Power Seat System Cadillac ATS I

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptors

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit Description

The seat memory control module monitors the position of the seat motors by using hall effect position sensors which are an internal part of each motor. The module supplies each sensor with a 12 V reference circuit only when any seat motor is active, and a low side signal circuit. During seat motor operation, the hall effect position sensor provides a determined number of pulse signals for every revolution of the motor shaft. The scan tool displays these pulse signals as counts that range from 0-65,535. The module counts the feedback pulses from each sensor to determine seat position and end of travel limits for each of the seat motors. High scan tool count values indicate forward or upward seat positions while low count values indicate rearward or downward seat positions.

Conditions for Running the DTC

1. Any seat motor must be active.
2. DTC B1325 must not be present.
3. Module battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The seat memory control module does not detect position sensor movement or pulse signals while the adjuster motor is active. The following conditions will set this DTC

B1405 02

The seat memory control module detects a short to ground or an open on the 12 V reference circuit.

B1825 01, B2355 01, B2365 01, or B2375 01

The seat memory control module detects a voltage greater than 5 V on the sensor signal circuit.

B1825 06, B2355 06, B2365 06, or B2375 06

The seat memory control module detects a short to ground or an open on the sensor signal circuit.

Action Taken When the DTC Sets

1. With a short to ground or an open circuit, the seat memory control module disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to manual position commands.
2. With a short to battery voltage, the seat memory control module disables the memory recall and easy exit/entry action commands for all four seat motors. The motors will respond to manual position commands.

Conditions for Clearing the DTC

1. The current DTC clears when the fault is no longer present and the power mode changes to OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate driver seat motor listed below for which the DTC set: M50D Seat Front Vertical Motor - Driver M55D Seat Rear Vertical Motor - Driver M51D Seat Horizontal Motor - Driver M56D Seat Recline Motor - Driver
2. Ignition ON.
3. Test for greater than 10.8 V between the 12 V reference circuit terminal 2 and ground while pressing any power seat switch. If 10.8 V or less Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module. Test for infinite resistance between the 12 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 12 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If greater than 10.8 V
4. Test for 0.2-2 V between the signal circuit terminal 4 and ground. If less than 0.2 V Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If greater than 2 V Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, ignition ON. Test for less than 1 V between each signal circuit listed below and ground. Front vertical sensor terminal 12 Seat horizontal sensor terminal 11 Rear vertical sensor terminal 25 Seat recline sensor terminal 26 If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K40 Seat Memory Control Module. If between 0.2-2 V
5. Test or replace the seat motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Seat Tilt Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Driver or Passenger Seat Vertical Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
3. «Front Seat Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
4. «Driver or Passenger Seat Recliner Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
5. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The seat memory control module supplies a reference voltage to each signal circuit of the driver seat adjuster switch. When the power seat or lumbar/bolster switches are pressed, the appropriate signal circuit from the seat memory control module is pulled low through the switch contacts indicating the power seat command. The seat memory control module then commands the driver seat or lumbar/bolster to move in response to the switch signals.

1. DTC B1325 must not be present.
2. Module battery voltage must be between 9-16 V.

1. If a seat or lumbar/bolster switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.
2. A short to ground on a switch signal circuit.

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 seat memory control module will respond to any other switch signal that has not set a DTC.

1. The current DTC will clear and set the DTC to history, when the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

1. If one of the switch signal circuits is shorted to ground, multiple DTCs will set.
2. If a switch is stuck in one direction and the switch is pressed in the opposite direction, a single DTC will set.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify the scan tool seat switch parameters listed below change between Inactive and Forward/Rearward, UP/Down, or Inflate/Deflate when pressing the appropriate seat directional switch. Driver Seat Cushion Front Vertical Switch Driver Seat Cushion Rear Vertical Switch Driver Seat Horizontal Switch Driver Seat Back Switch Driver Lumbar Support Horizontal Switch Driver Seat Cushion Bolster Switch If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
3. All OK.

1. Ignition OFF, disconnect the X1 and X2 harness connectors at the S64D Seat Adjuster Switch - Driver.
2. Verify that all scan tool driver seat switch parameters listed below are Inactive: Driver Seat Cushion Front Vertical Switch Driver Seat Cushion Rear Vertical Switch Driver Seat Horizontal Switch Driver Seat Back Switch Driver Lumbar Support Horizontal Switch Driver Seat Cushion Bolster Switch If not Inactive Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, ignition ON. Test for infinite resistance between the appropriate signal circuit terminal listed below and ground: Front vertical up switch terminal 1 X1 Front vertical down switch terminal 5 X1 Rear vertical up switch terminal 8 X1 Rear vertical down switch terminal 10 X1 Horizontal forward switch terminal 3 X1 Horizontal rearward switch terminal 7 X1 Recline forward switch terminal 4 X1 Recline rearward switch terminal 9 X1 Driver seat side bolster inflate terminal 1 X2 Driver seat side bolster deflate terminal 5 X2 Driver seat lumbar forward terminal 2 X2 Driver seat lumbar rearward terminal 6 X2 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K40 Seat Memory Control Module. If Inactive
3. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and the ground circuit terminal 6 X1. Front vertical up switch terminal 1 X1 Front vertical down switch terminal 5 X1 Rear vertical up switch terminal 8 X1 Rear vertical down switch terminal 10 X1 Horizontal forward switch terminal 3 X1 Horizontal rearward switch terminal 7 X1 Recline forward switch terminal 4 X1 Recline rearward switch terminal 9 X1 Driver seat side bolster inflate terminal 1 X2 Driver seat side bolster deflate terminal 5 X2 Driver seat lumbar forward terminal 2 X2 Driver seat lumbar rearward terminal 6 X2
4. Verify the appropriate scan tool seat switch parameter is Forward/Rearward, UP/Down, or Inflate/Deflate. If not Forward/Rearward, UP/Down, or Inflate/Deflate Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If Forward/Rearward, UP/Down, or Inflate/Deflate
5. Test or replace the S64D Seat Adjuster Switch - Driver.

