GM Service Manual Online
For 1990-2009 cars only

Power Seat Inoperative w/o Memory

Step

Action

Yes

No

Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics

Connector End View Reference: Power Seat Connector End Views

DEFINITION: All of the seat adjuster motors are inoperative, the lumbar and bolster motors may also be inoperative.

1

Did you review the Power Seats System Description and Operation?

Go to Step 2

Go to Symptoms - Seats

2

Verify the condition is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the seat adjuster switch connector.
  2. Connect a test lamp from the battery voltage supply circuit terminal in the harness connector to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Connect a test lamp from the battery voltage supply circuit terminal to the ground circuit terminal in the seat adjuster switch harness connector.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

5

Repair the battery voltage supply circuit for an open or short to ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 9

--

6

Repair the ground circuit for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 9

--

7

Inspect for poor connections at the seat adjuster switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

8

Replace the seat adjuster switch. Refer to Power Seat Switch Replacement .

Is the repair complete?

Go to Step 9

--

9

Operate the system to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Power Seat Inoperative with Memory

Step

Action

Yes

No

Schematic Reference: Driver Seat Schematics

Connector End View Reference: Power Seat Connector End Views

DEFINITION: All of the seat adjuster motors are inoperative, the lumbar and bolster motors may also be inoperative.

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 the condition is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Install a scan tool.
  2. Observe the Seat Adjuster Switch parameters in the driver seat module (DSM) Input/Output data list.

Do all of the Seat Adjuster Switch parameters display Active?

Go to Step 7

Go to Step 4

4

Operate the seat adjuster switches in both directions.

Does the scan tool display the correct switch status parameters in relation to the actual switch positions?

Go to Step 9

Go to Step 5

5

  1. Disconnect the seat adjuster switch connector.
  2. Using a DMM test for battery voltage at the switch supply voltage circuit terminal in the harness connector.

Is battery voltage present on the switch supply voltage circuit?

Go to Step 8

Go to Step 6

6

Test the switch supply voltage circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

7

  1. Disconnect the seat adjuster switch connector.
  2. Test the active switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the seat adjuster switch connector. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the DSM connectors. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

10

Replace the seat adjuster switch. Refer to Power Seat Switch Replacement

Is the repair complete?

Go to Step 12

--

11

Replace the DSM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Is the repair complete?

Go to Step 12

--

12

Operate the system to verify the repair.

Did you correct the condition?

System OK

Go to Step 3