GM Service Manual Online
For 1990-2009 cars only

Power Seat Inoperative w/o Memory

Step

Action

Yes

No

Schematic Reference: Passenger Seat Schematics and 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 - Power Seats

2

Verify the condition is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

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 .

Is the repair complete?

Go to Step 9

--

6

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

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 .

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

2

Verify the condition is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

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 .

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 .

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 .

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 .

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 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