Component Testing

Seat Adjuster Switch Test

1. Ignition OFF, disconnect the X1 and X2 harness connectors at the S64D Seat Adjuster Switch - Driver.
2. Test for infinite resistance between the ground terminal 6 and each signal terminal with the switch in the open position. If less than infinite resistance Replace the S64D Seat Adjuster Switch - Driver. If infinite resistance
3. Test for less than 2 ohms between the ground terminal 6 and each signal terminal with the appropriate switch in the closed position. If 2 ohms or greater Replace the S64D Seat Adjuster Switch - Driver. If less than 2 ohms
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Adjuster Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Low reference is supplied to the driver seat memory switch from the seat memory control module. When a memory switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.

1. DTC B1327 must not be present.
2. Battery voltage must be between 9-16 V.

B2755 00

The seat memory control module detects a stuck memory switch for a given amount of time.

B2755 01

If the seat memory control module detects a short to voltage on the memory switch signal circuit this DTC will set.

B2755 02

If the seat memory control module detects a short to ground on the memory set switch signal circuit this DTC will set.

B2765 02

If the memory set switch signal is active for greater than 30 s, the module will set this DTC.

Actions Taken When the DTC Sets

1. Current and history DTCs are set.
2. All memory recall commands and are ignored.

Conditions for Clearing the DTCs

1. The DTC automatically clears when the switch circuit setting the DTC is no longer active.
2. A history DTC will clear once 50 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Seat Memory Control Module Memory Recall Switches parameter changes between Inactive and Memory 1 when pressing the memory 1 switch. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
3. Verify the scan tool Seat Memory Control Module Memory Recall Switches parameter changes between Inactive and Memory 2 when pressing the memory 2 switch. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
4. Verify the scan tool Memory Recall Switches parameter changes between Inactive and Exit when pressing the EXIT switch. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
5. Verify the scan tool Memory Recall Switches parameter changes between Inactive and Set when pressing the SET switch. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
6. All OK.

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver, ignition ON.
2. Press a power seat switch in order to wake up the K40 Seat Memory Control Module.
3. Test for 9 V or greater between each signal circuit terminal listed below and ground: Memory set switch signal terminal 5 Memory switch signal terminal 6 If less than 9 V Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If 9 V or greater
4. Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory Control Module, ignition ON.
5. Test for less than 1 V between each signal circuit terminal listed below and ground: Memory set switch signal terminal 5 Memory switch signal terminal 6 If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
6. Test or replace the S47D Seat Memory Switch - Driver.

Driver Seat Memory Switch

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver.
2. Test for infinite resistance between each signal terminal listed below and the low reference terminal 1 with the switch in the open position. Terminal 5 Terminal 6 If less than infinite resistance Replace the S47D Seat Memory Switch - Driver. If infinite resistance
3. Test for less than 4 ohms between the signal terminal 5 and the low reference terminal 1 while pressing the memory SET button. If 4 ohms or greater Replace the S47D Seat Memory Switch - Driver. If less than 4 ohms
4. Test for 573-701 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 1 button. If not between 573-701 ohms Replace the S47D Seat Memory Switch - Driver. If between 573-701 ohms
5. Test for 1800-2201 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 2 button. If not between 1800-2201 ohms Replace the S47D Seat Memory Switch - Driver. If between 1800-2201 ohms
6. Test for 5.52k-6.73 kohms between the signal terminal 6 and the low reference terminal 1 while pressing the Exit button. If not between 5.52k-6.73 kohms Replace the S47D Seat Memory Switch - Driver. If between 5.52k-6.73 kohms
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver Seat Adjuster Memory Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The seat memory control module controls the seat motors, lumbar/bolster pump motor via half bridges that are connected to power rails internal to the module. The seat memory control module connects all of the motor control circuits on each power rail to a common reference point. The module monitors all seat motor control circuits for a shorted to ground or battery before enabling any seat motor.

When a power seat switch is pressed or when a memory recall is requested, each seat motor receives battery voltage and ground from the seat memory control module via the motor control circuits. All motors are reversible, so the direction the motor rotates depends on which control circuit voltage is applied and which control circuit ground is applied. When the switch is operated in the opposite direction, the module reverses the polarity and applies voltage and ground to the opposite circuits to move the seat in the opposite direction.

