Seat System Cadillac STS I

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

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Scheme 6

Scheme 7

Scheme 8

Scheme 9

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Scheme 13

Scheme 14

Scheme 15

Climate Control Seat Module - Passenger C1 Connector End (w/KA1/KB6) Connector Part Information OEM: 12052856 Service: 4-Way F Metri-Pack 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-BU 2479 Passenger Heated Seat Element Supply Voltage B RD/WH 2540 Battery Positive Voltage C - - Not Used D PK 2077 Driver Heated Seat Element Supply Voltage

Climate Control Seat Module - Passenger C2 Connector End (w/KA1/KB6) Connector Part Information OEM: 15-97-5121 Service: 12-Way F Mini Fit Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1-2 - - Not Used 3 BN 41 Run Ignition 3 Voltage 4 - - Not Used 5 PK 2435 Passenger Heated Seat NTC Low Reference 6 BK 650 Ground 7 GY 791 PWM Serial Data 8 WH 790 PWM Serial Data 9 WH 5915 Passenger Seat Fan Speed Control (KB6) 10 YE/BK 2079 Driver Heated Seat NTC Signal 11 GY 2434 Passenger Heated Seat NTC Signal 12 OG 5919 Driver Seat Fan Speed Control (KB6)

Cooled Seat Blower Motor - Driver Back Connector End (w/KB6) Connector Part Information OEM: 12065423 Service: 3-Way M Metri-Pack 150 Series (WH) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-BU 5919 Driver Seat Fan Speed Control B BK 550 Ground C RD/WH 2840 Battery Positive Voltage

Cooled Seat Blower Motor - Driver Cushion Connector End (w/KB6) Connector Part Information OEM: 12065423 Service: 3-Way M Metri-Pack 150 Series (WH) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-BU 5919 Driver Seat Fan Speed Control B BK 550 Ground C RD/WH 2840 Battery Positive Voltage

Cooled Seat Blower Motor- Passenger Back Connector End (w/KB6) Connector Part Information OEM: 12065423 Service: 3-Way M Metri-Pack 150 Series (WH) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A WH 5915 Driver Seat Fan Speed Control B BK 650 Ground C RD/WH 2540 Battery Positive Voltage

Cooled Seat Blower Motor - Passenger Cushion Connector End (w/KB6) Connector Part Information OEM: 12065423 Service: 3-Way M Metri-Pack 150 Series (WH) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A WH 5915 Driver Seat Fan Speed Control B BK 650 Ground C RD/WH 2540 Battery Positive Voltage

Heated Seat Element - Driver Back Connector End (w/KA1) Connector Part Information OEM: 12059254 Service: 2-Way M Metri-Pack 150 Series (GN) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A PK 2077 Driver Heated Seat Element Supply Voltage B BK 550 Ground

Heated Seat Element - Driver Cushion Connector End (w/KA1) Connector Part Information OEM: 12047786 Service: 4-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A PK 2077 Driver Heated Seat Element Supply Voltage B BK 550 Ground C YE/BK 2079 Driver Heated Seat NTC Signal D YE 2080 Driver Heated Seat NTC Low Reference

Heated Seat Element - LR Back Connector End (w/KA6) Connector Part Information OEM: 12047663 Service: 2-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-GN 9174 LR Heated Seat Supply Voltage B L-GN 9175 LR Heated Seat Element Control

Heated Seat Element - LR Cushion Connector End (w/KA6) Connector Part Information OEM: 12047786 Service: 12085536 4-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-GN 9174 LR Heated Seat Element Supply Voltage B L-GN 9175 LR Heated Seat Element Control C L-BU 9171 LR Heated Seat Temperature Sensor Signal D D-BU 9170 LR Heated Seat Temperature Sensor Low Reference

Heated Seat Element - Passenger Back Connector End (w/KA1) Connector Part Information OEM: 12059254 Service: 2-Way M Metri-Pack 150 Series (GN) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-BU 2479 Passenger Heated Seat Element Supply Voltage B BK 650 Ground

Heated Seat Element - Passenger Cushion Connector End (w/KA1) Connector Part Information OEM: 12047786 Service: 4-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-BU 2479 Passenger Heated Seat Element Supply Voltage B BK 650 Ground C GY 2434 Passenger Heated Seat NTC Signal D PK 2435 Passenger Heated Seat NTC Low Reference

Heated Seat Element - RR Back Connector End (w/KA6) Connector Part Information OEM: 12048457 Service: 2-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A GY 9173 RR Heated Seat Element Supply Voltage B BN 9172 RR Heated Seat Element Control

Heated Seat Element - RR Cushion Connector End (w/KA6) Connector Part Information OEM: 12047786 Service: 12085536 4-Way M Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A GY 9173 RR Heated Seat Element Supply Voltage B BN 9172 RR Heated Seat Element Control C OG 9176 RR Heated Seat Temperature Sensor Signal D PK 9177 RR Heated Seat Temperature Sensor Low Reference

Heated Seat Module - Rear C1 Connector End (KA6) Connector Part Information OEM: 39-01-2120 Service: 12-Way F Mini Fit Molex (CL) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 - - Not Used 2 PK 9177 RR Heated Seat Temperature Sensor Low Reference 3 - - Not Used 4 L-BU 9171 LR Heated Seat Temperature Sensor Signal 5 D-GN 9174 LR Heated Seat Element Supply Voltage 6 GY 9173 RR Heated Seat Element Supply Voltage 7-8 - - Not Used 9 OG 9176 RR Heated Seat Temperature Sensor Signal 10 - - Not Used 11 L-GN 9175 LR Heated Seat Element Control 12 BN 9172 RR Heated Seat Element Control

Heated Seat Module - Rear C2 Connector End (KA6) Connector Part Information OEM: 12052856 Service: 4-Way F Metri-Pack 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A BK 850 Ground B YE 182 Rear Heated Seat Switch Supply Voltage C BN 341 Ignition 3 Voltage D - - Not Used

Heated Seat Module - Rear C3 Connector End (KA6) Connector Part Information OEM: 39-01-2100 Service: 10-Way F Mini Fit Molex (CL) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1-2 - - Not Used 3 TN/WH 6585 LR Medium Temperature Indicator 4 BN 1634 RR Heated Seat Switch Signal 5 BN/WH 1637 LR Heated Seat Switch Signal 6 PK 1636 RR Low Temperature Indicator 7 L-BU/WH 6586 RR Medium Temperature Indicator 8 BK/WH 1635 RR High Temperature Indicator 9 BK/WH 1638 LR High Temperature Signal 10 PK 1631 LR Low Temperature Indicator

Lumbar Adjuster Switch - Driver Connector End (w/AL2) Connector Part Information OEM: 12052854 Service: 88953358 7-Way F Metri-Pack 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A YE/BK 1067 Driver Seat Lumbar Down Switch Signal B D-BU 1064 Driver Seat Lumbar Rearward Switch Signal C YE 1065 Driver Seat Lumbar Forward Switch Signal D-E - - Not Used F WH 1066 Driver Seat Lumbar Up Switch Signal G RD/WH 2840 Battery Positive Voltage

Lumbar Adjuster Switch - Passenger Connector End (w/AL2) Connector Part Information OEM: 12052854 Service: 88953358 7-Way F Metri-Pack 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A OG 792 Passenger Power Seat Lumbar Motor Down Control B D-BU 211 Passenger Power Seat Lumbar Motor Forward Control C WH 210 Passenger Power Seat Lumbar Motor Rearward Control D - - Not Used E BK 650 Ground F PK 793 Passenger Power Seat Lumbar Motor Up Control G RD/WH 3740 Battery Positive Voltage

Lumbar Motor Assembly - Driver - C1 Connector End (w/AL2) Connector Part Information OEM: 12129136 Service: 4-Way F Metri-Pack 280 Series, Flexlock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A TN 768 Memory Mirror Position Sensor 5-Volt Reference B L-GN 284 Driver Power Seat Horizontal Motor Rearward/Lumbar Down Control C D-BU 611 Driver Power Seat Lumbar Motor Forward Control D PK 610 Driver Power Seat Lumbar Motor Forward Control

