GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the system operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms - Seats

2

Attempt to operate the lumbar support in both seats.

Does the lumbar support operate normally?

--

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

Go to Step 3

3

Connect a test lamp between the power seat cushion air control module connector C1 terminal A and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 5

4

Connect a test lamp between connector C1 terminal A and connector C2 terminal D at the power seat cushion air control module connector. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 8

5

Repair a poor connection or an open in the battery voltage circuit of the power seat cushion air control module. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 9

--

6

Inspect for and repair a poor connection at the power seat cushion air control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 9

Go to Step 7

7

Replace the power seat cushion air control module.

Did you complete the replacement?

--

Go to Step 9

--

8

Repair a poor connection or an open in the ground circuit of the power seat cushion air control module. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3