1. DTC B1325 must not be present.
2. Module battery voltage must be between 9-16 V.

B3920 00

Current out of the module does not match the current returning to the module from 1.5-5 A.

B3920 01

The voltage on any power rail 1 motor control circuit exceeds 2.78 V for 100 ms.

B3920 02

The voltage on any power rail 1 motor control circuit is below 1.47 V for 100 ms.

B3920 0B

The differential current measured through the high and low side of the power rail is within tolerance of each other, but the absolute current or an over-current has exceeded the maximum value.

The seat memory control module will not allow operation of any motor on the power rail for which the DTC was set.

1. The current DTC clears when the fault is no longer present and the power mode changes to OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

B3920 01 or B3920 02

1. Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module.
2. Test for infinite resistance between each control circuit terminal listed below and ground: Driver seat front vertical motor up control terminal 3 Driver seat front vertical motor down control terminal 4 Driver seat rear vertical motor up control terminal 5 Driver seat rear vertical motor down control terminal 6 Driver seat horizontal motor forward control terminal 11 Driver seat horizontal motor rearward control terminal 12 Driver seat recline motor forward control terminal 1 Driver seat recline motor rearward control terminal 2 Driver seat lumbar forward control terminal 7 Driver seat lumbar rearward control terminal 8 Driver seat side bolster inflate control terminal 9 Driver seat side bolster deflate control terminal 10 If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
3. Ignition ON.
4. Test for less than 1 V between each control circuit terminal listed below and ground: Driver seat front vertical motor up control terminal 3 Driver seat front vertical motor down control terminal 4 Driver seat rear vertical motor up control terminal 5 Driver seat rear vertical motor down control terminal 6 Driver seat horizontal motor forward control terminal 11 Driver seat horizontal motor rearward control terminal 12 Driver seat recline motor forward control terminal 1 Driver seat recline motor rearward control terminal 2 Driver seat lumbar forward control terminal 7 Driver seat lumbar rearward control terminal 8 Driver seat side bolster inflate control terminal 9 Driver seat side bolster deflate control terminal 10 If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
5. Replace the K40 Seat Memory Control Module.

B3920 00 or B3920 0B

1. Ignition ON.
2. Clear the current and history DTC.
3. Determine which motor set this DTC by operating the driver seat motors and the lumbar support pump listed below one at a time in both directions. Check for the DTC to set between each motor test. M50D Seat Front Vertical Motor - Driver M55D Seat Rear Vertical Motor - Driver M51D Seat Horizontal Motor - Driver M56D Seat Back Recline Motor - Driver G31D Seat Lumbar/Bolster Pump - Driver
4. Ignition OFF, disconnect the harness connector at the seat or lumbar/bolster motor for which the DTC set, ignition ON.
5. Clear the DTC.
6. Verify that DTC B3920 00 or B3920 0B does not set while operating the seat or lumbar adjuster switch in both directions. If DTC B3920 00 or B3920 0B sets Test for infinite resistance between the control circuits. If less than infinite resistance, repair the short between the circuits. If infinite resistance Test for less than 2 ohms in each control circuit end to end: If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the seat or lumbar/bolster motor. If DTC B3920 00 or B3920 0B does not set
7. Test or replace the seat or lumbar/bolster motor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Seat Tilt Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Driver or Passenger Seat Vertical Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
3. «Front Seat Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
4. «Driver or Passenger Seat Recliner Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
5. «Driver or Passenger Seat Lumbar Support Replacement (With AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Lumbar Support Replacement (Without AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery)
6. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

Symptoms - Power Seats

Note. The following steps must be completed before using the symptom tables.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following system descriptions: «Lumbar Support Description and Operation»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system__lumbar-support-description-and-operation) «Memory Seats Description and Operation»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system__memory-seats-description-and-operation) «Power Seats System Description and Operation»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system__power-seats-system-description-and-operation) «Seat Side Bolster Description and Operation»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system__seat-side-bolster-description-and-operation)

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

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

Symptom List

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

1. «Lumbar/Bolster Malfunction (Without AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) , «Lumbar/Bolster Malfunction (With AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Memory Seat Feature Malfunction»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
3. «Power Seat Malfunction (With Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) , «Power Seat Malfunction (Without Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery voltage is supplied at all times to the seat adjuster switch through a 30 A fuse located in the underhood fuse block. When a lumbar switch is pressed to inflate the lumbar support, battery voltage is applied through the switch contacts and the inflate control circuit to the seat lumbar support pump. In response to this signal, the pump energizes its internal inflate solenoid and runs to inflate the lumbar bladder until the switch is released. When the switch is pressed to deflate the lumbar support, battery voltage is applied through the switch contacts and the deflate signal circuit to the seat lumbar support pump. The pump energizes its internal deflate solenoid and air is released from the bladder until the switch is released.