Lumbar Motor Assembly - Driver - C2 Connector End (w/AL2) Connector Part Information OEM: 12047785 Service: 4-Way F Metri-Pack 150 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A TN 782 Memory Seat/Mirror Sensor Low Reference B TN 1062 Driver Memory Seat Lumbar Vertical Position Sensor Signal C GY 788 Memory Mirror Position Sensor 5-Volt Reference D YE 1063 Driver Memory Seat Lumbar Horizontal Position Sensor Signal

Lumbar Motor Assembly - Passenger Connector End (w/AL2) Connector Part Information OEM: 12129136 Service: 4-Way F Metri-Pack 280 Series, Flexlock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A PK 793 Passenger Power Seat Lumbar Motor Up Control B OG 792 Passenger Power Seat Lumbar Motor Down Control C D-BU 211 Passenger Power Seat Lumbar Motor Forward Control D WH 210 Passenger Power Seat Lumbar Motor Rearward Control

Memory Seat Module (MSM) - C1 Connector End (A45) Connector Part Information OEM: 12064749 Service: 2-Way F Metri-Pack 480 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A BK 550 Ground B RD/WH 3740 Battery Positive Voltage

Memory Seat Module (MSM) - C2 Connector End (A45) Connector Part Information OEM: 12129432 Service: 12129432 16-Way F Metri-Pack 280 Series, ACT (GY) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-GN 286 Driver Power Seat Front Vertical Motor Up Control B YE 282 Driver Power Seat Rear Vertical Motor Up Control C L-BU 283 Driver Power Seat Rear Vertical Motor Down Control D TN 768 Driver Power Seat Lumbar Motor Up Control (AL2) E PK 2111 Steering Column Tilt Motor Up Control F D-BU 611 Driver Power Seat Lumbar Motor Forward Control (AL2) G L-GN 276 Driver Power Seat Recline Motor Forward Control H L-BU 277 Driver Power Seat Recline Motor Rearward Control J TN 285 Driver Power Seat Horizontal Motor Forward Control K L-GN 284 Driver Power Seat Horizontal Motor Rearward Control L-M - - Not Used N PK 610 Driver Power Seat Lumbar Motor Rearward Control (AL2) P - - Not Used R OG 2098 Steering Column Telescope Motor Forward S D-BU 287 Driver Power Seat Front Vertical Motor Down Control

Memory Seat Module (MSM) - C3 Connector End (A45) Connector Part Information OEM: 174046-2 Service: 16-Way F 40 Series Multi Lock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 TN 568 Memory Seat Rear Vertical Motor Position Sensor Signal 2 BN/WH 557 Memory Seat Front Vertical Motor Position Sensor Signal 3 YE 1063 Memory Seat Lumbar Horizontal Position Sensor Signal (AL2) 4 WH/BK 570 Driver Memory Seat Recline Motor Position Sensor Signal 5 - - Not Used 6 GY 788 Memory Mirror Position Sensor 5-Volt Reference 7 RD/WH 2840 Battery Positive Voltage 8 - - Not Used 9 OG 2153 Steering Column Telescope Motor Signal 10 TN 1062 Memory Seat Lumbar Vertical Position Sensor Signal (AL2) 11 D-GN 569 Memory Seat Horizontal Motor Position Sensor Signal 12 - - Not Used 13 OG/WH 2154 Steering Column Tilt Motor Signal 14 TN 782 Memory Seat/Mirror Sensor Low Reference 15 BK/WH 551 Ground 16 - - Not Used

Memory Seat Module (MSM) - C4 Connector End (A45) Connector Part Information OEM: 174047-2 Service: 20-Way M Hinged Lock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 WH 790 PWM Serial Data 2 YE 1519 Power Seat Rear Vertical Up Switch Signal 3 L-BU 1521 Power Seat Rear Vertical Down Switch Signal 4 TN 1522 Power Seat Horizontal Forward Switch Signal 5 L-GN 1523 Power Seat Horizontal Rearward Switch Signal 6 L-BU 277 Driver Power Seat Recline Motor Rearward Control 7 L-GN 276 Driver Power Seat Recline Motor Forward Control 8 D-BU 1064 Driver Seat Lumbar Rearward Switch Signal 9 YE 1065 Driver Seat Lumbar Forward Switch Signal 10 YE/BK 1067 Driver Seat Lumbar Down Switch Signal 11 GY 791 PWM Serial Data 12-17 - - Not Used 18 D-GN 1518 Power Seat Front Vertical Up Switch Signal 19 D-BU 1520 Power Seat Front Vertical Down Switch Signal 20 WH 1066 Driver Seat Lumbar Up Switch Signal

Seat Adjuster Motor Assembly - Driver C1 Connector End (w/A45) Connector Part Information OEM: 7283-6466-40 Service: 6-Way F YESC 2.8MM (GY) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 YE 282 Driver Power Seat Rear Vertical Motor Up Control 2 D-GN 286 Driver Power Seat Front Vertical Motor Up Control 3 TN 285 Driver Power Seat Horizontal Motor Forward Control 4 L-BU 283 Driver Power Seat Rear Vertical Motor Down Control 5 D-BU 287 Driver Power Seat Front Vertical Motor Down Control 6 L-GN 284 Driver Power Seat Horizontal Motor Rearward Control

Seat Adjuster Motor Assembly - Driver C2 Connector End (w/A45) Connector Part Information OEM: 7283-5532-40 Service: 6-Way F 1.5 Series Yazaki (GY) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 BN/WH 557 Memory Seat front Vertical Motor Position Sensor Signal 2 TN 782 Memory Seat Sensor Low Reference 3 D-GN 569 Memory Seat Horizontal Motor Position Sensor Signal 4 - - Not Used 5 TN 568 Memory Seat Rear Vertical Motor Position Sensor Signal 6 GY 788 5-Volt Reference

Seat Adjuster Motor Assembly - Driver Connector End (w/o A45) Connector Part Information OEM: 7283-6466-40 Service: 6-Way F YESC 2.8MM (GY) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 YE 282 Driver Power Seat Rear Vertical Motor Up Control 2 D-GN 286 Driver Power Seat Front Vertical Motor Up Control 3 TN 285 Driver Power Seat Horizontal Motor Forward Control 4 L-BU 283 Driver Power Seat Rear Vertical Motor Down Control 5 D-BU 287 Driver Power Seat Front Vertical Motor Down Control 6 L-GN 284 Driver Power Seat Horizontal Motor Rearward Control

Seat Adjuster Motor Assembly - Passenger Connector End Connector Part Information OEM: 7283-6466-40 Service: 6-Way F YESC 2.8 MM (GY) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 YE 288 Passenger Power Seat Rear Vertical Motor Up Control 2 D-GN 297 Passenger Power Seat Front Vertical Motor Up Control 3 TN 296 Passenger Power Seat Horizontal Motor Forward Control 4 L-BU 289 Passenger Power Seat Rear Vertical Motor Down Control 5 D-BU 298 Passenger Power Seat Front Vertical Motor Down Control 6 L-GN 290 Passenger Power Seat Horizontal Motor Rearward Control

Seat Adjuster Switch - Driver Connector End (w/A45) Connector Part Information OEM: 15326931 Service: 15306309 10-Way F GT 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-BU 277 Driver Power Seat Recline Motor Rearward Control B - - Not Used C L-GN 1523 Power Seat Horizontal Rearward Switch Signal D TN 1522 Power Seat Horizontal Forward Switch Signal E RD/WH 2840 Battery Positive Voltage F L-GN 276 Driver Power Seat Recline Motor Forward Control G L-BU 1521 Power Seat Rear Vertical Down Switch Signal H YE 1519 Power Seat Rear Vertical Up Switch Signal J D-BU 1520 Power Seat Front Vertical Down Switch Signal K D-GN 1518 Power Seat Front Vertical Up Switch Signal

