Component Description
Fig.2 Power Seat Switch Location:
DRIVER SEAT SWITCH
Vehicles equipped with power seats utilize a eightway power seat switch. This eight-way power seat switch features two knobs ganged together on the outboard seat cushion side shield.
The switch is secured to the back of the seat cushion side shield with two screws. However, the control knobs for the seat switch unit must be removed before the seat switch can be removed from the side shield.
The power seat switch cannot be repaired. If one switch is damaged or faulty, the entire power seat switch unit must be replaced.
When a power seat switch control knob or knobs are actuated, a battery feed and a ground path are applied through the switch contacts to the power seat track or recliner adjuster motor. The selected adjuster motor operates to move the seat track or recliner through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker must not be allowed to continue, or the motor may be damaged. See the owner's manual in the vehicle glove box for more information on the power seat switch functions and the seat adjusting procedures.
Fig.5 Memory Switch Location:
MEMORY SET SWITCH
Vehicles equipped with the memory system have a memory switch mounted to the driver side front door trim panel. This switch is used to set and recall all of the memory system settings for up to two drivers. The memory switch is a resistor multiplexed unit that is hard wired to the Body Control Module (BCM). The BCM sends out the memory system set and recall requests to the other electronic modules over the Programmable Communications Interface (PCI) data bus.
The memory switch cannot be adjusted or repaired and, if faulty or damaged, it must be replaced. For complete circuit diagrams, refer to Wiring Diagrams.
The memory switch has three momentary switch buttons labeled Set, 1 and 2. The Driver 1 and Driver 2 buttons are back-lit with Light-Emitting Diodes (LED) for visibility. When the memory set switch is depressed, a resistance value is sent to the Body Control Module via hard wired connections. When the memory system is in "set" mode a chime will be generated by the body control module.
See the owner's manual in the vehicle glove box for more information on the features, use and operation of the memory switch.
PASSENGER SEAT SWITCH
Vehicles equipped with power seats utilize a tenway power seat switch. This ten-way power seat switch features two knobs ganged together on the outboard seat cushion side shield.
The switch is secured to the back of the seat cushion side shield with two screws. However, the control knobs for the seat switch unit must be removed before the seat switch can be removed from the side shield.
The power seat switch cannot be repaired. If one switch is damaged or faulty, the entire power seat switch unit must be replaced.
When a power seat switch control knob or knobs are actuated, a battery feed and a ground path are applied through the switch contacts to the power seat track or recliner adjuster motor. The selected adjuster motor operates to move the seat track or recliner through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker must not be allowed to continue, or the motor may be damaged. See the owner's manual in the vehicle glove box for more information on the power seat switch functions and the seat adjusting procedures.
MEMORY MIRROR/SEAT MODULE
Vehicles equipped with the memory mirror/seat option, utilize a memory module located under the drivers front seat. This module is basically wired inline between the power seat switch and the power seat track/adjuster motors, or in-line between the power mirror switch and the power side view mirror. The MSMM contains a central processing unit that communicates with other modules on the Programmable Communications Interface (PCI) data bus network.
The Memory Seat/Mirror Module (MSMM) receives hard wired inputs from the driver power seat switch and the potentiometers on each of the driver side power seat track motors, or from the power mirror switch and the potentiometers on the side view mirror. The MSMM receives messages over the PCI data bus from the Body Control Module (BCM) (memory switch status), the Powertrain Control Module (PCM) (vehicle speed status). The MSMM will prevent the seat memory recall function from being initiated if the driver side seat belt is buckled, if the transmission gear selector lever is not in the Park or Neutral positions, or if the vehicle is moving.
For diagnosis of the MSMM or the PCI data bus, a DRB III scan tool and the proper Diagnostic Procedures manual are recommended. The MSMM cannot be repaired and, if faulty or damaged, it must be replaced. Refer to Memory System in the Power Seat or Power Mirror section of this manual for more information on the memory system option.
