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.
Power Seat Inoperative (w/o A45)
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views DEFINITION: One or more of the power seat functions are inoperative. | |||
| 1 | Did you review the power seat system description and operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Verify that the power seat inoperative complaint is present. Attempt to operate all of the power seat motors through their full range of adjustment. Does the power seat system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Are all of the power seat motors inoperative? | Go to Step 4 | Go to Step 6 |
| 4 | Disconnect the seat adjuster switch. Connect a test lamp from the battery positive voltage circuit of the switch connector to a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 10 |
| 5 | Connect a test lamp from the battery positive voltage circuit of the switch connector to the ground circuit of the switch connector. Does the test lamp illuminate? | Go to Step 9 | Go to Step 11 |
| 6 | Disconnect the inoperative seat motor. Connect a test lamp between the motor control circuits of the harness connector. Operate the appropriate seat switch in both directions. Does the test lamp illuminate in both directions? | Go to Step 8 | Go to Step 7 |
| 7 | Test the motor control circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 9 |
| 8 | Inspect for poor connections at harness connector of the inoperative seat motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
| 9 | Inspect for poor connections at harness connector of the seat adjuster switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
| 10 | Repair the short to ground or open in the battery positive voltage circuit of the seat adjuster switch. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 14 | |
| 11 | Repair the open in the ground circuit of the seat adjuster switch. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 14 | |
| 12 | Replace the seat adjuster switch. Refer to Side Cover Assemblies, Adjuster Switch, Lumbar Switch, Back Panel Replacement - Front Seat . Did you complete the replacement? | Go to Step 14 | |
| 13 | Replace the seat motor. Refer to Seat Belt Anchor, Back Frame, Power Adjuster with Frame Replacement - Front Seat . Did you complete the replacement? | Go to Step 14 | |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Power Seat Inoperative (w/o A45)
Lumbar Support Inoperative (w/o A45)
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views DEFINITION: One or more of the power lumbar functions are inoperative. | |||
| 1 | Did you review the Lumbar Support System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Verify that the Lumbar Support Inoperative complaint is present, by attempting to operate the lumbar support motor through it's full range of adjustment. Does the lumbar support system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Disconnect the lumbar switch harness connector. Connect a test lamp from the battery positive voltage circuit of the switch connector to a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 9 |
| 4 | Connect a test lamp between the battery positive voltage circuit of the switch connector and the ground circuit of the switch connector. Does the test lamp illuminate? | Go to Step 5 | Go to Step 10 |
| 5 | Disconnect the lumbar motor harness connector. Connect a test lamp between the motor control circuits of the harness connector. Operate the lumbar switch in both directions. Does the test lamp illuminate in both directions? | Go to Step 7 | Go to Step 6 |
| 6 | Test the motor control circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the lumbar motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
| 8 | Inspect for poor connections at the harness connector of the lumbar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
| 9 | Repair the open in the battery positive voltage circuit of the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | |
| 10 | Repair the open in the ground circuit of the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | |
| 11 | Replace the lumbar switch. Refer to Side Cover Assemblies, Adjuster Switch, Lumbar Switch, Back Panel Replacement - Front Seat . Did you complete the replacement? | Go to Step 13 | |
| 12 | Replace the lumbar motor Refer to Lumbar Replacement - Front Seat . Did you complete the replacement? | Go to Step 13 | |
| 13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Lumbar Support Inoperative (w/o A45)
Vented Seat Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views DEFINITION: The driver or passenger vented seat stays On. | |||
| 1 | Did you review the vented seat operation and perform the necessary inspection? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Verify that the Vented Seat Always On complaint is present. Does the vented seat system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Vented Seat Switch parameter in the HVAC Control Module data list. heated/vented seatDoes the Vented Seat Switch parameter display Pressed? | Go to Step 6 | Go to Step 4 |
| 4 | Test the fan speed control circuit between the climate control seat module and the blower motor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
| 5 | Inspect for poor connections at the harness connector of the climate control seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
| 7 | Replace the climate control seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete replacement? | Go to Step 9 | |
| 8 | Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 9 | |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Vented Seat Always On
Heated Seat Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views DEFINITION: The driver or passenger seat stays warm. | |||
| 1 | Did you review the heated seat operation and perform the necessary inspection? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Verify that the Heated Seat Always On complaint is present. Does the heated seat system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Heated Seat Switch parameter in the HVAC Control Module data list. Does the Heated Seat Switch parameter display Pressed? | Go to Step 6 | Go to Step 4 |