Seat Adjuster Switch - Driver Connector End (w/o A45) Connector Part Information OEM: 15326931 Service: 15306309 10-Way F GT 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-BU 277 Driver Power Seat Recline Motor Rearward Control B BK 550 Ground C L-GN 284 Driver Power Seat Horizontal Motor Rearward Control D TN 285 Driver Power Seat Horizontal Motor Forward Control E RD/WH 2840 Battery Positive Voltage F L-GN 276 Driver Power Seat Recline Motor Forward Control G L-BU 283 Driver Power Seat Rear Vertical Motor Down Control H YE 282 Driver Power Seat Rear Vertical Motor Up Control J D-BU 287 Driver Power Seat Front Vertical Motor Down Control K D-GN 286 Driver Power Seat Front Vertical Motor Up Control

Seat Adjuster Switch - Passenger Connector End Connector Part Information OEM: 15326931 Service: 15306309 10-Way F GT 280 Series (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A RD/WH 3740 Battery Positive Voltage B L-GN 290 Passenger Power Seat Horizontal Motor Rearward Control C TN 296 Passenger Power Seat Horizontal Motor Forward Control D BK 650 Ground E D-BU 77 Passenger Power Seat Recline Motor Rearward F D-BU 298 Passenger Power Seat Front Vertical Motor Down Control G D-GN 297 Passenger Power Seat Front Vertical Motor Up Control H L-BU 289 Passenger Power Seat Rear Vertical Motor Down Control J YE 288 Passenger Power Seat Rear Vertical Motor Up Control K D-GN 76 Passenger Power Seat Recline Motor Forward

Seat Recline Motor - Driver Connector End (w/o A45) Connector Part Information OEM: 12129081 Service: 12129081 2-Way F Metri-Pack 280 Series, Flexlock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-GN 276 Driver Power Seat Recline Motor Forward Control B L-BU 277 Driver Power Seat Recline Motor Rearward Control

Seat Recline Motor Assembly - Driver - C1 Connector End (w/A45) Connector Part Information OEM: 12129081 Service: 12129081 2-Way F Metri-Pack 280 Series, Flexlock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A L-GN 276 Driver Power Seat Recline Motor Forward Control B L-BU 277 Driver Power Seat Recline Motor Rearward Control

Seat Recline Motor - Passenger Connector End Connector Part Information OEM: 12129081 Service: 12129081 2-Way F Metri-Pack 280 Series, Flexlock (BK) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function A D-BU 77 Passenger Power Seat Recline Motor Rearward B D-GN 76 Passenger Power Seat Recline Motor Forward

Seat Recline Position Sensor- Driver - C2 Connector End (w/A45) Connector Part Information OEM: 39-01-4030 Service: 3-Way F Mini Fit (WH) Terminal Part Information Terminal: Terminal Seal: Release Tool: Core Crimp: Insulation Crimp: Test Probe: Pin Wire Color Circuit No. Function 1 TN 782 Memory Seat/Mirror Sensor Low Reference 2 WH/BK 570 Driver Seat Recline Motor Position Sensor Signal 3 GY 788 Memory Mirror Position Sensor 5-Volt Reference

Diagnostic Starting Point - Seats

Before you begin any diagnostic procedure, always review the system Description and Operation. Reviewing the Description and Operation will help you determine the correct diagnostic procedure when a malfunction exists. Reviewing the Description and Operation will also help you determine if the condition described by the customer is normal operation.

After reviewing the system description and operation, always begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system.
2. The ability of the control modules to communicate through the serial data circuit.
3. The identification of any stored diagnostic trouble codes and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Scan Tool Output Controls

Driver Position Module (DPM) Output Controls

Scan Tool Data List

Driver Position Module (DPM) Data List

Climate Control Panel (CCP) Data List

Circuit Description

Battery positive voltage is supplied to the memory seat module (MSM)/driver position module (DPM) from the seats circuit breaker located in the left rear fuse block. When commanded, this voltage is used by the MSM/DPM to power the seat motors through the motor control circuits. During memory recall functions and manual seat functions, the driven motor current is monitored through the motor control circuits by the MSM/DPM. When an overcurrent condition is detected, the MSM/DPM disables the seat motors in order to protect the internal MSM/DPM circuitry.

DTC Descriptor

This diagnostic procedure supports the following DTC

DTC B1335 Device Power 3 Circuit Range/Performance

Conditions for Running the DTC

The MSM/DPM monitors for overcurrent only when the seat motors are active.

Conditions for Setting the DTC

The MSM/DPM will set DTC B1335 when the measured current exceeds 81 amps for 100 milliseconds.

Action Taken When the DTC Sets

1. All memory recalls in progress are aborted.
2. The MSM/DPM will not respond to manual movements of the affected motor.

Conditions for Clearing the DTC

The MSM/DPM does not detect an overcurrent condition during seat movement.

Diagnostic Aids

The MSM is also known as the DPM for this vehicle.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2: This test determines which directional motor exhibits excessive current.
2. 3: This test determines if the suspect motor has an internal short to ground.
3. 9: This test verifies the repair.

DTC B1335

When the power seat switches are pressed they send a 12-volt signal to the memory seat module (MSM). The MSM then commands the driver seat to move in response to the switch signals.

DTC Descriptors

This diagnostic procedure supports the following DTCs

1. DTC B1735 LF Seat Front Up Switch Circuit
2. DTC B1740 LF Seat Front Down Switch Circuit
3. DTC B1745 LF Seat Rear Up Switch Circuit
4. DTC B1750 LF Seat Rear Down Switch Circuit
5. DTC B1755 LF Seat Assembly Forward Switch Circuit
6. DTC B1760 LF Seat Assembly Rearward Switch Circuit
7. DTC B1815 LF Seat Recline Forward Switch Circuit
8. DTC B1820 LF Seat Recline Rearward Switch Circuit
9. DTC B1830 LF Seat Lumbar Forward Switch Circuit
10. DTC B1835 LF Seat Lumbar Rearward Switch Circuit
11. DTC B1840 LF Seat Lumbar Up Switch Circuit
12. DTC B1845 LF Seat Lumbar Down Switch Circuit

The MSM must be powered and cannot have DTC B1327 - Battery Voltage Low as an active DTC for this DTC to set.

1. If a seat switch continues to be active for 30 seconds after a motor controlled by that switch reaches the end of its travel, the switch will be considered shorted and the MSM will set the DTC.
2. If a position sensor DTC is current and the associated switch is active for 30 continuous seconds, the switch will be considered shorted and the MSM will set a switch DTC.
3. A switch DTC will not set if DTC B1327 current.

1. A motor output driven in response to a switch considered failed, is deactivated for both directions.
2. All memory recall commands are ignored.
3. The MSM will respond to any other switch signal that has not set a DTC.

The DTC automatically clears when the switch circuit setting the DTC is no longer active.

The MSM is also known as the driver position module (DPM) for this vehicle.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: This step checks the existing state of the driver's seat switch by using the current state of the signal parameter. If all of the seat switch parameters display active, possibly one of the seat switch signal circuits is shorted to voltage.
2. 4: When the seat adjuster switch is disconnected, this step determines if the seat switch contacts are stuck closed, or if one of the switch signal circuits is possibly shorted to battery positive voltage.

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, B1820, B1830, B1835, B1840, B1845, B1940, or B1945

The potentiometer type position sensor that sets this DTC is an internal part of the seat directional motor. It receives a 5-volt reference and low reference from the memory seat module (MSM). The sensor sends a voltage signal that is pulled up to voltage by the MSM. This voltage signal varies with the movement of the seat. Then based on this voltage signal, the MSM determines the position of the seat.

