Seat System: Other Chevrolet Silverado 1500 HD

Driver Seat Module

Battery Voltage: The scan tool displays the voltage level of the battery voltage supply circuit to the memory seat module.

Horizontal Motor Forward: The scan tool displays Active or Inactive. Whenever the horizontal adjuster motor is commanded to move the seat forward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Horizontal Motor Rearward: The scan tool displays Active or Inactive. Whenever the horizontal adjuster motor is commanded to move the seat rearward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Recline Motor Forward: The scan tool displays Active or Inactive. Whenever the recline adjuster motor is commanded to move the seat back forward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Recline Motor Rearward: The scan tool displays Active or Inactive. Whenever the recline adjuster motor is commanded to move the seat back rearward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Lumbar Motor Forward: The scan tool displays Active or Inactive. Whenever the lumbar adjuster motor is commanded to move the lumbar support forward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Lumbar Motor Rearward: The scan tool displays Active or Inactive. Whenever the lumbar adjuster motor is commanded to move the lumbar support rearward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Rear Vertical Motor Upward: The scan tool displays Active or Inactive. Whenever the rear vertical adjuster motor is commanded to move the rear of the seat upward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Rear Vertical Motor Downward: The scan tool displays Active or Inactive. Whenever the rear vertical adjuster motor is commanded to move the rear of the seat downward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Front Vertical Motor Upward: The scan tool displays Active or Inactive. Whenever the front vertical adjuster motor is commanded to move the front of the seat upward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Front Vertical Motor Downward: The scan tool displays Active or Inactive. Whenever the front vertical adjuster motor is commanded to move the front of the seat downward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Torso Motor Inward: The scan tool displays Active or Inactive. Whenever the torso adjuster motor is commanded to move the torso bolster inward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Torso Motor Outward: The scan tool displays Active or Inactive. Whenever the torso adjuster motor is commanded to move the torso bolster outward, due to a manual switch input or a memory recall function, the scan tool displays Active.

Lumbar Forward Switch: The scan tool displays Active or Inactive. When the lumbar switch is operated in the forward direction the scan tool displays Active.

Lumbar Rearward Switch: The scan tool displays Active or Inactive. When the lumbar switch is operated in the rearward direction the scan tool displays Active.

Torso Inward Switch: The scan tool displays Active or Inactive. When the torso switch is operated in the inward direction the scan tool displays Active.

Torso Outward Switch: The scan tool displays Active or Inactive. When the torso switch is operated in the outward direction the scan tool displays Active.

Recline Forward Switch: The scan tool displays Active or Inactive. When the recline switch is operated in the forward direction the scan tool displays Active.

Recline Rearward Switch: The scan tool displays Active or Inactive. When the recline switch is operated in the rearward direction the scan tool displays Active.

Horizontal Forward Switch: The scan tool displays Active or Inactive. When the horizontal seat adjuster switch is operated in the forward direction the scan tool displays Active.

Horizontal Rearward Switch: The scan tool displays Active or Inactive. When the horizontal seat adjuster switch is operated in the rearward direction the scan tool displays Active.

Rear Vertical Upward Switch: The scan tool displays Active or Inactive. When the rear vertical adjuster switch is operated in the upward direction the scan tool displays Active.

Rear Vertical Downward Switch: The scan tool displays Active or Inactive. When the rear vertical adjuster switch is operated in the downward direction the scan tool displays Active.

Front Vertical Upward Switch: The scan tool displays Active or Inactive. When the front vertical adjuster switch is operated in the upward direction the scan tool displays Active.

Front vertical Downward Switch: The scan tool displays Active or Inactive. When the front vertical adjuster switch is operated in the downward direction the scan tool displays Active.

Driver Heated Seat Status: The scan tool displays Off, High, Med, or Low depending on the current heat level operating mode.

Passenger Heated Seat Status: The scan tool displays Off, High, Med, or Low depending on the current heat level operating mode.

Driver Seat Heat Zone: The scan tool displays Off, Back Only, or Back and Cushion depending on the current heat zone operating mode.

Psgr. Seat Heat Zone: The scan tool displays Off, Back Only, or Back and cushion depending on the current heat zone operating mode.

