GM Service Manual Online
For 1990-2009 cars only

Power Seat Does Not Recline w/o A45

Step

Action

Value(s)

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

2

  1. Probe the seat recline backward control circuit of the power seat switch with a test lamp that is connected to a good ground.
  2. Operate the seat recline BACKWARD switch.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 5

3

  1. Probe the seat recline forward control circuit of the power seat switch with a test lamp that is connected to a good ground.
  2. Operate the seat recline FORWARD switch.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 5

4

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

Does the test lamp illuminate in both directions?

--

Go to Step 6

Go to Step 7

5

Inspect for poor connections at the harness connector of the power seat 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 10

Go to Step 8

6

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 10

Go to Step 9

7

Repair the open in the seat recline forward/back control circuits of the recline motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 10

--

8

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

Did you complete the replacement?

--

Go to Step 10

--

9

Replace the seat recline motor. Refer to Front Seat Recliner Actuator Motor Replacement .

Did you complete the replacement?

--

Go to Step 10

--

10

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

Value(s)

Yes

No

SCHEMATIC REFERENCE: Memory Seats Schematics

1

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

--

Go to Step 2

Diagnostic System Check - Power Seat Systems

2

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

Does the Seat Recline Forward parameter change state?

--

Go to Step 3

Go to Step 5

3

  1. With a scan tool, observe the Seat Recline Backward parameter.
  2. Operate the seat recline switch in the BACKWARD direction.

Does the Seat Recline Backward parameter change state?

--

Go to Step 4

Go to Step 6

4

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

Does the test lamp illuminate in both directions?

--

Go to Step 13

Go to Step 7

5

  1. Disconnect the power seat switch harness connector.
  2. Connect a 3 amp fused jumper wire from battery positive voltage (B+) to the seat recline forward input circuit of the switch connector.
  3. With a scan tool, observe the Seat Recline Forward parameter.

Does the Seat Recline Forward parameter change state?

--

Go to Step 12

Go to Step 9

6

  1. Disconnect the power seat switch harness connector.
  2. Connect a 3 amp fused jumper wire from battery positive voltage (B+) to the seat recline backward input circuit of the switch connector.
  3. With a scan tool, observe the Seat Recline Backward parameter.

Does the Seat Recline Backward parameter change state?

--

Go to Step 12

Go to Step 10

7

Test the seat recline forward motor 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 17

Go to Step 8

8

Test the seat recline backward motor 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 17

Go to Step 11

9

Test the seat recline forward input 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 17

Go to Step 11

10

Test the seat recline backward input 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 17

Go to Step 11

11

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 17

Go to Step 14

12

Inspect for poor connections at the harness connector of the power seat 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 17

Go to Step 15

13

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 17

Go to Step 16

14

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

Did you complete the replacement?

--

Go to Step 17

--

15

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

Did you complete the replacement?

--

Go to Step 17

--

16

Replace the seat recline motor. Refer to Front Seat Recliner Actuator Motor Replacement .

Did you complete the replacement?

--

Go to Step 17

--

17

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2