| 4 | Test the heated seat element supply voltage circuit between the climate control seat module and the seat heating elements for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
| 5 | Inspect for poor connections at the harness connector of the climate control seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
| 7 | Replace the climate control seat module. Refer to Control Module References in Computer/Integrating Systems. Did you complete replacement? | Go to Step 9 | |
| 8 | Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 9 | |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Heated Seat Always On
Heated Seat Always On - Rear
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Rear Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views | |||
| 1 | Did you review the heated seat operation and perform the necessary inspection? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Verify that the Heated Seat Always On - Rear complaint is present. Does the heated seat system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Disconnect the rear heated seat switch harness connector. Does the seat cool down? | Go to Step 6 | Go to Step 4 |
| 4 | Test the appropriate rear heated seat switch signal circuit between the heated seat switch and the rear heated seat module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
| 5 | Inspect for poor connections at the harness connector of the rear heated seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the rear heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
| 7 | Replace the rear heated seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete replacement? | Go to Step 9 | |
| 8 | Replace the rear heated seat switch. Refer to HVAC Control Assembly Replacement - Auxiliary in HVAC Systems - Automatic. Did you complete the replacement? | Go to Step 9 | |
| 9 | Operate the system in order to verify the repair Did you correct the condition? | System OK | Go to Step 2 |
Heated Seat Always On - Rear
Heated Seat Switch Indicator Malfunction - Rear
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views DEFINITION: The heated seat switch mode indicator is inoperative, but the heated seat system operates OK. | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Verify that the Heated Seat Switch Indicator Malfunction - Rear is present. Does the rear heated seat switch indicators operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Turn ON the ignition, with the engine OFF. Is the heated seat switch indicator always on? | Go to Step 6 | Go to Step 4 |
| 4 | Turn OFF the ignition. Disconnect the rear heated seat switch connector. Turn ON the ignition, with the engine OFF. Connect a 3-amp fused jumper wire from battery voltage to the battery voltage terminal of the rear heated seat switch. Probe the appropriate indicator terminal of the heated seat switch with a test lamp that is connected to a good ground. Does the inoperative heated seat switch indicator illuminate? | Go to Step 5 | Go to Step 8 |
| 5 | Test the control circuit of the inoperative heated seat switch indicator between the rear heated seat switch and the rear heated seat module for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
| 6 | Test the control circuit of the inoperative heated seat switch indicator between the rear heated seat switch and the rear heated seat module for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the rear heated seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
| 8 | Inspect for poor connections at the harness connector of the rear heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
| 9 | Replace the rear heated seat module. Refer to Control Module References in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 11 | |
| 10 | Replace the rear heated seat switch. Refer to HVAC Control Assembly Replacement - Auxiliary in HVAC Systems - Automatic. Did you complete the replacement? | Go to Step 11 | |
| 11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Heated Seat Switch Indicator Malfunction - Rear
Scheme 19
| Callout | Component Name |
|---|---|
| Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| Switch Cover Assembly Replacement | |
| 1 | Cover Assembly, Switch Tip: Disconnect the electrical connector. |
| Front Seat Back Panel Assembly Replacement | |
| 2 | Panel Assembly, Front Seat Back |
| Outboard Front Cover Assembly Replacement | |
| 1 | Cover Assembly, Switch Tip: Disconnect the electrical connector. |
| 3 | Cover Assembly, Outboard Front |
| Front Adjuster Cover Assembly Replacement | |
| 4 | Cover Assembly, Front Adjuster Tip: Disconnect the electrical connector. |
| Inboard Front Cover Assembly Replacement | |
| 5 | Cover Assembly, Inboard Front |
| Rear Adjuster Cover Assembly Replacement | |
| 2 | Panel Assembly, Front Seat Back |
| 6 | Cover Assembly, Adjuster Rear |
| Seat Adjuster Switch Assembly Replacement | |
| 1 | Cover Assembly, Switch Tip: Disconnect the electrical connector. |
| 10 | Switch Assembly, Front Seat Lumbar Tip: Disconnect the electrical connector. |
| 11 | Switch Assembly, Front Seat Adjuster Tip: Remove the seat adjuster knobs to remove the switch from the trim cover. |
Side Cover Assemblies, Adjuster Switch, Lumbar Switch, Back Panel Replacement - Front Seat
Scheme 20
| Callout | Component Name |
|---|---|
| Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| Front Seat Cushion Frame Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| Front Seat Cushion Cover Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| 2 | Cover Assembly, Front Seat |
| Front Seat Cushion Climate Control Heated Ventilated Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| 3 | Climate Control Heat Ventilated Assembly, Front Seat Cushion |
| Front Seat Cushion Pad Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| 4 | Pad Assembly, Front Seat Cushion |
| Front Seat Cushion Blower Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| 5 | Screw, Module Blower |