Front Vertical Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the front vertical seat position sensor.

Rear Vertical Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the rear vertical seat position sensor.

Horizontal Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the horizontal seat position sensor.

Torso Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the torso bolster position sensor.

Horizontal Lumbar Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the lumbar support position sensor.

Vertical Lumbar Position: The scan tool displays 0 to 255 counts. The counts displayed are calculated by the memory seat module using the signal circuit input from the lumbar support position sensor.

Recline Position: The scan tool displays 0.0 to 5.0 volts. The voltage displayed is an input to the memory seat module from the recline position sensor.

Drvr. Seat Heat Sensor: The scan tool displays 0.0 to 5.0 volts. The voltage displayed is an input to the memory seat module from the driver seat heat sensor.

Psgr. Seat Heat Sensor: The scan tool displays 0.0 to 5.0 volts. The voltage displayed is an input to the memory seat module from the passenger seat heat sensor.

Mem 1 Front Vertical Value: The scan tool displays 0 to 255 counts. The value displayed is the front vertical seat position sensor counts stored by the memory seat module as the memory 1 position setting.

Mem 2 Front Vertical Value: The scan tool displays 0 to 255 counts. The value displayed is the front vertical seat position sensor counts stored by the memory seat module as the memory 2 position setting.

Mem 1 Horizontal Value: The scan tool displays 0 to 255 counts. The value displayed is the horizontal seat position sensor counts stored by the memory seat module as the memory 1 position setting.

Mem 2 Horizontal Value: The scan tool displays 0 to 255 counts. The value displayed is the horizontal seat position sensor counts stored by the memory seat module as the memory 2 position setting.

Mem 1 Rear Vertical Value: The scan tool displays 0 to 255 counts. The value displayed is the rear vertical seat position sensor counts stored by the memory seat module as the memory 1 position setting.

Mem 2 Rear Vertical Value: The scan tool displays 0 to 255 counts. The value displayed is the rear vertical seat position sensor counts stored by the memory seat module as the memory 2 position setting.

Mem 1 Recline Value: The scan tool displays 0.0 to 5.0 volts. The value displayed is the recline position sensor signal voltage stored by the memory seat module as the memory 1 position setting.

Mem 2 Recline Value: The scan tool displays 0.0 to 5.0 volts. The value displayed is the recline position sensor signal voltage stored by the memory seat module as the memory 2 position setting.

Software Part Number: The scan tool displays the software identification number in the memory seat module.

Software Design Suffix: The scan tool displays the version of the software part number in the memory seat module.

Driver Door Module

Heated Seat Mode: The scan tool displays Off, High, Med, or Low depending on the current heat level operating mode.

Heat Indicator Low: The scan tool displays Active or Inactive. The scan tool displays the current status of the low heat operating mode determined by the heated seat switch signal circuit inputs to the driver door module.

Heat Indicator Medium: The scan tool displays Active or Inactive. The scan tool displays the current status of the medium heat operating mode determined by the heated seat switch signal circuit inputs to the driver door module.

Heat Indicator High: The scan tool displays Active or Inactive. The scan tool displays the current status of the high heat operating mode determined by the heated seat switch signal circuit inputs to the driver door module.

Back Only Heat Indicator: The scan tool displays Active or Inactive. The scan tool displays the current status of the heated seat back only operating mode determined by the heated seat switch signal circuit inputs to the driver door module.

Back only Heat Mode: The scan tool displays Active or Inactive. Whenever the heated seat back only operating mode is commanded on by the driver door module the scan tool displays Active.

Memory Switch: The scan tool displays Memory 1, Memory 2, Exit, or Idle. The scan tool displays the current memory switch status determined by the memory 1 and memory 2 signal circuit inputs to the driver door module.

Heat Indicator Low: The scan tool displays Active or Inactive. Whenever the low heat indicator is commanded on by the driver door module the scan tool displays Active.

Heat Indicator Medium: The scan tool displays Active or Inactive. Whenever the medium heat indicator is commanded on by the driver door module the scan tool displays Active.

Heat Indicator High: The scan tool displays Active or Inactive. Whenever the high heat indicator is commanded on by the driver door module the scan tool displays Active.