Schematic Reference

1. «Driver Seat Schematics»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Passenger Seat Schematics»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Lumbar Support Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

1. Ignition ON.
2. Verify that all power seat functions operate when being controlled by the S64 Seat Adjuster Switches. If any power seat function does not operate Refer to «Power Seat Malfunction (With Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) , «Power Seat Malfunction (Without Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) . If all power seat functions operate
3. Verify the lumbar support pump turns ON when the lumbar support switch is pressed in the FORWARD direction. The lumbar support bladder should inflate until the bladder is 100% inflated or the switch is released. If the pump does not turn ON or the bladder does not inflate Refer to Circuit/System Testing If the pump turns ON and the bladder inflates
4. Verify the lumbar support bladder deflates when the lumbar REARWARD switch is pressed. The bladder should deflate until it is 100% deflated or the switch is released If the bladder does not deflate Refer to Circuit/System Testing If the bladder deflates
5. All OK.

1. Ignition OFF, disconnect the harness connector at the appropriate A14 Seat Lumbar Support Pump.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Test for less than 10 ohms between each control circuit terminal listed below and ground. Lumbar forward switch signal terminal 5 Lumbar rearward switch signal terminal 2 If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the S64 Seat Adjuster Switch. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S64 Seat Adjuster Switch. If less than 10 ohms
4. Connect a test lamp between each signal circuit terminal listed below and ground one at a time, ignition ON: Lumbar forward switch signal terminal 5 Lumbar rearward switch signal terminal 2
5. Verify the test lamp turns ON and OFF when pressing and releasing the appropriate lumbar switch. If the test lamp remains OFF Ignition OFF, disconnect the X2 harness connector at the S64 Seat Adjuster Switch. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the S64 Seat Adjuster Switch. If the test lamp remains ON Ignition OFF, disconnect the X2 harness connector at the S64 Seat Adjuster Switch, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S64 Seat Adjuster Switch. If the test lamp turns ON and OFF
6. Test or replace the A14 Seat Lumbar Support Pump.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Adjuster Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Driver or Passenger Seat Lumbar Support Replacement (With AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Lumbar Support Replacement (Without AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The seat memory control module supplies a reference voltage to each signal circuit of the driver seat adjuster switch. When the lumbar/bolster switches are pressed, the appropriate signal circuit from the seat memory control module is pulled low through the switch contacts indicating the seat lumbar/bolster support command. The control module then applies battery voltage through the control circuit to the seat lumbar/bolster pump. The pump energizes its internal inflate solenoid and the pump runs to inflate the bladder until the switch is released. When the lumbar/bolster switch is pressed to deflate the lumbar/bolster bladder, the signal circuit from the seat memory control module is pulled low indicating the deflate command. Battery voltage is applied through the deflate control circuit to the seat lumbar/bolster pump. The pump energizes its internal deflate solenoid and air is released from the bladder until the switch is released.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Lumbar Support Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that no power seat DTCs are set. If any power seat DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no power seat DTCs are set
3. Verify that all power seat functions operate when being controlled by the S64 Seat Adjuster Switches. If any power seat function does not operate Refer to «Power Seat Malfunction (With Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) , «Power Seat Malfunction (Without Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) . If all power seat functions operate
4. Refer to Circuit/System Testing.

1. Ignition OFF, disconnect the X2 harness connector at the S64D Seat Adjuster Switch - Driver, ignition ON.
2. Test for 5-12 V between the appropriate signal circuit terminal listed below and ground. Seat side bolster inflate terminal 1 Seat side bolster deflate terminal 5 Lumbar forward terminal 2 Lumbar rearward terminal 6 If not between 5-12 V Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module. Test for Infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If between 5-12 V
3. Ignition OFF, connect the X2 harness connector at the S64D Seat Adjuster Switch - Driver and disconnect the harness connector at the G31D Seat Lumbar/Bolster Pump - Driver.
4. Connect a test lamp between the appropriate control circuit terminals listed below, ignition ON. Seat side bolster terminal 2 and terminal 4. Lumbar terminal 3 and terminal 5
5. Verify the test lamp turns ON when pressing the appropriate switch in both directions. If test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X6 harness connector at the K40 Seat Memory Control Module, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms between each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If the test lamp turns ON during each of the commands
6. Test or replace the G31D Seat Lumbar/Bolster Pump - Driver.

Lumbar Support Switch

1. Ignition OFF, disconnect the X1 and X2 harness connector at the S64D Seat Adjuster Switch - Driver.
2. Test for infinite resistance between the ground terminal 6 X1 and each lumbar signal terminal with the switch in the open position. If less than infinite resistance Replace the S64D Seat Adjuster Switch - Driver. If infinite resistance
3. Test for less than 2 ohms between the ground terminal 6 X1 and each lumbar signal terminal with the appropriate switch in the closed position. If 2 ohms or greater Replace the S64D Seat Adjuster Switch - Driver. If less than 2 ohms
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Adjuster Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Driver or Passenger Seat Lumbar Support Replacement (With AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Lumbar Support Replacement (Without AHE)»(/cadillac/ats/i-2012-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery)
3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Low reference is supplied to the driver seat memory switch from the seat memory control module. When a memory switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.