This diagnostic procedure supports the following DTCs

1. DTC B1825 Seat Recline Position Sensor Circuit
2. DTC B1850 Seat Lumbar Horizontal Position Sensor Circuit
3. DTC B1860 Seat Lumbar Vertical Position Sensor Circuit
4. DTC B2355 Seat Front Vertical Position Sensor Circuit
5. DTC B2365 Seat Rear Vertical Position Sensor Circuit
6. DTC B2375 Seat Assembly Horizontal Position Sensor Circuit

This Vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.

DTC B1825, B1850, B1860, B2355, B2365, or B2375

The MSM must be powered and cannot have B1325 Battery Voltage Low as an active DTC for this DTC to set.

If the MSM sees the voltage signal from this sensor as either lower than 0.25 volts or higher than 4.75 volts, the sensor will be considered out of range and the MSM will set this DTC.

The MSM disables all memory recall commands of the motor monitored by the sensor. The motor will respond to manual positioning commands.

The MSM will clear the DTC when it detects that the voltage from the sensor signal circuit is between 0.25 volts and 4.75 volts.

1. The MSM is referenced in the Tech 2 as the driver position module (DPM) for this vehicle.
2. All position sensors use common low reference and 5-volt reference circuits.
3. If the 5-volt reference circuit is shorted to voltage multiple codes will set.
4. If the 5-volt reference circuit is shorted to ground multiple codes will set.
5. If the sensor low reference circuit is open multiple codes will set.

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step tests for the proper operation of the circuit in the high voltage range.
2. 4: This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

DTC B1825, B1850, B1860, B2355, B2365, or B2375

Symptoms - Seats

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2004-2007/remont/oem-general-information/#vehicle-dtc-information) in Vehicle DTC Information, before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Refer to the system description and operation from the following list in order to familiarize yourself with the system functions: «Power Seats System Description and Operation (w/o A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__power-seats-system-description-and-operation) «Power Seats System Description and Operation (with A45 Disabled)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__power-seats-system-description-and-operation) «Lumbar Support Description and Operation (with A45 enabled)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) «Lumbar Support Description and Operation (w/o A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) «Lumbar Support Description and Operation (with A45 disabled)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) «Heated/Vented Seat Description and Operation»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__heatedvented-seat-description-and-operation) «Heated Seats Description and Operation (Rear)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) «Memory Seats Description and Operation»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__memory-seats-description-and-operation)

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the power seats. Refer to «Checking Aftermarket Accessories»(/cadillac/sts/i-2004-2007/remont/body-electrical/#wiring-systems-electrical-power-management-introduction__checking-aftermarket-accessories) in Wiring Systems.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Inspect the seat adjuster track for conditions which may cause binding or objects within the seat adjustment range which obstruct movement or interfere with wiring.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Power Seat Inoperative (w/o A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__power-seat-inoperative-wo-a45) or «Power Seat Inoperative (with A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system)
2. «Lumbar Support Inoperative (w/o A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__lumbar-support-inoperative-wo-a45) or «Lumbar Support Inoperative (with A45)»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system)
3. «Vented Seat Inoperative»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system)
4. «Vented Seat Always On»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__vented-seat-always-on)
5. «Heated Seat Always On»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__heated-seat-always-on)
6. «Heated Seat Inoperative»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system)
7. «Heated Seat Always On - Rear»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__heated-seat-always-on-rear)
8. «Heated Seat Inoperative - Rear»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system)
9. «Heated Seat Switch Indicator Malfunction - Rear»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system__heated-seat-switch-indicator-malfunction)

Power Seat Inoperative (w/o A45)

Power Seat Inoperative (w/o A45)

The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.

The number below refers to the step number on the diagnostic table.

1. 8: This step tests the integrity of the signal circuits of the seat adjuster switch. If the fuse in the jumper wire opens when you perform this test, a short to ground may have occurred.

Power Seat Inoperative (with A45)

Lumbar Support Inoperative (w/o A45)

Lumbar Support Inoperative (w/o A45)

The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.

Lumbar Support Inoperative (with A45)

The number below refers to the step number on the diagnostic table.

1. 3: This step determines if the vented seat system is totally inoperative.
2. 4: This step determines which part of the seat is inoperative, the seat cushion or seat back.
3. 9: This step tests the integrity of the PWM serial data signal circuit from the memory seat module. This signal is a momentary 35 millisecond one shot pulse signal that is monitored through a momentary voltage change in the voltmeter when the switch is pressed. In order to accurately recognize the change in voltage, the voltmeter reading should be stable before performing this test.
4. 12: This step determines if the seat cushion blower has an internal short to ground or voltage.
5. 15: This step determines if the seat back blower has an internal short to ground or voltage.

Vented Seat Inoperative

Vented Seat Always On

Vented Seat Always On

Heated Seat Always On

Heated Seat Always On

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step determines if the heated seat system is totally inoperative.
2. 4: This step determines if the seat is completely inoperative, or if just one of the 2 seat cushions is inoperative.
3. 5: This step determines which part of the seat is inoperative, the seat cushion or seat back.
4. 10: This step tests the integrity of the heated seat switch signal from the memory seat module. This signal is a momentary 35 millisecond one shot pulse signal that is monitored through a momentary voltage change in the voltmeter when the switch is pressed. In order to accurately recognize the change in voltage, the voltmeter reading should be stable before performing this test.

Heated Seat Inoperative

Heated Seat Always On - Rear

Heated Seat Always On - Rear

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step determines if the rear heated seat system is totally inoperative.
2. 4: This step determines if the seat is completely inoperative, or if just one of the two seat cushions is inoperative.
3. 16: This step determines if the temperature sensor is open or if one of the sensor circuits is open. A short to battery voltage in the sensor signal circuit will open the sensor.

Heated Seat Inoperative - Rear

Rear Heated Seat Temperature Adjustment Inoperative

Rear Heated Seat Temperature Adjustment Inoperative

Heated Seat Switch Indicator Malfunction - Rear

Heated Seat Switch Indicator Malfunction - Rear

Scheme 16

Side Cover Assemblies, Adjuster Switch, Lumbar Switch, Back Panel Replacement - Front Seat

Scheme 17

Frame, Trim Cover, Heater, Pad, Blower, Power Adjuster Control Module Replacement - Front Seat Cushion

Scheme 18

Trim Cover, Heater, Pad, Blower Replacement - Front Seat Back

Scheme 19

Seat Belt Anchor, Back Frame, Power Adjuster with Frame Replacement - Front Seat

Scheme 20

Trim Cover, Pad, Support, Guide Replacement - Seat Head Restraint

Scheme 21

Seat Heater Control Module, Pad, Wire Harness, Frame Replacement - Rear Seat Back

Removal Procedure

1. Disable the SIR System. Refer to «SIR Disabling and Enabling Zone 7»(/cadillac/sts/i-2004-2007/remont/airbag/#supplemental-inflatable-restraint-system) for driver's seat or «SIR Disabling and Enabling Zone 9»(/cadillac/sts/i-2004-2007/remont/airbag/#supplemental-inflatable-restraint-system) for passenger seat in SIR.
2. Move the front seat forward in order to access the front seat track trim cover (1).
3. Remove the seat track trim cover (1) from the seat track.
4. Remove the seat track fasteners from the seat track.
5. Disconnect the seat electrical connectors (1).
6. With the aid of an assistant, remove the seat from the vehicle.

Installation Procedure

1. With the aid of an assistant, install the seat into the vehicle.
2. Insert the front tabs (1) on the seat track into the floor.
3. Connect the electrical connectors (1).
4. Install the seat track fasteners. Tighten: Tighten the seat track fasteners to 30 N.m (22 lb ft).
5. Install the seat track trim covers (1).
6. Enable the SIR System. Refer to «SIR Disabling and Enabling Zone 7»(/cadillac/sts/i-2004-2007/remont/airbag/#supplemental-inflatable-restraint-system) for driver's seat or «SIR Disabling and Enabling Zone 9»(/cadillac/sts/i-2004-2007/remont/airbag/#supplemental-inflatable-restraint-system) for passenger seat in SIR.

