GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat Inoperative

Power Seat Inoperative w/o Memory

Step

Action

Yes

No

Schematic Reference: Power Seats Schematics

DEFINITION: The driver or passenger power seat is inoperative in all modes.

1

Did you review the Power Seats System Description and Operation?

Go to Step 2

Go to Symptoms - Seats

2

Attempt to operate all of the power seat functions.

Are all of the power seat functions inoperative?

Go to Step 3

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

3
  1. Disconnect the seat adjuster switch.
  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 to the seat adjuster switch for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 9

--

6

Repair the seat adjuster switch ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 9

--

7

Inspect for poor connections at the harness connector of the power seat 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 9

Go to Step 8

8

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

Is the repair complete?

Go to Step 9

--

9

Operate the system in order 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: Memory Seats Schematics

DEFINITION: All of the driver memory seat adjuster motors are inoperative from the seat adjuster switch. The memory functions may or may not be inoperative

1

Did you review the Memory Seats System Description and Operation?

Go to Step 2

Go to Symptoms - Seats

2

Using the seat adjuster switch attempt to operate the power seat in all directions.

Are all of the power seat adjuster motors inoperative?

Go to Step 3

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

3
  1. Disconnect the seat adjuster switch.
  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 6

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 5

Go to Step 10

5
  1. Using a DMM test the resistance through the seat adjuster switch from the battery voltage supply circuit terminal to a signal circuit terminal.
  2. Activate the switch function for the signal circuit being measured.

Does the adjuster switch have continuity?

Go to Step 8

Go to Step 14

6
  1. Disconnect the memory seat module connector C3.
  2. Test the battery voltage supply circuit from the memory seat module to the seat adjuster switch for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did find and correct the condition?

Go to Step 16

Go to Step 7

7
  1. Disconnect the memory seat module connector C1.
  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 13

Go to Step 11

8
  1. Disconnect the memory seat module connector C1.
  2. Connect a test lamp from the battery voltage supply circuit terminal to the ground circuit terminal in the memory seat module harness connector C1.

Does the test lamp illuminate?

Go to Step 9

Go to Step 12

9
  1. Disconnect the memory seat module connector C2.
  2. Disconnect all of the hall effect type adjuster motor position sensors.
  3. Test the hall effect position sensor 5-volt reference circuit for a short to ground. Refer to Circuit Testing

    4. and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 13

10

Repair the seat adjuster switch ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

--

11

Repair the battery voltage supply circuit to the memory seat module for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

--

12

Repair the memory seat module ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

--

13

Inspect for poor connections at the harness connectors of 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 16

Go to Step 15

14

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

Is the repair complete?

Go to Step 16

--

15

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

Is the repair complete?

Go to Step 16

--

16

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3