The seat memory control module must be awake when measuring voltage from either one of the memory seat switch signal circuits. Voltage readings of 0.0 V or 5 V are possible if the module is not fully awake and result in misdiagnosing the circuit.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that all manual driver power seat functions operate when being controlled by the power seat adjuster switches. If any seat function does not operate Refer to «Power Seat Malfunction (With Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) , «Power Seat Malfunction (Without Memory A45)»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system) If all seat functions operate
3. Verify that the memory recall personalization option is ON. Refer to the owners manual. If the memory recall personalization option is not ON Turn ON the option, refer to the Owners Manual. If the memory recall personalization option is ON
4. Refer to Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver.
2. Test for less than 30 ohms between the low reference circuit terminal 1 and ground. If 30 ohms or greater Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory Control Module. Test for less than 2 ohms in the low reference circuit end to end If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If less than 30 ohms
3. Ignition ON, press a power seat switch in order to wake up the K40 Seat Memory Control Module.
4. Test for 9 V or greater between each signal circuit terminal listed below and ground: Memory set switch signal terminal 5 Memory switch signal terminal 6 If less than 9 V Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If 9 V or greater
5. Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory Control Module, ignition ON.
6. Test for less than 1 V between each signal circuit terminal listed below and ground: Memory set switch signal terminal 5 Memory switch signal terminal 6 If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
7. Test or replace the S47D Seat Memory Switch - Driver.

Driver Seat Memory Switch

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver.
2. Test for infinite resistance between each signal terminal listed below and the low reference terminal 1 with the switch in the open position. Terminal 5 Terminal 6 If less than infinite resistance Replace the S47D Seat Memory Switch - Driver. If infinite resistance
3. Test for less than 4 ohms between the signal terminal 5 and the low reference terminal 1 while pressing the memory SET button. If 4 ohms or greater Replace the S47D Seat Memory Switch - Driver. If less than 4 ohms
4. Test for 573-701 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 1 button. If not between 573-701 ohms Replace the S47D Seat Memory Switch - Driver. If between 573-701 ohms
5. Test for 1800-2201 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 2 button. If not between 1800-2201 ohms Replace the S47D Seat Memory Switch - Driver. If between 1800-2201 ohms
6. Test for 5.52k-6.73 kohms between the signal terminal 6 and the low reference terminal 1 while pressing the Exit button. If not between 5.52k-6.73 kohms Replace the S47D Seat Memory Switch - Driver. If between 5.52k-6.73 kohms
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver Seat Adjuster Memory Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery voltage is supplied at all times to the seat memory control module through a fuse located in the underhood fuse block. This voltage is used by the module for logic power. Battery positive voltage is also supplied at all times to the seat memory control module through a circuit breaker located in the instrument panel fuse block. This voltage is connected to a power rail internal to the seat memory control module and is used to drive the power seat motors. Each seat motor is controlled by the seat memory control module by applying power and ground through the control circuits to the motor.

All motors are reversible. For example, when the seat switch is operated to move the entire seat forward, the switch signal circuit from the seat memory control module is pulled low indicating the entire seat forward command. In response to this signal, the seat memory control module applies battery 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 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.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool seat switch parameters listed below change between Inactive and Forward/Rearward or Up/Down when pressing the appropriate switch. Driver Seat Horizontal Switch Driver Seat Cushion Front Vertical Switch Driver Seat Cushion Rear Vertical Switch Driver Seat Back Switch If the parameter does not change Refer to Circuit/System Testing - Seat Adjuster Switch Circuit Test If the parameter changes
3. Verify the seat directional motors listed below operate while operating the appropriate seat switches in both directions. M50D Seat Front Vertical Motor - Driver M55D Seat Rear Vertical Motor - Driver M51D Seat Horizontal Motor - Driver M56D Seat Recline Motor - Driver If any seat motor does not operate Refer to Circuit/System Testing - Seat Motor Control Circuit Test. If all seat motors operate
4. All OK.

Seat Adjuster Switch Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the S64D Seat Adjuster Switch - Driver. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 6 and ground. If 10 ohms or greater Ignition Off. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Install a 3 A fused jumper wire between the ground circuit terminal 6 and the appropriate signal circuit terminal listed below, ignition ON. Front vertical upward switch terminal 1 Front vertical downward switch terminal 5 Rear vertical upward switch terminal 8 Rear vertical downward switch terminal 10 Horizontal forward switch terminal 3 Horizontal rearward switch terminal 7 Recline forward switch terminal 4 Recline rearward switch terminal 9
4. Verify the appropriate scan tool seat switch parameter is Forward/Rearward or UP/Down. If not Forward/Rearward or UP/Down Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If Forward/Rearward or UP/Down
5. Test or replace the S64D Seat Adjuster Switch - Driver.