Scheme 22

Lumbar Replacement - Front Seat

Memory Seat Calibration Procedure

The memory seat module uses position sensor inputs to establish soft stop locations for the adjuster motors several millimeters ahead of the physical limits of the adjuster assembly. After replacing a memory seat module or adjuster components, it may be necessary to reset the adjuster motor soft stop locations. When the repair procedure has been completed, operate the seat adjuster switch in every direction until the seat adjuster reaches its mechanical hard stop by repeatedly pressing and releasing the switch as necessary.

Scheme 23

Armrest Replacement

1. Push in and pull up on the front of the rear seat cushion.
2. Lift up and out on the seat cushion.
3. Remove the rear seat cushion from the vehicle.

1. Install the rear seat cushion into the vehicle.
2. Engage the center wire hook, on the back of the seat cushion, under the seat back frame.
3. Position the rear seat buckles in the slots of the rear seat cushion.
4. Push down and rearward to seat the rear seat cushion into the latches in the number 4 bar. IMPORTANT: Pull up on the front of the rear seat cushion to ensure that the cushion is secure.

Scheme 24

Seat Cushion Cover and Pad Replacement - Rear

1. Remove the upper trunk trim. Refer to «Compartment Trim Panel Replacement - Rear»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
2. Remove the upper retaining nuts (1) from the rear seat back.
3. Remove the rear seat cushion. Refer to «Seat Cushion Replacement - Rear»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) .
4. Remove the center seat belt (2) and shoulder belt buckle nut (1), if equipped.
5. Place the center shoulder belt on the rear shelf panel.
6. Remove the lower seat back retaining nuts (1).
7. Pull out on the top of the rear seat back.
8. Position the rear shoulder belts to clear the rear seat back during removal.
9. Remove the rear seat back.

1. Install the rear seat back into the car.
2. Install the upper retaining nuts (1) to the seat back studs (2). Tighten: Tighten the nuts to 9 N.m (80 lb in).
3. Install the upper trunk trim. Refer to «Compartment Trim Panel Replacement - Rear»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
4. Install the rear seat back retaining nuts (1). Tighten: Tighten the nut to 9 N.m (80 lb in).
5. Install the center seat belt (2) and shoulder belt buckle anchor nut (1). Tighten: Tighten the bolts to 30 N.m (22 lb ft).
6. Install the rear seat cushion. Refer to «Seat Cushion Replacement - Rear»(/cadillac/sts/i-2004-2007/remont/seats/#seat-system) .

Power Seats System Description and Operation (w/o A45)

The passenger power seat system consists of the following components

1. Seat Adjuster Switch
2. Seat Horizontal Motor
3. Seat Front Vertical Motor
4. Seat Rear Vertical Motor
5. Seat Recline Motor
6. SEATS Circuit Breaker 30 A

Seat Adjuster Switch

The seat adjuster switches provide both power and ground to the selected seat motors. Battery positive voltage is supplied at all times to the passenger seat adjuster switches from the SEATS Circuit Breaker located in the left rear fuse block. Both seat adjuster switches are grounded through the switch ground circuit and G30.

Motors

All of the seat motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit. There are 4 seat position motors. These are the horizontal motor, front vertical motor, rear vertical motor, and the seat back recline motor. The horizontal motor moves the entire seat forward and rearward. The seat vertical motors may operate independently to tilt the front or rear of the seat cushion up or down. Both motors can also run simultaneously to move the entire seat up or down. The recline motor moves the angle of the seat back forward or rearward.

Horizontal

When the seat switch is operated to move the entire seat forward, battery positive voltage is applied through the switch contacts and the horizontal motor forward control circuit to the motor. The motor is grounded through the horizontal motor rearward switch contacts and the horizontal motor rearward control circuit to the motor. The motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.

Rear Vertical

When the seat switch is operated to tilt the rear of the seat cushion up, battery positive voltage is applied through the switch contacts and the rear vertical motor up control circuit to the rear vertical motor. The motor is grounded through the down switch contacts and the rear vertical motor down control circuit to the motor. The motor runs in order to drive the rear of the seat cushion up until the switch is released. Tilting the rear of the seat cushion down works similarly to tilting the rear of the seat cushion up, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.

Front Vertical

When the seat switch is operated to tilt the front of the seat cushion up, battery positive voltage is applied through the switch contacts and the front vertical motor up control circuit to the motor. The motor is grounded through the down switch contacts and the front vertical motor down control circuit to the motor. The motor runs in order to drive the front of the seat cushion up until the switch is released. Tilting the front of the seat cushion down works similarly to tilting the front of the seat cushion up, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.

Entire Seat Up or Down

When the seat switch is operated in order to move the entire seat to the up position, battery positive voltage is simultaneously applied through the front and rear vertical motor up switch contacts and the front and rear vertical motor up control circuits to both vertical motors. The motors are grounded through the down switch contacts and the front and rear vertical motor down control circuits to both vertical motors. Both motors run simultaneously in order to drive the entire seat up until the switch is released. Moving the entire seat down works similarly to moving the entire seat up, except that battery positive voltage and ground are applied on the opposite circuits causing the motors to run in the opposite direction.

Recline

When the seat recline switch is operated to move the seat back forward, battery positive voltage is applied through the switch contacts and the recline motor forward control circuit to the motor. The motor is grounded through the rearward switch contacts and the recline motor rearward control circuit to the motor. The motor runs in order to move the seat back forward until the switch is released. Moving the seat back rearward works similarly to moving the seat back forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction.

Power Seats System Description and Operation (with A45 Disabled)

The driver power seat system with a non-memory configured memory seat module (MSM) consists of the following components

1. Memory Seat Module
2. Seat Adjuster Switch
3. Seat Horizontal Motor
4. Seat Front Vertical Motor
5. Seat Rear Vertical Motor
6. Seat Recline Motor
7. PWR Seat Circuit Breaker 30 A
8. MEM T&T Fuse 10 A

Non Memory MSM and IPM

The non memory version of the driver power seat still includes the memory seat module (MSM). The RPO codes for seating are A45 for memory and AL2 for lumbar. The instrument panel module (IPM) contains a configuration frame for the vehicle RPOs and is configured according to RPO content. In order for the MSM to determine the memory configuration it looks for 2 signals, via GMLAN, from the IPM to determine the seating RPO content. These signals are Memory Seat Present (A45) and Memory Lumbar Present (AL2). When these signals are FALSE, the seat is non memory, and the MSM will not look for inputs from the seat position sensors. However; sense the MSM controls the steering column, it always looks for column position sensor inputs. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

Battery positive is supplied at all times to the seat adjuster switch from the MEM T&T Fuse located in the rear fuse block. When the power seat switches are pressed they send a 12 volt signal to the memory seat module (MSM). The MSM commands the selected seat motor to move in response to the switch inputs.

MSM Power and Grounds

Battery positive voltage is supplied at all times to the memory seat module (MSM) from the PWR SEAT Circuit Breaker located in the rear fuse block. This voltage is used to power up MSM and also to apply power to the seat motors when commanded. Battery positive is also supplied to the MSM from the MEM T&T Fuse located in the rear fuse block. The MSM monitors this voltage to determine the state of power at seat adjuster switch. If voltage is not detected from this circuit, the MSM will cancel or disable all memory recall functions. Ground is provided to the module through the ground circuit and G 307.

Seat Motors

The memory seat module (MSM) controls the movement for each of the seat directional motors and the 2 lumbar motors. Refer to Lumbar Support Description and Operation (with A45 enabled) or Lumbar Support Description and Operation (w/o A45) or Lumbar Support Description and Operation (with A45 disabled) . All of the motors operate independently of each other. Each motor contains a electronic circuit breaker (PTC), which will reset only after voltage has been removed from the motor.

There are 4 motors that move the position of the seat. These are the seat horizontal motor, front vertical motor, rear vertical motor and the recline motor. The horizontal motor moves the entire seat forward and rearward. Both vertical motors can run simultaneously when the seat switch is operated in order to move the entire seat up and down. Or they can be selected independently to vertically tilt the front or rear of the seat up and down. The recline motor moves the angle of the seat back forward or rearward.

