GM Service Manual Online
For 1990-2009 cars only

Power Seat Inoperative w/o Memory

Step

Action

Yes

No

Schematic Reference: Power Seats Schematics

Connector End View Reference: Power Seat Connector End Views

DEFINITION: One or more of the driver or passenger 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

Attempt to operate all of the seat adjuster motors through their full range of adjustment.

Do all of the power seat adjuster motors operate properly?

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

Go to Step 3

3

Are all of the power seat functions inoperative?

Go to Step 4

Go to Step 6

4

Test the battery positive voltage supply circuit to the seat adjuster switch for an open or short to ground. 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 5

5

Test the seat adjuster switch ground 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 6

6

  1. Disconnect the inoperative adjuster motor connector.
  2. Connect a test lamp across the inoperative adjuster motor control circuit terminals.
  3. Press the inoperative seat adjuster switch in both directions.

Does the test lamp illuminate when the switch is pressed in both directions?

Go to Step 8

Go to Step 7

7

  1. Disconnect the power seat switch connector.
  2. Test the inoperative adjuster motor control circuits for an open or short to ground. 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 10

8

Inspect for poor connections at the seat adjuster motor assembly. 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 9

9

Replace the seat adjuster motor assembly. Refer to Front Seat Adjuster Replacement .

Did you complete the replacement?

Go to Step 12

--

10

Inspect for poor connections at the seat adjuster switch. 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

11

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

Is the repair complete?

Go to Step 12

--

12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Power Seat Inoperative with Memory

Step

Action

Yes

No

Schematic Reference: Memory Seats Schematics

Connector End View Reference: Power Seat Connector End Views

DEFINITION: One or more of the memory seat functions are inoperative and no DTCs are set.

1

Did you perform the Power Seat Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

Attempt to operate all of the memory seat adjustments through their full range.

Do all of the memory seat functions operate properly?

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

Go to Step 3

3

  1. Install a scan tool.
  2. Display the memory seat module Input/Output data list.
  3. Disconnect the seat adjuster switch connector.
  4. Connect a test lamp from the adjuster switch 12-volt reference circuit terminal in the harness connector to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Connect a fused jumper wire from the 12-volt reference circuit terminal to the inoperative switch signal circuit terminal in the adjuster switch harness connector.

Does the scan tool indicate the appropriate switch status as active?

Go to Step 7

Go to Step 6

5

Test the adjuster switch 12-volt reference circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

6

Test the inoperative switch signal circuit for an open or short to ground. Refer to Circuit Testing and to 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 seat adjuster switch. 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 11

Go to Step 9

8

Inspect for poor connections at the memory seat module. 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 11

Go to Step 10

9

Replace the seat adjuster switch. Refer to Driver Seat Adjuster Memory Switch Replacement .

Is the repair complete?

Go to Step 11

--

10

Replace the memory seat module. Refer to Memory Seat Control Module Replacement .

Is the repair complete?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3