Seat Motor Control Circuit Test

1. Ignition OFF, disconnect the X2 harness connector at the K40 Seat Memory Control Module.
2. Test for less than 10 ohms between ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition OFF, disconnect the X1 harness connector at the K40 Seat Memory Control Module, ignition ON.
4. Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is OK. Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open. Ignition OFF, remove the test lamp. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the shot to ground on the circuit. If infinite resistance, replace the K40 Seat Memory Control Module. If the test lamp illuminates.
5. Ignition OFF, connect the X1 harness connector at the K40 Seat Memory Control Module and disconnect the harness connector at the appropriate seat motor listed below: M50D Seat Front Vertical Motor - Driver M55D Seat Rear Vertical Motor - Driver M51D Seat Horizontal Motor - Driver M56D Seat Recline Motor - Driver
6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
7. Verify the test lamp turns ON when commanding the seat motor in the Up/Down or Forward/Rearward states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K40 Seat Memory Control Module. If the test lamp turns ON during each of the commands
8. Test or replace the seat motor.

Seat Adjuster Switch Test

1. Ignition OFF, disconnect the X1 and X2 harness connectors at the S64D Seat Adjuster Switch - Driver.
2. Test for infinite resistance between the ground terminal 6 and each signal terminal with the switch in the open position. If less than infinite resistance Replace the S64D Seat Adjuster Switch - Driver. If infinite resistance
3. Test for less than 2 ohms between the ground terminal 6 and each signal terminal with the appropriate switch in the closed position. If 2 ohms or greater Replace the S64D Seat Adjuster Switch - Driver. If less than 2 ohms
4. All OK.

Seat Motor

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below: M50D Seat Front Vertical Motor - Driver M55D Seat Rear Vertical Motor - Driver M51D Seat Horizontal Motor - Driver M56D Seat Recline Motor - Driver
2. Install a 30 A fused jumper wire between control terminal 1 and 12 V.
3. Momentarily install a jumper wire between control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/ REARWARD/ UP/ DOWN function. If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function Replace the seat motor. If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function
4. Reverse the jumper wires; the motor should perform FORWARD/ REARWARD/ UP/ DOWN function. If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function Replace the seat motor. If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Adjuster Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Front Seat Tilt Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
3. «Driver or Passenger Seat Vertical Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
4. «Front Seat Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
5. «Driver or Passenger Seat Recliner Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
6. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K40 Seat Memory Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The driver seat without memory and the passenger seat are completely controlled through their respective seat adjuster switches. Battery voltage is supplied at all times to the seat adjuster switch through a circuit breaker located in the instrument panel fuse block. When the seat switches are in an inactive state, the switch contacts are closed to the switch ground circuit.

All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, battery voltage is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. With the horizontal motor rearward switch contacts closed to the switch ground circuit, 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 voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.

Schematic Reference

1. «Driver Seat Schematics»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Passenger Seat Schematics»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Seats System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

1. Verify the appropriate driver or passenger seat directional motors listed below operate while operating the seat switches in both directions. M51 Seat Horizontal Motor M50 Seat Front Vertical Motor (with 8-way seat) M55 Seat Rear Vertical Motor (with 8-way seat) M57 Seat Vertical Motor (with 6-way seat) M56 Seat Recline Motor If all seat motors do not operate Refer to Circuit/System Testing - Seat Adjuster Switch Circuit Test. If 1 or more seat motors operate but not all Refer to Circuit/System Testing - Seat Motor Circuit Test. If all seat motors operate
2. All OK.

Seat Adjuster Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch.
2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. Driver seat terminal 2 Passenger seat terminal 5 If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the appropriate B+ circuit terminal listed below and ground. Driver seat terminal 6 Passenger seat terminal 10 If the test lamp does not illuminate Ignition OFF Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the circuit breaker is not open and there is voltage at the circuit breaker. If the test lamp illuminates
5. Test or replace the S64 Seat Adjuster Switch.

Seat Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below: M51 Seat Horizontal Motor M50 Seat Front Vertical Motor (with 8-way seat) M55 Seat Rear Vertical Motor (with 8-way seat) M57 Seat Vertical Motor (with 6-way seat) M56 Seat Recline Motor
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
3. Verify the test lamp illuminates when commanding the seat motor Up and Down or Forward and Rearward using the seat adjuster switch. If the test lamp does not illuminate during either of the commands Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch. Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S64 Seat Adjuster Switch If the test lamp illuminates during each of the commands
4. Test or replace the seat motor.

Seat Adjuster Switch Test

1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.
2. Test for infinite resistance between the B+ terminal and each control terminal with the switch in the open position. If less than infinite resistance Replace the S64 Seat Adjuster Switch. If infinite resistance
3. Test for less than 2 ohms between the B+ terminal and each control terminal with the appropriate switch in the closed position. If 2 ohms or greater Replace the S64 Seat Adjuster Switch. If less than 2 ohms
4. Test for less than 2 ohms between the ground terminal and each control terminal with the switch in the open position. If 2 ohms or greater Replace the S64 Seat Adjuster Switch. If less than 2 ohms
5. All OK.