All seat motors are reversible. For example, when a seat switch is pressed to move the entire seat forward, battery positive voltage is applied through the power seat horizontal forward switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the driver seat horizontal motor forward control circuit and ground through the driver seat horizontal motor rearward control circuit to the motor. The motor runs in order to drive the entire seat forward. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction. All of the seat motors are powered this way.

Soft stop functions are not used for driver seat motors that are controlled by either a memory or non-memory MSM. However, soft stop functions are used for the MSM controlled steering column motors. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

Lumbar Support Components

The driver seat lumbar support system with memory (A45) consists of the following components

1. Lumbar switch
2. Memory seat module (MSM)
3. Lumbar horizontal motor
4. Lumbar vertical motor
5. Lumbar horizontal position sensor
6. Lumbar vertical position sensor
7. DPM Fuse 10 A

The memory seat module (MSM) is referenced in the Tech 2 as the driver position module (DPM).

Lumbar Switch

Battery positive voltage is supplied at all times to the driver seat lumbar switch from the DPM Fuse located in the left rear fuse block. When the lumbar switches are pressed they send a 12-volt signal to the memory seat module (MSM). The MSM then commands the lumbar motors to move in response to the switch signals.

The lumbar support system consists of 2 motors, horizontal and vertical, that operate independently of each other. The lumbar horizontal motor moves the lumbar support in the forward or rearward directions while the lumbar vertical motor moves the lumbar support in the up or down directions. Each motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit.

Soft stop functions are not used for driver seat motors that are controlled by either a memory or non-memory MSM. However, soft stop functions are used for the MSM controlled steering column motors. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

Lumbar Horizontal Movement

When the lumbar switch is operated to move the lumbar support forward, battery positive voltage is applied through the switch contacts and the driver seat lumbar forward switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the lumbar motor forward control circuit and ground through the lumbar motor rearward control circuit to the motor. The motor runs to drive the lumbar support forward toward the occupant's back until the switch is released. Moving the lumbar support rearward works similarly to moving the lumbar support forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction. The MSM also controls the lumbar horizontal motor during memory recall functions.

Lumbar Vertical Movement

When the lumbar switch is operated to move the lumbar support up, battery positive voltage is applied through the switch contacts and the driver seat lumbar up switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the lumbar motor up control circuit and ground through the lumbar motor down control circuit to the motor. The motor runs to drive the lumbar support up until the switch is released. Moving the lumbar support down works similarly to moving the lumbar support up, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction. The MSM also controls the lumbar vertical motor during memory recall functions.

Lumbar Position Sensors

The lumbar position sensors are potentiometers which are an internal part of each lumbar motor. The MSM supplies a 5-volt reference voltage through the 5-volt reference circuit and ground through the low reference circuit to each lumbar position sensor. When the lumbar motor rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. This voltage varies from 0.25-4.75 volts. The MSM monitors this voltage signal to determine the lumbar position.

When a memory set command is received, the MSM records the lumbar position by storing the feedback voltage from each position sensor. Then when a memory recall command is received, the MSM moves the motors until the position sensor feedback voltages equals the feedback voltages stored in memory. The lumbar support is not involved in the easy exit function.

Memory Functions

Refer to Memory Seats Description and Operation .

The passenger seat lumbar support system consists of the following components

1. Lumbar Switch
2. Lumbar Horizontal Motor
3. Lumbar Vertical Motor
4. PWR SEAT Circuit Breaker 30 A
5. RR LUM/ANT Fuse 20 A

Battery positive voltage is supplied at all times to the passenger seat lumbar switch from the PWR SEAT Circuit Breaker located in the rear fuse block. The lumbar switch is grounded through the switch ground circuit and G30. The lumbar switch provides both power and ground to the selected lumbar motors.

The lumbar support system consists of two lumbar motors, horizontal and vertical, that operate independently of each other. Each motor contains an electronic circuit breaker (PTC) that will reset only after voltage has been removed from the motor. The lumbar horizontal motor moves the lumbar support forward and rearward and the lumbar vertical motor moves the lumbar support up and down.

When the lumbar switch is operated to move the lumbar support rearward, battery positive voltage is applied through the lumbar rearward switch contacts and the lumbar motor rearward control circuit to the lumbar horizontal motor. The motor is grounded through the lumbar forward switch contacts and the lumbar motor forward control circuit to the horizontal motor. The motor runs to drive the lumbar support rearward away from the occupant's back until the switch is released. Moving the lumbar support forward works similarly to moving the lumbar support rearward, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.

Vertical

When the lumbar switch is operated to move the lumbar support up, battery positive voltage is applied through the lumbar up switch contacts and the lumbar motor up control circuit to the lumbar vertical motor. The motor is grounded through the lumbar down switch contacts and the lumbar motor down control circuit to the vertical motor. The motor runs to drive the lumbar support up until the switch is released. Moving the lumbar support down works similarly to moving the lumbar support up, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.

The driver seat lumbar support system with a non-memory configured memory seat module (MSM) consists of the following components

1. Lumbar Switch
2. Memory seat module (MSM)
3. Instrument panel module (IPM)
4. Lumbar horizontal motor
5. Lumbar vertical motor
6. Lumbar horizontal position sensor
7. Lumbar vertical position sensor
8. DPM Fuse 10 A

The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.

The non-memory version of the driver power seat and lumbar still includes the Memory Seat Module (MSM). The RPO codes for seating are A45 for memory and AL2 for lumbar. The instrument panel module (IPM) contains a configuration frame for the vehicle RPOs that is configured according to each vehicle RPO content. In order for the MSM to determine memory configuration, it looks for 2 signals via GMLAN serial data from the IPM to determine seating content. These signals are Memory Seat Present (A45) and Memory Lumbar Present (AL2). When these signals are FALSE, the seat is non-memory and the MSM will not look for inputs from the seat position sensors. However, the MSM always looks for column position sensor inputs. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

Battery positive voltage is supplied at all times to the driver seat lumbar switch from the DPM Fuse located in the left rear fuse block. When the lumbar switches are pressed they send a 12-volt signal to the MSM. The MSM then commands the lumbar motors to move in response to the switch signals.

The lumbar support system consists of 2 motors, horizontal and vertical, that operate independently of each other. The lumbar horizontal motor moves the lumbar support in the forward or rearward directions while the lumbar vertical motor moves the lumbar support in the up or down directions. Each motor contains a positive temperature coefficient (PTC) circuit breaker that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit.

Soft stop functions are not used for driver seat motors that are controlled by either a memory or non-memory MSM. However, soft stop functions are used for the MSM controlled steering column motors. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

When the lumbar switch is operated to move the lumbar support forward, battery positive voltage is applied through the switch contacts and the driver seat lumbar forward switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the lumbar motor forward control circuit and ground through the lumbar motor rearward control circuit to the motor. The motor runs to drive the lumbar support forward toward the occupant's back until the switch is released. Moving the lumbar support rearward works similarly to moving the lumbar support forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction.

When the lumbar switch is operated to move the lumbar support up, battery positive voltage is applied through the switch contacts and the driver seat lumbar up switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the lumbar motor up control circuit and ground through the lumbar motor down control circuit to the motor. The motor runs to drive the lumbar support up until the switch is released. Moving the lumbar support down works similarly to moving the lumbar support up, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction.

Heated/Vented Seat Description and Operation

The heated/vented seat system consists of the following components

1. Heated/Vented seat switch
2. Climate control seat module
3. HVAC control module
4. Memory seat module (MSM)
5. Seat cushion heater element
6. Seat back heater element
7. Temperature sensor
8. Seat cushion blower motor
9. Seat back blower motor
10. RF HTD ST/S-BAND Fuse 20 A
11. IGN 3 Fuse 10 A
12. DPM Fuse 10 A

Helpful Hints

1. The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.
2. The vented seat is also referenced as the cooled seat for this vehicle.
3. The climate control seat module, located under the front passenger seat cushion, controls the heated and vented seat operations for both the driver and front passenger seats.

