial data circuit. When the memory seat module receives switch input signals from the switch for exterior door mirrors, outgoing mirror commands are sent to the appropriate switch through the serial data circuit. The switch for the exterior door mirrors and passenger window switch controls the left and right exterior door mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The switch for the exterior mirrors and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the switch and the exterior door mirrors and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITHOUT AAB)
OUTSIDE MIRROR DESCRIPTION AND OPERATION (WITH AAB)
SYMPTOM DESCRIPTION
The suction holders that are used in assembly shop might leave these ring marks that are hard to clean away.