Back Only Heat Indicator: The scan tool displays Active or Inactive. Whenever the heated seat back only indicator is commanded on by the driver door module the scan tool displays Active.

Passenger Door Module

Heated Seat Mode: The scan tool displays Off, High, Med, or Low depending on the current heat level operating mode.

Heat Indicator Low: The scan tool displays Active or Inactive. The scan tool displays the current status of the low heat operating mode determined by the heated seat switch signal circuit inputs to the passenger door module.

Heat Indicator Medium: The scan tool displays Active or Inactive. The scan tool displays the current status of the medium heat operating mode determined by the heated seat switch signal circuit inputs to the passenger door module.

Heat Indicator High: The scan tool displays Active or Inactive. The scan tool displays the current status of the high heat operating mode determined by the heated seat switch signal circuit inputs to the passenger door module.

Back Only Heat Indicator: The scan tool displays Active or Inactive. The scan tool displays the current status of the heated seat back only operating mode determined by the heated seat switch signal circuit inputs to the passenger door module.

Back Only Heat Mode: The scan tool displays Active or Inactive. Whenever the heated seat back only operating mode is commanded on by the passenger door module the scan tool displays Active.

Memory Switch: The scan tool displays Memory 1, Memory 2, Exit, or Idle. The scan tool displays the current memory switch status determined by the memory 1 and memory 2 signal circuit inputs to the passenger door module.

Heat Indicator Low: The scan tool displays Active or Inactive. Whenever the low heat indicator is commanded on by the passenger door module the scan tool displays Active.

Heat Indicator Medium: The scan tool displays Active or Inactive. Whenever the medium heat indicator is commanded on by the passenger door module the scan tool displays Active.

Heat Indicator High: The scan tool displays Active or Inactive. Whenever the high heat indicator is commanded on by the passenger door module the scan tool displays Active.

Back Only Heat Indicator: The scan tool displays Active or Inactive. Whenever the heated seat back only indicator is commanded on by the passenger door module the scan tool displays Active.

Scheme 194

Scheme 195

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Tools Required

J 34940 Rivet Gun

Scheme 196

Scheme 197

1. Remove the front seat from the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .
2. Remove the head restraint and guides. Refer to «Head Restraint Replacement»(ref-189025-S08533823502005091100000) .
3. Remove the seat back cover and pad. Refer to «Seat Back Cover And Pad Replacement-Front»(ref-189025-S28228645972005091100000) .
4. Drill out the rivet holes on the bolster paddles (1).
5. Detach the lumbar clip from the top of the seat frame.
6. Remove the lumbar wire from the bottom of the seat frame.
7. Disconnect the electrical connectors to the motors.
8. Remove the power lumbar/bolster assembly from the seat.

Scheme 198

Scheme 199

1. Position the power lumbar/bolster assembly on the seat.
2. Connect the electrical connectors to the motors.
3. Fasten the lumbar wire at the bottom of the frame.
4. Attach the lumbar clip onto the top of the seat frame.
5. Install the rivets to secure the bolster paddles (1).
6. Install the seat back cover and pad. Refer to «Seat Back Cover And Pad Replacement-Front»(ref-189025-S28228645972005091100000) .
7. Install the head restraint and guides. Refer to «Head Restraint Replacement»(ref-189025-S08533823502005091100000) .
8. Install the seat in the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .

Scheme 200

1. Remove the power seat switch bezel containing the lumbar switch (1) from the seat. Refer to «Seat Switch Bezel Replacement»(ref-189025-S11841673512005091100000) .
2. Remove the lumbar switch screws from the power seat switch bezel.
3. Remove the lumbar switch.

Scheme 201

1. Install the lumbar switch to the power seat switch bezel. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
2. Install the lumbar switch screws. Tighten Tighten the screws to 2 N.m (18 lb in).
3. Install the power seat switch bezel (1) to the seat. Refer to «Seat Switch Bezel Replacement»(ref-189025-S11841673512005091100000) .