Power and Ground

Battery positive voltage is supplied to the climate control seat module from the IGN 3 Fuse located in the left rear fuse block. This voltage is used to power up the climate control seat module allowing the heated seats to operate only when the ignition switch is in the ON position. Battery positive voltage is also supplied at all times to the climate control seat module from the RF HTD ST/S-BAND fuse located in the right rear fuse block. This voltage is used by the module to supply power to the seat heating elements and is wired directly to the front passenger vented seat blower motors. Battery positive voltage is supplied directly to the driver vented seat blower motors from the DPM fuse located in the left rear fuse block. Ground is provided to the module through the module ground circuit and G307.

Heated/Vented Seat Switch

Separate heated and vented seat switches located in the HVAC control module control the driver and passenger heated/vented seats. When a heated or vented seat switch is pressed, the HVAC control module sends a GMLAN message via the serial data line to the MSM indicating the heated or vented seat command. In response to this signal, the MSM sends a low side PWM signal through the appropriate driver or passenger PWM serial data circuit to the climate control seat module. The module then activates the appropriate heated or vented seat mode. The MSM then sends a GMLAN message back to the HVAC module to illuminate the appropriate temperature indicator.

Heated Seat Operation

When the ignition is turned to the ON position, the heated/vented seats will initialize in the OFF state. When the heated seat switch is pressed once, the climate control seat module applies battery positive voltage through the heated seat element supply voltage circuit to the seat cushion and seat back heating elements, initially setting the seat temperature to high heat. Then with each additional activation of the switch, the climate control seat module will cycle the temperature setting to MED, LOW, and OFF. The module will also turn off the heated seat function whenever the ignition switch is turned to the OFF position.

Temperature Regulation

The heated seat system is designed to warm the seat cushion and seat back to approximately 42°C (107.6°F) when in the high heat position, 39.5°C (103.1°F ) when in the medium heat position, and 37°C (98.6°F) when in the low heat position. The climate control seat module monitors the seat temperature through the temperature sensor signal circuit and the temperature sensor (thermistor) that is located in the seat cushion. The temperature sensor is a variable resistor, its resistance changes as the temperature of the seat changes. When the temperature sensor resistance indicates to the climate control seat module that the seat has reached the desired temperature, the module turns off the element supply voltage to the seat heating elements. The module will then cycle the element supply voltage on and off in order to maintain the desired temperature.

Vented Seat Modes of Operation

When the ventilation seat system is active, it is designed to draw cabin air around and away from the occupant through small holes in the seat cushion and seat back covers, through channels in the foam pad, and then through the blower motor exhausting the waste air under the seat cushion.

Battery positive voltage is supplied at all times to the driver seat blower motors from the DPM Fuse located in the left rear fuse block. Battery positive voltage is also supplied at all times to the front passenger seat blower motors from the RF HTD ST/S BAND Fuse located in the right rear fuse block. Both, the driver seat and passenger seat blower motors are grounded through their ground circuits and G307. When a vented seat switch is pressed, the climate control seat module sends a low side pulse width modulation (PWM) signal through the blower motor control circuits to the seat cushion and seat back blower motors indicating the vented seat command. In response to this signal, the logic in the blower motors set the blower speed to the switch set point. Both blower motors then run drawing cabin air around and away from occupant. The following describes the High, MED, and Low ventilation modes of operation

1. High Ventilation This mode cancels all previous modes and initiates a ventilation cycle with the Under-Cool and Super-Cool Features active. See below for the description of these features. In the high mode, both the seat cushion and seat back blowers are ON at a 95 percent duty cycle that provides 100 percent blower performance.
2. Medium Ventilation This mode operates identical to the High Ventilation setting with the exception that the blowers are ON at a 85 percent duty cycle that provides 80 percent blower performance.
3. Low Ventilation This mode also operates identical to the High Ventilation setting with the exception that the blowers are ON at a 75 percent duty cycle that provides 60 percent blower performance.

During vented seat modes of operation, the climate control seat module uses Under-cool and Super Under-cool Features in order to keep the seat temperature above pre-determined set point temperatures. The following describes these features

1. Under-Cool Feature The under-cool feature set point is 15°C (59°F). The climate control seat module under-cool feature is active when the system is in any one of the 3 High, MED, or Low ventilation modes. The under-cool feature will initiate a heat cycle when it detects that the seat temperature reached its set point of 15°C (59°F). This means that if the seat temperature reaches this set point, it is possible for both, the blowers and heaters to be on at the same time. Then if the control module does not detect that the operating temperature is above the set point within 90 seconds of the initiation of under-cool mode, the module will shut down and cease operation.
2. Super Under-Cool Feature The super under-cool feature set point is 10°C (50°F). The super under-cool feature is also active when the system is in any of the three ventilation modes. This feature is meant as a secondary precautionary measure. The super under-cool feature will deactivate the blower motors and initiate a heat cycle when it detects that the seat temperature reached its set point of 10°C (50°F). This means that it is possible for the seat heaters to be on and the blowers off while in the ventilation mode. If the control module does not detect that the operating temperature is above the set point within 90 seconds of the initiation of super under-cool mode, the module will shut down and cease operation.

Load Management

The power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high discharge condition. The heated/vented seat system is one of the vehicle loads that is subject reduction during a battery discharge condition. For more information on load management refer to Load Shed System Description and Operation in Engine Electrical and Body Control System Description and Operation in Computer/Integrating Systems.

Heated Seat Components

The rear heated seat system has one control module that controls heat operation for both the left and right rear seat. The rear heated seat consists of the following components

1. Rear auxiliary HVAC control module
2. Right Heated Seat Switch
3. Left seat cushion heating element
4. Left seat back heating element
5. Left seat cushion temperature sensor
6. Right seat cushion heating element
7. Right seat back heating element
8. Right seat cushion temperature sensor
9. REAR HTD SEATS Fuse 20 A

Power and Grounds

Battery positive voltage is supplied to the rear heated seat module through the ignition 3 voltage circuit and the REAR HTD SEATS Fuse that is located in the left rear fuse block. This voltage is used to power up the heated seat module and to supply power to the seat heater elements. This voltage supply allows the heated seat system to operate only with the ignition switch in the ON position. The rear heated seat module is grounded through the module ground circuit and G402.

Modes of Operation

There is 1 mode available for heated seat operation; both the seat cushion and seat back heat turn on and off together. When a heated seat temperature signal request is received, the heated seat module will activate both the seat cushion and seat back heating elements.

Heated Seat Switch/LED Indicators and Operation

The left and right rear heated seats are controlled by separate heated seat switches both located in the rear climate control panel (RCCP). Battery positive voltage is supplied to the RCCP by the rear heated seat module. The rear heated seat module controls the heated seat operation for both, the left and right rear heated seats, and the heated seat switch temperature indicators.

The following describes the sequence of operation and how the heated seat module responds to each of the switch inputs.

1. High Temperature: When the heated seat switch is pressed once, battery positive voltage is applied through the switch contacts and the switch signal circuit to the heated seat module indicating the high heat request. In response to this signal, the module applies battery positive through the heating element supply voltage circuits to the seat cushion and seat back heating elements. At the same time, it activates the low side drivers that supply a ground through the heating element control circuits to the seat heating elements. The module then applies a ground through the high temperature indicator control circuit illuminating the high temperature indicator to indicate the high temperature mode.
2. Medium Temperature: When the switch is pressed a second time, the heated seat module sets the temperature level to medium heat. Then it removes the ground from the high temperature indicator and applies ground to the medium temperature indicator to indicate the medium temperature mode.
3. Low Temperature: When the switch is pressed a third time, the heated seat module sets the temperature level to low heat. Then it removes the ground from the medium temperature indicator and applies ground to the low temperature indicator to indicate the low temperature mode.
4. System Off State: When the switch is pressed a fourth time, the heated seat module removes the battery voltage and grounds from the heating elements. Then it removes the ground from the low temperature indicator, indicating the system off state.

