GM Service Manual Online
For 1990-2009 cars only

Power Seat Does Not Recline w/o A45

Step

Action

Yes

No

Schematic Reference: Power Seats Schematics

1

Did you review the power seat system operation and perform the necessary inspection?

Go to Step 2

Go to Symptoms - Seats

2

Verify that the Power Seat Does Not Recline complaint is present.

Does the seat recline system operate as described in the system description and operation?

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

Go to Step 3

3

  1. Connect a test lamp from the seat recline motor rearward control circuit of the recline motor to a good ground.
  2. Operate the seat recline REARWARD switch.

Does the test lamp illuminate?

Go to Step 4

Go to Step 6

4

  1. Connect a test lamp from the seat recline motor forward control circuit of the recline motor to a good ground.
  2. Operate the seat recline FORWARD switch.

Does the test lamp illuminate?

Go to Step 5

Go to Step 7

5

  1. Disconnect the seat recline motor harness connector.
  2. Connect a test lamp between the recline motor forward control circuit and the recline motor rearward control circuit of the motor harness connector.
  3. Operate the seat recline switch in the FORWARD and REARWARD directions.

Does the test lamp illuminate in both directions?

Go to Step 9

Go to Step 8

6

Test the seat recline motor rearward control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

7

Test the seat recline motor forward control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

Inspect for poor connections at the harness connector of the seat adjuster switch. Refer to Testing for Intermittent Conditions and Poor Connections and 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 harness connector of the seat recline motor. Refer to Testing for Intermittent Conditions and Poor Connections and 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 .

Did you complete the replacement?

Go to Step 12

--

11

Replace the seat recline motor. Refer to Front Seat Adjuster Replacement .

Did you complete the replacement?

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 Does Not Recline with A45

Step

Action

Yes

No

Schematic Reference: Memory Seats Schematics

1

Did you perform the Diagnostic System Check - Power Seats Systems?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

Verify that the Power Seat Does Not Recline complaint is present.

Does the power seat recline system operate as described in the system description and operation?

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

Go to Step 3

3

Operate the seat recline switch in the FORWARD and REARWARD directions.

Does the seat recline motor run for approximately 1 second then stop?

Go to Step 13

Go to Step 4

4

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Seat Switches parameter in the Memory Seat Module data list.
  4. Operate the seat recline FORWARD switch.

Does the Seat Switches parameter change state?

Go to Step 5

Go to Step 7

5

  1. With a scan tool, observe the Seat Switches parameter.
  2. Operate the seat recline REARWARD switch.

Does the Seat Switches parameter change state?

Go to Step 6

Go to Step 8

6

  1. Disconnect the seat recline motor harness connector.
  2. Connect a test lamp between the recline motor forward control circuit and the recline motor rearward control circuit of the harness connector.
  3. Operate the seat recline switch in the FORWARD and REARWARD directions.

Does the test lamp illuminate in both directions?

Go to Step 17

Go to Step 9

7

  1. Disconnect the seat adjuster switch harness connector.
  2. Connect a 3 amp fused jumper wire from the power seat recline forward switch signal circuit of the harness connector to a good ground.
  3. With a scan tool, observe the Seat Switches parameter.

Does the Seat Switches parameter change state?

Go to Step 16

Go to Step 11

8

  1. Disconnect the seat adjuster switch harness connector.
  2. Connect a 3 amp fused jumper wire from the power seat recline rearward switch signal circuit of the harness connector to a good ground.
  3. With a scan tool, observe the Seat Switches parameter.

Does the Seat Switches parameter change state?

Go to Step 16

Go to Step 12

9

Test the driver seat recline motor forward control circuit between the memory seat module and the recline motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 10

10

Test the driver seat recline motor rearward control circuit between the memory seat module and the recline motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 15

11

Test the power seat recline forward switch signal circuit between the power seat switch and the memory seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 15

12

Test the power seat recline rearward switch signal circuit between the power seat switch and the memory seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 15

13

Test the memory seat low reference circuit between the memory seat module and the recline position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 14

14

Test the 5 volt reference circuit between the memory seat module and the recline position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 15

15

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

Did you find and correct the condition?

Go to Step 21

Go to Step 18

16

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

Did you find and correct the condition?

Go to Step 21

Go to Step 19

17

Inspect for poor connections at the harness connector of the seat recline motor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 20

18

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

Did you complete the replacement?

Go to Step 21

--

19

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

Did you complete the replacement?

Go to Step 21

--

20

Replace the seat recline motor. Refer to Front Seat Adjuster Replacement .

Did you complete the replacement?

Go to Step 21

--

21

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2