Scheme 202

Scheme 203

1. Remove the front seat from the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .
2. Remove the seat trim panel. Refer to «Trim Panel Replacement-Front Seat»(ref-189025-S34851114962005091100000) .
3. Remove the seat cushion frame. Refer to «Seat Cushion Frame Replacement-Front»(ref-189025-S18600699982005091100000) .
4. Remove the seat back frame. Refer to «Seat Back Frame Replacement-Front»(ref-189025-S21427474592005091100000) .
5. Remove the seat back hinge/Recliner Mechanism. Refer to «Seat Back Hinge/Recliner Mechanism Replace-Front»(ref-189025-S01802115612005091100000) .
6. Remove the seat adjuster track cover. Refer to «Seat Adjuster Track Cover Replacement-Front»(ref-189025-S28061233852005091100000) .
7. Remove the inboard seat belt buckle and nut (1). Disconnect the electrical connection (2).
8. Remove the bar (1) from the adjuster tracks (2). Straighten the tabs in order to remove the bar.
9. Remove the cross brace (3).
10. Remove the EZ entry rod (4), if equipped with the EZ entry feature.
11. Remove the cushion tilt mechanism, if equipped.

Scheme 204

Scheme 205

1. Install the cushion tilt mechanism, if equipped.
2. Install the EZ entry rod (4), if equipped with the EZ entry feature.
3. Install the cross brace (3).
4. Install the bar (1) onto the racks (2). Bend the tabs in order to secure the bar. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
5. Install the inboard seat belt buckle and nut (1). Tighten Tighten the nut to 53 N.m (39 lb ft).
6. Connect the electrical connection (2).
7. Install the seat adjuster track cover. Refer to «Seat Adjuster Track Cover Replacement-Front»(ref-189025-S28061233852005091100000) .
8. Install the seat back hinge/recliner mechanism. Refer to «Seat Back Hinge/Recliner Mechanism Replace-Front»(ref-189025-S01802115612005091100000) .
9. Install the seat back frame. Refer to «Seat Back Frame Replacement-Front»(ref-189025-S21427474592005091100000) .
10. Install the seat cushion frame. Refer to «Seat Cushion Frame Replacement-Front»(ref-189025-S18600699982005091100000) .
11. Install the seat trim panel. Refer to «Trim Panel Replacement-Front Seat»(ref-189025-S34851114962005091100000) .
12. Install the front seat in the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .

Scheme 206

1. Remove the front seat from the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .
2. Remove the seat trim panel. Refer to «Trim Panel Replacement-Front Seat»(ref-189025-S34851114962005091100000) .
3. Remove the seat cushion frame from the seat adjuster. Refer to «Seat Cushion Frame Replacement-Front»(ref-189025-S18600699982005091100000) .
4. Remove the inboard seat belt buckle and nut (1). Disconnect the electrical connection (2).
5. Remove the seat back frame from the seat adjuster. Refer to «Seat Back Frame Replacement-Front»(ref-189025-S21427474592005091100000) .
6. Remove the seat back hinge/recliner mechanism. Refer to «Seat Back Hinge/Recliner Mechanism Replace-Front»(ref-189025-S01802115612005091100000) .
7. Remove the seat adjuster track cover. Refer to «Seat Adjuster Track Cover Replacement-Front»(ref-189025-S28061233852005091100000) .
8. Remove the memory module, if equipped. Refer to «Memory Seat Control Module Replacement»(ref-189025-S21889700332005091100000) .

Scheme 207

1. Install the memory module, if equipped. Refer to «Memory Seat Control Module Replacement»(ref-189025-S21889700332005091100000) . NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
2. Install the inboard seat belt buckle and nut (1). Tighten Tighten the nut to 53 N.m (39 lb ft).
3. Connect the electrical connection (2).
4. Install the seat adjuster track cover. Refer to «Seat Adjuster Track Cover Replacement-Front»(ref-189025-S28061233852005091100000) .
5. Install the seat back hinge/recliner mechanism. Refer to «Seat Back Hinge/Recliner Mechanism Replace-Front»(ref-189025-S01802115612005091100000) .
6. Install the seat back frame to the seat adjuster. Refer to «Seat Back Frame Replacement-Front»(ref-189025-S21427474592005091100000) .
7. Install the seat cushion frame to the seat adjuster. Refer to «Seat Cushion Frame Replacement-Front»(ref-189025-S18600699982005091100000) .
8. Install the seat trim panel. Refer to «Trim Panel Replacement-Front Seat»(ref-189025-S34851114962005091100000) .
9. Install the seat in the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .

Scheme 208

1. Remove the seat from the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .
2. Unsnap the front tabs, then the rear tabs of the track cover.
3. Remove the track cover from the vehicle.

Scheme 209

1. Install the track cover on the seat.
2. Snap on the rear tabs, then the front tabs of the track cover.
3. Install the seat in the vehicle. Refer to «Seat Replacement-Front Bucket»(ref-189025-S15619115982005091100000) .

Lumbar Support/Torso Bolster System Components

The lumbar support/torso bolster system for the driver and passenger consists of the following components

1. Driver and passenger lumbar support/torso bolster switches.
2. Driver and passenger lumbar support/torso bolster motor assemblies
3. Driver seat module
4. Memory select switch
5. Driver door module
6. SEAT 30A circuit breaker

Heated Seat Components

The heated seat system consists of the following components

1. Driver and passenger heated seat switches
2. Driver and passenger seat back heater elements
3. Driver and passenger seat cushion heater elements
4. Driver and passenger seat back temperature sensors
5. Driver seat module
6. Driver door module
7. Passenger door module

The driver and passenger heated seats are controlled by the driver seat module using inputs from the heated seat switches and the seat back temperature sensors and will operate only while the engine is running. The heated seat switches are inputs to the driver and passenger door modules which provide the heated seat switch information to the driver seat module through Class 2 serial data circuit messages. The heated seat operating mode off, high, medium, or low is determined by the number of times the heated seat switch is pressed. Pressing the heated seat switch 1 time will activate the seat back and cushion heater elements in the high mode, and each time the switch is pressed during an ignition cycle the seat back and cushion heat level is reduced from high to medium, low, and off.

The heated seat switches are momentary contact type switches and are supplied with battery voltage from the door modules. When a heated seat switch is pressed and released a brief switch signal voltage is supplied to the door module. Whenever the door module receives an active heated seat switch input, the next heated seat operating mode is determined by whatever the current mode may be. The driver and passenger seat heater elements are controlled by the driver seat module. When activating any of the heated seat operating modes, the seat module switches battery voltage to the heater element supply circuits. All of the seat heater elements are grounded by the driver seat module through individual low side drive control circuits. The heater element low side control circuits are pulse width modulated to ground by the driver seat module and are used to control the seat temperatures by regulating the current flow through the heater elements. The driver seat module relies on inputs from thermistors installed in the driver and passenger seat backs in order to regulate the heated seat temperatures. The thermistors are 2 wire sensors supplied with a 5-volt referenced signal circuit and a low reference circuit from the driver seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to increase as the seat back temperatures rise. The driver seat module will allow heated seat operation only while the engine is running which is determined by a Class 2 serial data circuit message from the powertrain control module.

The memory seat system consists of the following components

1. Power seat switch assembly
2. Memory recall switch assembly
3. Horizontal adjuster motor
4. Front vertical adjuster motor
5. Rear vertical adjuster motor
6. Recline adjuster motor
7. Driver seat module
8. Driver door module
9. SEAT 30A circuit breaker

Battery voltage is supplied to the driver seat module through the power seat circuit breaker. The driver seat module supplies the seat adjuster switch assembly with a battery positive reference voltage. While the seat adjuster switches are in an inactive state the switch contacts are closed to the adjuster switch ground circuit. When a seat adjuster switch is pressed to an active state the switch contact is closed to the reference voltage circuit. Battery voltage on a switch signal circuit indicates to the driver seat module the switch status is active. Each seat adjuster motor is controlled by the driver seat module through 2 motor control circuits. While the seat adjuster motors are in an inactive state the motor control circuits are closed to ground circuit contacts within the driver seat module. The driver seat module operates the seat adjuster motors by switching one of a motor's control circuits to battery voltage. The seat adjuster motors are bidirectional and the direction of adjuster motor rotation is determined by which of the adjuster motor control circuits is switched to battery voltage while the other remains grounded.