The heated seat system is designed to warm the seat cushion and seat back to approximately 42°C (107.6°F) when in the high position, 39.5°C (103°F) when in the MED position, and 37°C (98.6°F) when in the low position. The heated seat module monitors the seat temperature through the temperature sensor signal circuit and the temperature sensor (thermistor) which is located in the seat cushion. The temperature sensor is a variable resistor, it's resistance varies as the temperature of the seat changes. When the temperature sensor resistance indicates to the heated seat module that the seat has reached the desired temperature, the module opens the ground path of the seat heating elements through the heated seat element control circuit. The module will then cycle the low side driver element control circuits open and closed in order to maintain the desired temperature.

Memory Seats Description and Operation

The memory seat system consists of the following components

1. Memory seat module (MSM)
2. Seat adjuster switch
3. Seat lumbar switch
4. Seat horizontal motor
5. Seat front vertical motor
6. Seat rear vertical motor
7. Seat recline motor
8. Lumbar horizontal motor
9. Lumbar vertical motor
10. Seat horizontal position sensor
11. Seat front vertical position sensor
12. Seat rear vertical position sensor
13. Seat recline position sensor
14. Lumbar horizontal positional sensor
15. Lumbar vertical position sensor
16. Seats Circuit Breaker 30 A
17. DPM Fuse 10 A

The memory seat module (MSM) is referenced in the Tech 2 as the driver position module (DPM).

Personalization Option

The MSM cannot perform memory recall functions unless the Personalization Option is enabled. The personalization is located in the radio (IRC). The radio reports the personalization setting to the MSM, as well as other receiving modules, via GMLAN message each time the ignition is cycled to the ON position. The MSM will then store the personalization option setting and examine it before making a memory seat adjustment. The personalization option setting stored within the MSM will not change until the personalization setting in the radio is changed.

Battery positive is supplied at all times to the seat adjuster switch from the DPM Fuse located in the left rear fuse block. When the power seat switches are pressed they send a 12-volt signal to the MSM. The MSM then commands the selected seat motor to move in response to the switch inputs.

Battery positive voltage is supplied at all times to the MSM from the SEATS Circuit Breaker located in the left rear fuse block. This voltage is by the MSM to apply power to the seat motors when commanded. Battery positive is also supplied to the MSM from the DPM Fuse also located in the left rear fuse block. The MSM uses this voltage to power up the module. Ground is provided to the MSM through the ground circuit and G 307.

The memory seat module controls the movement for each of the seat directional motors and the 2 lumbar motors. Refer to Lumbar Support Description and Operation (with A45 enabled) or Lumbar Support Description and Operation (w/o A45) or Lumbar Support Description and Operation (with A45 disabled) . All of the motors operate independently of each other. Each seat motor contains a electronic circuit breaker (PTC), which will reset only after voltage has been removed from the motor.

There are 4 motors that move the position of the seat. These are the seat horizontal motor, front vertical motor, rear vertical motor and the recline motor. The horizontal motor moves the entire seat forward and rearward. Both vertical motors can run simultaneously when the seat switch is operated in order to move the entire seat up and down, or they can be selected independently to vertically tilt the front or rear of the seat up and down. The recline motor moves the angle of the seat back forward or rearward.

All seat motors are reversible. For example, when a seat switch is pressed to move the entire seat forward, battery positive voltage is applied through the power seat horizontal forward switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage through the driver seat horizontal motor forward control circuit and ground through the driver seat horizontal motor rearward control circuit to the motor. The motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction. All of the seat motors are powered this way.

Soft stop functions are not used for driver seat motors that are controlled by either a memory or non-memory MSM. However, soft stop functions are used for the MSM controlled steering column motors. Refer to Steering Wheel and Column Description and Operation in Steering Wheel and Column.

Position Sensors

The seat position sensors are potentiometers that are either attached directly to the motor's transmission cable or are an internal part of the motor. The MSM supplies a 5-volt reference voltage via the 5-volt reference circuit and ground via the sensor low reference circuit to the respective seat position sensors. When the motor or cable rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. The voltage varies from 0.25 volts to 4.75 volts. The MSM monitors this voltage signal to determine the position of the seat. When a memory set command is received, the MSM records the seat position by storing the feedback voltage from each position sensor. Then when a memory recall command is received, the MSM moves the motors until the position sensor feedback voltages equals the feedback voltages stored in memory. For the easy exit function, only seat position sensor feedback voltages are recorded and only the seat motors are controlled. The lumbar support is not involved in the easy exit function.

The memory feature will allow you to program and recall memory seat, steering column, and seat lumbar settings for up to two drivers. The MSM will not respond to memory recall functions while manual positioning is in process. Any memory commands received during manual seat operation will be lost. The MSM may contain preset memory and exit positions for assembly plant testing until modified by a record memory operation.

The easy key module (EKM) identifies the driver and transmits the driver ID via GMLAN message to the radio and MSM. All voice activated memory recall and memory set commands are received by the MSM via GMLAN messages from the radio.

For vehicles with the base audio system, memory features are programmed and recalled through the radio from the DRIVER SELECTION and the DRIVER EXIT SETTINGS submenus. Refer to Radio/Audio System Description and Operation in Entertainment.

For vehicles with the Navigation system, memory features are programmed and recalled through the navigation display. Refer to Navigation System Description and Operation in Navigation Systems.

Also for vehicles with the Navigation System, you can recall memory features by using voice recognition. Refer to Vehicle Personalization (w/o Voice Recognition) or Vehicle Personalization (w/ Voice Recognition) in Personalization and to Navigation System Description and Operation in Navigation Systems.

Memory recall will not work if the shift lever is out of NEUTRAL (N) or PARK (P).

Recall Personalization

When a keyless entry transmitter is used in order to unlock the vehicle's doors, the remote keyless entry (RKE) module communicates the unlock command and which driver performed the command to the radio and MSM via a GMLAN message. The following are 2 personalized recall options when the MSM receives an unlock message

1. Recall immediately upon receipt of the RKE message
2. Do not recall upon receipt of an RKE message. With this feature turned off, a memory recall can be configured to activate when the ignition button is pressed.

Memory Inhibit/Enable

The MSM receives the ignition switch signal and the gear selector position via GMLAN messages. When the ignition switch is in the OFF position, memory record, memory recall, personalization recall, and exit recall functions are all allowed. When the ignition switch is in the ON position and the gear selector is in the PARK position, only the recall personalization function is deactivated and all other memory functions are allowed. When the ignition switch is in the ON position and the gear selector is out of the PARK position, only memory record is allowed, all other memory seat functions are not allowed.

See also:
• Diagnostic System Check - Vehicle
• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing
• Wiring Repairs
• Connector Repairs
• Control Module References
• DTC Symptom Description
• Checking Aftermarket Accessories
• HVAC Control Assembly Replacement - Auxiliary
• Fastener Notice
• SIR Caution
• SIR Disabling and Enabling Zone 7
• Compartment Trim Panel Replacement - Rear
• Steering Wheel and Column Description and Operation
• Load Shed System Description and Operation
• Body Control System Description and Operation
• Radio/Audio System Description and Operation
• Navigation System Description and Operation
• Vehicle Personalization (w/o Voice Recognition)
• Vehicle Personalization (w/ Voice Recognition)
• Driver Seat Schematics
• Power Seats System Description and Operation (w/o A45)
• Heated/Vented Seat Description and Operation
• Memory Seats Description and Operation
• Power Seat Inoperative (w/o A45)
• Lumbar Support Inoperative (w/o A45)
• Vented Seat Always On
• Heated Seat Always On
• Heated Seat Always On - Rear
• Heated Seat Switch Indicator Malfunction - Rear
• Symptoms - Seats
• Fastener Tightening Specifications