Seat Motor

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below: M51 Seat Horizontal Motor M50 Seat Front Vertical Motor (with 8-way seat) M55 Seat Rear Vertical Motor (with 8-way seat) M57 Seat Vertical Motor (with 6-way seat) M56 Seat Recline Motor
2. Install a 30 A fused jumper wire between control terminal 1 and 12 V.
3. Momentarily install a jumper wire between control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/ REARWARD/ UP/ DOWN function. If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function Replace the motor. If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function
4. Reverse the jumper wires; the motor should perform FORWARD/ REARWARD/ UP/ DOWN function. If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function Replace the motor. If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Adjuster Switch Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
2. «Front Seat Tilt Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
3. «Driver or Passenger Seat Vertical Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
4. «Front Seat Adjuster Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)
5. «Driver or Passenger Seat Recliner Actuator Replacement»(/cadillac/ats/i-2012-2014/remont/seats/#power-seat-system)

Scheme 67

Driver or Passenger Seat Adjuster Switch Replacement

Scheme 68

Driver Seat Adjuster Memory Switch Replacement

Scheme 69

Driver or Passenger Seat Adjuster Memory Module Replacement

Scheme 70

Front Seat Tilt Adjuster Actuator Replacement

Scheme 71

Front Seat Recliner Actuator Shaft Replacement

Scheme 72

Driver or Passenger Seat Vertical Adjuster Actuator Replacement

Scheme 73

Front Seat Adjuster Actuator Replacement

Scheme 74

Front Seat Horizontal Adjuster Position Sensor Replacement

Scheme 75

Driver or Passenger Seat Recliner Actuator Replacement

Lumbar Support Description and Operation

The driver and front passenger pneumatic lumbar support system consists of the following components

1. Seat adjuster switch
2. Seat memory control module (With Memory A45)
3. Seat lumbar support pump
4. Seat lumbar/bolster pump (With Memory A45)

Lumbar Circuit Description without Memory A45

Note. If equipped, the passenger seat block diagram without memory is identical to the driver seat without memory.

Scheme 76

Battery voltage is supplied at all times to the driver and passenger seat adjuster switches through 30 A fuses located in the underhood fuse block. When a lumbar switch is pressed in the forward direction to inflate the lumbar support, battery voltage is applied through the switch contacts and the inflate control circuit while ground is applied through the deflate control circuit to the seat lumbar support pump. The pump runs to inflate the lumbar bladder until the switch is released. When the switch is pressed in the rearward direction to deflate the lumbar support, battery voltage is applied through the switch contacts and the deflate control circuit while ground is applied through the inflate control circuit to the seat lumbar support pump. The pump energizes its internal deflate solenoid and air is released from the lumbar bladder until the switch is released.

Scheme 77

Ground is supplied at all times to the driver seat adjuster switch through the switch ground circuit and ground connection. The seat memory control module supplies a low current voltage to each signal circuit of the seat adjuster switch. When the lumbar switch is pressed in the forward direction to inflate the lumbar support, the lumbar forward signal circuit from the seat memory control module is pulled low through the switch contacts indicating the lumbar inflate command. The seat memory control module then applies battery voltage through the lumbar inflate control circuit and ground through the lumbar deflate control circuit to the seat lumbar/bolster pump. The pump runs to inflate the lumbar support until the switch is released. When the lumbar switch is pressed in the rearward direction, the lumbar rearward signal circuit from the seat memory control module is pulled low indicating the lumbar deflate command. The seat memory control module then applies battery voltage through the lumbar deflate control circuit and ground through the lumbar inflate control circuit to the seat lumbar/bolster pump. The pump energizes its internal deflate solenoid and air is released from the lumbar bladder until the switch is released.

Memory Seats Description and Operation

The memory seat system consists of the following components

1. Driver seat adjuster switch
2. Driver seat memory switch
3. Seat memory control module
4. Driver seat horizontal motor
5. Driver seat front vertical motor
6. Driver seat rear vertical motor
7. Driver seat recline motor
8. Driver seat horizontal motor position sensor
9. Driver seat front vertical motor position sensor
10. Driver seat rear vertical motor position sensor
11. Driver seat recline motor position sensor

Scheme 78

Driver Seat Adjuster Switch

Ground is supplied at all times to the driver seat adjuster switch through the switch ground circuit and ground connection. The seat memory control module supplies a low current voltage to each signal circuit of the seat adjuster switch. When the driver seat adjuster switches are pressed, the appropriate signal circuit from the seat memory control module is pulled low through the switch contacts indicating the power seat command. The seat memory control module then commands the appropriate driver seat motor to move in response to the switch signal.

Seat Memory Control Module Power and Grounds

Battery positive voltage is supplied at all times to the seat memory control module through a 30 A fuse located in the underhood fuse block. This voltage is used by the module to apply power to the driver seat and lumbar motor when commanded ON. Battery positive voltage is also applied at all times to the seat memory control module through a 10 A fuse located in the rear body fuse block. This voltage is used to power up the module, seat adjuster switch signal circuits, and the seat position sensors. Ground is provided to the seat memory control module through the module ground circuit and ground connection.

