GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This table diagnoses the lumbar support, intermittent up down (option AM3) in the passenger seat.

1

Was the entire Lumbar Support System Check performed?

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Go to Step 2

Go to Lumbar Support System Check

2

  1. Disconnect the passenger lumbar vertical position sensor connector.
  2. Important:: When reconnecting the position sensor connector, be sure that the connector is connected in the proper direction. It is possible to reverse the connector and cause improper memory operation.

  3. Connect a DMM from the passenger lumbar vertical position sensor cavity B (GRY) to cavity C (BLK).

Is the resistance within the specified range?

9000 ohms - 11,000 ohms

Go to Step 3

Go to Step 9

3

Connect a DMM from the passenger lumbar vertical position sensor cavity A (DK BLU) to cavity C (BLK).

Is the resistance within the specified range?

500 ohms - 9500 ohms

Go to Step 4

Go to Step 9

4

  1. Disconnect the lumbar massage module connector.
  2. Connect a DMM from the passenger lumbar vertical position sensor connector cavity B (GRY) to the lumbar massage module connector cavity N (GRY).

Is the resistance less than the specified value?

5 ohms

Go to Step 5

Go to Step 10

5

Connect a DMM from the passenger lumbar vertical position sensor connector cavity C (BLK) to the lumbar massage module connector cavity L (BLK).

Is the resistance less than the specified value?

5 ohms

Go to Step 6

Go to Step 11

6

Connect a DMM from the passenger lumbar vertical position sensor connector cavity A (DK BLU) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 12

Go to Step 7

7

Connect a DMM from the passenger lumbar vertical position sensor connector cavity A (DK BLU) to the lumbar massage module connector cavity K (BLK).

Is the resistance less than the specified value?

5 ohms

Go to Step 8

Go to Step 13

8

Connect a DMM from the lumbar massage module connector cavity N (GRY) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 14

Go to Step 15

9

Replace the passenger lumbar vertical position sensor. Refer to Front Seat Lumbar Support Replacement .

Is the passenger lumbar vertical position sensor replacement complete?

--

Go to Step 16

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10

Repair the open in CKT 788 (GRY) between the passenger lumbar vertical position sensor and the lumbar massage module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 16

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11

Repair the open in CKT 782 (BLK) between the passenger lumbar vertical position sensor and the lumbar massage module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 16

--

12

Repair the short in CKT 1062 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 16

--

13

Repair the open in CKT 1062 (DK BLU) between the passenger lumbar vertical position sensor and the lumbar massage module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 16

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14

Repair the short in CKT 788 (GRY). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 16

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15

Replace the lumbar massage module. Refer to Front Seat Lumbar Support Replacement .

Is the lumbar massage module replacement complete?

--

Go to Step 16

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16

Perform the Lumbar Support System Check .

Is the system check complete?

--

Go to Diagnostic System Check - Power Seat Systems

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