| 6 | Blower Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| Front Seat Memory Adjuster Module Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Frame Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| 7 | Module Assembly, Front Seat Adjuster Memory Tip: Disconnect the electrical connectors. |
Frame, Trim Cover, Heater, Pad, Blower, Power Adjuster Control Module Replacement - Front Seat Cushion
Scheme 21
| Callout | Component Name |
|---|---|
| Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| Front Seat Back Cover Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Cover Assembly, Front Seat Back |
| Front Seat Back Climate Control Heated Ventilated Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 4 | Pad Assembly, Front Seat Back |
| 2 | Climate Control Heat Ventilated Assembly, Front Seat Back Tip: Disconnect the electrical connector. |
| Front Seat Back Pad Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Cover Assembly, Front Seat Back |
| 4 | Pad Assembly, Front Seat Back |
| Front Seat Back Blower Assembly Replacement Preliminary Procedure: Remove the front seat. Refer to Seat Replacement - Bucket . | |
| 1 | Cover Assembly, Front Seat Back |
| 4 | Pad Assembly, Front Seat Back |
| 6 | Blower Assembly, Front Seat Back Tip: Disconnect the electrical connectors. |
Trim Cover, Heater, Pad, Blower Replacement - Front Seat Back
Scheme 22
| Callout | Component Name |
|---|---|
| NOTE: Refer to Fastener Notice in Cautions and Notices. Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| Front Seat Back Frame Assembly Replacement Preliminary Procedures Remove the front seat. Refer to Seat Replacement - Bucket . Remove the front seat cushion frame. Refer to Frame, Trim Cover, Heater, Pad, Blower, Power Adjuster Control Module Replacement - Front Seat Cushion . Remove the front seat back pad. Refer to Trim Cover, Heater, Pad, Blower Replacement - Front Seat Back . | |
| 1 | Nut, Adjuster Seat Back Frame (Qty: 4) Tighten: 25 N.m (18 lb ft) |
| 2 | Frame Assembly, Front Seat Back Tip: Disconnect the electrical connectors. |
| Front Seat Adjuster Assembly Replacement Preliminary Procedures Remove the front seat. Refer to Seat Replacement - Bucket . Remove the front seat cushion frame. Refer to Frame, Trim Cover, Heater, Pad, Blower, Power Adjuster Control Module Replacement - Front Seat Cushion . | |
| 1 | Nut, Adjuster Seat Back Frame (Qty: 4) Tighten: 25 N.m (18 lb ft) |
| 4 | Plate, Front Seat Belt Anchor |
| 3 | Adjuster Assembly, Front Seat Cushion Tip: Disconnect the electrical connectors. |
| NOTE |
|---|
| Refer to Fastener Notice in Cautions and Notices. |
Seat Belt Anchor, Back Frame, Power Adjuster with Frame Replacement - Front Seat
Scheme 23
| Callout | Component Name |
|---|---|
| Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| 1 | Cover Assembly, Front Head Restraint |
| 2 | Pad Assembly, Front Head Restraint |
| 3 | Support Assembly, Front Head Restraint |
| 4 | Guide Assembly, Head Restraint |
| 5 | Head Restraint Assembly, Rear |
| 6 | Guide Assembly, Rear Head Restraint |
Trim Cover, Pad, Support, Guide Replacement - Seat Head Restraint
Scheme 24
| Callout | Component Name |
|---|---|
| Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . | |
| Rear Seat Back Cushion Cover Assembly Replacement Preliminary Procedures Remove the rear seat cushion. Refer to Seat Cushion Replacement - Rear . Remove the rear seat back. Refer to Seat Back Replacement - Rear . | |
| 1 | Cover Assembly, Rear Seat Back Cushion |
| Rear Seat Back Wire Frame Assembly Replacement Preliminary Procedures Remove the rear seat cushion. Refer to Seat Cushion Replacement - Rear . Remove the rear seat back. Refer to Seat Back Replacement - Rear . | |
| 1 | Cover Assembly, Rear Seat Back Cushion |
| 2 | Wire Assembly, Rear Seat Back |
| Rear Seat Back Pad Assembly Replacement Preliminary Procedures Remove the rear seat cushion. Refer to Seat Cushion Replacement - Rear . Remove the rear seat back. Refer to Seat Back Replacement - Rear . | |
| 1 | Cover Assembly, Rear Seat Back Cushion |
| 3 | Pad Assembly, Rear Seat Back |
| Rear Seat Back Heater Control Module Assembly Replacement | |
| 4 | Module Assembly, Rear Seat Heater Control Tip: Module can be removed with the seat in the vehicle. |
| Rear Seat Back Harness Assembly Replacement Preliminary Procedures Remove the rear seat cushion. Refer to Seat Cushion Replacement - Rear . Remove the rear seat back. Refer to Seat Back Replacement - Rear . | |
| 5 | Harness Assembly, Lower Rear Seat Back |
Seat Heater Control Module, Pad, Wire Harness, Frame Replacement - Rear Seat Back
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.
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
- Lumbar switch
- Memory seat module (MSM)
- Lumbar horizontal motor
- Lumbar vertical motor
- Lumbar horizontal position sensor
- Lumbar vertical position sensor
- 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
- Lumbar Switch
- Lumbar Horizontal Motor
- Lumbar Vertical Motor
- PWR SEAT Circuit Breaker 30 A
- 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
- Lumbar Switch
- Memory seat module (MSM)
- Instrument panel module (IPM)
- Lumbar horizontal motor
- Lumbar vertical motor
- Lumbar horizontal position sensor
- Lumbar vertical position sensor
- 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.
Helpful Hints
- The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.
- The vented seat is also referenced as the cooled seat for this vehicle.
- 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.
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.
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
- Rear auxiliary HVAC control module
- Right Heated Seat Switch
- Left seat cushion heating element
- Left seat back heating element
- Left seat cushion temperature sensor
- Right seat cushion heating element
- Right seat back heating element
- Right seat cushion temperature sensor
- 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.
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.
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
- Recall immediately upon receipt of the RKE message
- 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.