Seat Motors

There are 4 motors that move the position of the seat. These are the seat horizontal motor, seat front vertical motor, seat rear vertical motor, and the seat back recline motor. The horizontal motor moves the entire seat forward and rearward. The seat front vertical motor moves the front of the seat cushion up or down. The seat rear vertical motor moves the rear of the seat cushion up and down. Due to the seat adjuster switch design the front tilt and the seat height adjuster motor cannot be operated at the same time The recline motor moves the angle of the seat back forward or rearward.

The seat memory control module controls all seat and lumbar motors via half bridges that are connected to a single power rail internal to the module. The module connects all seat and lumbar motor outputs to a common ground whenever they are not in operation. The seat memory control module checks to see if any motor control circuits are shorted to ground or voltage before enabling any seat or lumbar motor. 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.

All seat motors are reversible. For example, when a seat switch is pressed to move the entire seat forward, ground is applied through the switch contacts onto the seat horizontal forward switch signal circuit to the seat memory control module. In response to this signal, the module applies battery 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 voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction. All of the motors are powered this way.

Position Sensors

To monitor seat position, each seat motor has an internal 2-wire hall-effect position sensor. The seat memory control module supplies all the sensors with a common 12 V reference when the seat is moving and a unique signal circuit for each sensor. During seat motor operation, the position sensors provide a specific number of pulse signals for every revolution of the motor shaft.

The seat memory control module determines seat position by keeping a running counter where movement in the forward/upward direction adds counts and movement in the rearward/down direction subtracts counts. The value of the counter will be in the range of 0 - 65,535

The value of these counters, which represent seat positions, are stored in memory for future seat memory recall operation. During a memory seat position recall, the seat memory control module moves the seat in such a way to return it the stored counter value.

Memory Functions

In all power modes except crank, memory recalls can be initiated by pressing and holding one of the memory position buttons until the seat reaches the stored memory position associated with the activated button. This is called a supervised recall.

Un-supervised recalls, a momentary push of memory recall switch, are available when the ignition is ON and the vehicle transmission is the park position.

The seat memory control module supplies a ground at all times through a low reference circuit to the driver seat memory switch. The module also supplies memory set and memory recall signal circuits to the seat memory switch. When a memory recall switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and a series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.

Refer to the Owner's Manual for storing memory positions.

Auto Memory Recall and Easy Exit

The seat memory control module will not perform Auto Memory Seat Recall and Easy Exit functions unless these options are enabled in vehicle personalization using the radio/HVAC controls.

Refer to Instruments and Controls/Vehicle Personalization in the Owner's Manual for the following memory personalization options

1. Auto Memory Recall
2. Easy Exit Options

The radio/HVAC controls reports the auto memory recall option settings to the seat memory control module via serial data message. The module will then store the memory recall option setting and examine it before making a memory seat adjustment. The auto memory recall option setting stored within the module will not change until the auto memory recall option setting in vehicle personalization is changed.

Power Seats System Description and Operation

The driver and passenger power seat systems each consist of the following components

1. Seat adjuster switch
2. Seat horizontal motor
3. Seat front vertical motor (If Equipped)
4. Seat rear vertical motor
5. Seat recline motor

Scheme 79

The seat switches provide both power and ground to the selected seat 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 four seat position motors and two lumbar motors. These are the horizontal motor, front vertical motor, rear vertical motor, and the seat back recline motor. The seat 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.

Seat Operation

All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, battery voltage is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. With the horizontal motor rearward switch contacts closed to the switch ground circuit, 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 voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.

Seat Side Bolster Description and Operation

The driver seat side bolsters system consists of the following components

1. Seat adjuster switch
2. Seat memory control module
3. Seat lumbar/bolster pump

Ground is supplied at all times to the driver seat adjuster switch through the switch ground circuit and ground connection. The seat memory control module supplies a low current voltage to each signal circuit of the seat adjuster switch. When the lumbar/bolster switch is pressed in the up direction to inflate the seat side bolsters, the seat side bolster inflate signal circuit from the seat memory control module is pulled low through the switch contacts indicating the seat side bolster inflate command. The seat memory control module then applies battery voltage through the bolster inflate control circuit and ground through the bolster deflate control circuit to the seat lumbar/bolster pump. The pump runs to inflate the seat back side bolsters until the switch is released. When the lumbar/bolster switch is pressed in the down direction, the seat side bolster deflate signal circuit from the seat memory control module is pulled low indicating the seat side bolster deflate command. The seat memory control module then applies battery voltage through the bolster deflate control circuit and ground through the bolster inflate control circuit to the seat lumbar/bolster pump. The pump energizes its internal deflate solenoid and air is released from the bladders until the switch is released.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Symptom Byte List
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Driver or Passenger Seat Lumbar Support Replacement (With AHE)
• Checking Aftermarket Accessories
• Diagnostic Trouble Code (DTC) List - Vehicle
• Front Side Door Trim Replacement
• Fastener Caution
• SIR Warning
• SIR Disabling and Enabling
• DTC B1405, B1825, B2355, B2365, or B2375
• Memory Seats Description and Operation
• Lumbar Support Description and Operation
• Power Seats System Description and Operation
• Seat Side Bolster Description and Operation