When memory system operation is requested (depressing of the memory switch), a resistor multiplexed signal is sent from the memory switch to the body control module (BCM). The body control module will then send the appropriate signals out to the memory/mirror seat module, the memory/mirror seat module then applies the voltage supply to the power seat track or side-view mirror if the proper requirements are met. The vehicle speed must equal zero and the transmission must be in park or neutral in order for the memory system to function.
DRIVER POWER SEAT TRACK
The eight-way power seat option includes a electrically operated power seat track located under each front seat. The left side power seat track also provides the mounting location for the body control module on this vehicle. The power seat circuit breakers are mounted on the rear of each power seat track, just behind the seat rear trim panel. The lower half of the power seat track is secured to the floor panel via four studs and nuts that must be accessed from the underside of the vehicle. Four bolts secure the bottom of the seat cushion pan to the upper half of the power seat track unit. Four additional bolts secure the seat back frame to the power seat track unit.
The power seat track unit includes four reversible electric motors that are secured to the upper half of the track unit. Each motor moves the seat adjuster through a combination of worm-drive gearboxes and screw-type drive units. Each of the four power seat track motors used on models equipped with the optional memory system incorporates a position potentiometer integral to the motor assembly which electronically monitors the motor position. This enables the memory system to function by referencing the motor positions programmed into the memory seat/mirror module.
The front and rear of the seat are operated by two separate vertical adjustment motors. These motors can be operated independently of each other, tilting the entire seat assembly forward or rearward; or, they can be operated in unison by selecting the proper power seat switch functions, which will raise or lower the entire seat assembly. A third motor is the horizontal adjustment motor, which moves the seat track in the forward and rearward directions. The forth motor is the recliner adjustment motor, which moves the seat back in the forward and rearward directions.
The power seat track unit cannot be repaired, and is serviced only as a complete unit. If any component in this unit is faulty or damaged, the entire power seat track unit must be replaced.
When a power seat switch control knob or knobs are actuated, a battery feed and a ground path are applied through the switch contacts to the power seat track or recliner adjuster motor. The selected adjuster motor operates to move the seat track or recliner through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker must not be allowed to continue, or the motor may be damaged.
See the owner's manual in the vehicle glove box for more information on the power seat switch functions and the seat adjusting procedures.
PASSENGER POWER SEAT TRACK
The eight-way power seat option includes a electrically operated power seat track unit located under each front seat. The power seat circuit breaker is mounted on the rear of the power seat track, just behind the seat rear trim panel. The lower half of the power seat track is secured to the floor panel via four studs and nuts that must be accessed from the underside of the vehicle. Four bolts secure the bottom of the seat cushion frame to the upper half of the power seat track unit. Four additional bolts secure the seat back frame to the power seat track unit.
The power seat track unit includes four reversible electric motors that are secured to the upper half of the track unit. Each motor moves the seat adjuster through a combination of worm-drive gearboxes and screw-type drive units.
The front and rear of the seat are operated by two separate vertical adjustment motors. These motors can be operated independently of each other, tilting the entire seat assembly forward or rearward; or, they can be operated in unison by selecting the proper power seat switch functions, which will raise or lower the entire seat assembly. A third motor is the horizontal adjustment motor, which moves the seat track in the forward and rearward directions. The forth motor is the recliner adjustment motor, which moves the seat back in the forward and rearward directions.
The power seat track unit cannot be repaired, and is serviced only as a complete unit. If any component in this unit is faulty or damaged, the entire power seat track unit must be replaced.
When a power seat switch control knob or knobs are actuated, a battery feed and a ground path are applied through the switch contacts to the power seat track or recliner adjuster motor. The selected adjuster motor operates to move the seat track or recliner through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker must not be allowed to continue, or the motor may be damaged.
See the owner's manual in the vehicle glove box for more information on the power seat switch functions and the seat adjusting procedures.