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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Corvette 🢒 Body and Accessories 🢒 Seats 🢒 Lumbar Support Inoperative

Lumbar Support Inoperative Driver

Lumbar Support Inoperative (Driver Seat)

Step

Action

Value(s)

Yes

No

DEFINITION: Driver side lumbar support is inoperative. Passenger side lumbar support operates normally.

1

Did you review the Power Lumbar Description and Operation, and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2
  1. Disconnect the LH seat adjuster switch connector.
  2. Connect a test light between the seat adjuster switch connector terminal 20 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 3

3

Repair the open or high resistance in circuit 1740 between the instrument panel electrical center and the LH seat adjuster switch connector.

Is the repair complete?

--

Go to Step 14

--

4
  1. Disconnect the LH seat lumbar pump connector.
  2. Connect a test light between the LH seat lumbar pump connector terminal K and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Repair the open or high resistance in circuit 1140 between the instrument panel electrical center and the LH seat lumbar pump connector.

Is the repair complete?

--

Go to Step 14

--

6
  1. Connect a DMM between the LH seat lumbar pump connector terminal A and ground.
  2. Test circuit 150 for continuity to ground.

Is circuit 150 continuous to ground?

--

Go to Step 8

Go to Step 7

7

Repair the open or high resistance in circuit 150.

Is the repair complete?

--

Go to Step 14

--

8
  1. Reconnect the LH seat adjuster switch connector.
  2. Using a test light test for voltage at the following lumbar pump connector control circuit terminals while the respective switches are pressed:
    3. • lower lumbar inflate-terminal H
    • upper lumbar inflate-terminal G
    • side bolster inflate-terminal F
    • side bolster deflate-terminal E
    • upper lumbar deflate-terminal D
    • lower lumbar deflate-terminal C

Does the test light illuminate at each of the control circuit terminals while its switch is pressed?

--

Go to Step 12

Go to Step 9

9
  1. Disconnect the LH seat adjuster switch connector.
  2. Using a DMM test continuity of the inoperative control circuit(s) from the seat switch connector to the lumbar pump connector.

Is continuity present?

--

Go to Step 11

Go to Step 10

10

Repair the open or high resistance in the inoperative lumbar pump control circuit(s).

Is the repair complete?

--

Go to Step 14

--

11

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

Is the repair complete?

--

Go to Step 14

Go to Step 12

12

Inspect and repair or replace the lumbar air bladders, air lines or any other components for leaks, restrictions, or damage that may cause the inoperative condition. Refer to Lumbar Bladder Replacement or Front Seat Back Cushion Side Bolster Bladder Replacement .

Did you find and correct the condition?

--

Go to Step 14

Go to Step 13

13

Replace the LH seat lumbar pump. Refer to Lumbar Pump Replacement .

Is the repair complete?

--

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2

Lumbar Support Inoperative Passenger

Lumbar Support Inoperative (Passenger Seat)

Step

Action

Value(s)

Yes

No

DEFINITION: Passenger side lumbar support is inoperative. Driver side lumbar support operates normally.

1

Did you review the Power Lumbar Description and Operation, and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2
  1. Disconnect the RH seat adjuster switch connector.
  2. Connect a test light between the seat adjuster switch connector terminal 20 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 3

3

Repair the open or high resistance in circuit 1140 between the instrument panel electrical center and the RH seat adjuster switch connector.

Is the repair complete?

--

Go to Step 14

--

4
  1. Disconnect the RH seat lumbar pump connector.
  2. Connect a test light between the RH seat lumbar pump connector terminal K and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Repair the open or high resistance in circuit 1140 between the instrument panel electrical center and the RH seat lumbar pump connector.

Is the repair complete?

--

Go to Step 14

--

6
  1. Connect a DMM between the RH seat lumbar pump connector terminal A and ground.
  2. Test circuit 150 for continuity to ground.

Is circuit 150 continuous to ground?

--

Go to Step 8

Go to Step 7

7

Repair the open or high resistance in circuit 150.

Is the repair complete?

--

Go to Step 14

--

8
  1. Reconnect the RH seat adjuster switch connector.
  2. Using a test light test for voltage at the following lumbar pump connector control circuit terminals while the respective switches are pressed:
    3. • lower lumbar inflate-terminal H
    • upper lumbar inflate-terminal G
    • side bolster inflate-terminal F
    • side bolster deflate-terminal E
    • upper lumbar deflate-terminal D
    • lower lumbar deflate-terminal C

Does the test light illuminate at each of the control circuit terminals while its switch is pressed?

--

Go to Step 12

Go to Step 9

9
  1. Disconnect the RH seat adjuster switch connector.
  2. Using a DMM test continuity of the inoperative control circuit(s) from the seat switch connector to the lumbar pump connector.

Is continuity present?

--

Go to Step 11

Go to Step 10

10

Repair the open or high resistance in the inoperative lumbar pump control circuit(s).

Is the repair complete?

--

Go to Step 14

--

11

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

Is the repair complete?

--

Go to Step 14

Go to Step 12

12

Inspect and repair or replace the lumbar air bladders, air lines or any other components for leaks, restrictions, or damage that may cause the inoperative condition. Refer to Lumbar Bladder Replacement or Front Seat Back Cushion Side Bolster Bladder Replacement .

Did you find and correct the condition?

--

Go to Step 14

Go to Step 13

13

Replace the RH seat lumbar pump. Refer to Lumbar Pump Replacement .

Is the repair complete?

--

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2

Lumbar Support Inoperative Both

Both Lumbar Supports Inoperative (Driver and Passenger Seat)

Step

Action

Value(s)

Yes

No

DEFINITION: Both the driver and passenger side lumbar supports are inoperative. Passenger side seat position motors will also be inoperative but the driver side seat position motors operate normally.

1

Did you review the Power Lumbar Description and Operation, and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Inspect the LUMBAR MiniFuse® #3 for an open.

Is the fuse open?

--

Go to Step 5

Go to Step 3

3

Using a test light, test for voltage at terminal B of the LUMBAR MiniFuse® #3.

Does the test light illuminate?

--

Go to Step 4

Go to Power Distribution Schematics

4

Inspect the connectors C2 and C3 at the instrument panel electrical center for looseness, corrosion, or damage.

Are these connectors in good operating condition?

--

Go to Lumbar Support Inoperative

Go to Step 6

5

Replace the LUMBAR MiniFuse® #3.

Does the LUMBAR MiniFuse® #3 immediately open when installed?

--

Go to Step 7

Go to Step 8

6

Repair the instrument panel electrical center connectors C2 and C3 as necessary.

Is the repair complete?

--

Go to Step 14

--

7

Inspect and repair the short to ground in circuit 1140.

Is the repair complete?

--

Go to Step 14

--

8
  1. Disconnect the RH seat lumbar pump connector.
  2. Press each of the Passenger seat lumbar switch buttons one at a time.

When any of the passenger seat lumbar switch buttons are pressed, does the LUMBAR MiniFuse® #3 open?

--

Go to Step 9

Go to Step 10

9

Repair the short to ground in the lumbar control circuit which caused the fuse to open.

Is the repair complete?

--

Go to Step 14

--

10
  1. Reconnect the RH seat lumbar pump connector.
  2. Press all of the RH lumbar buttons on the RH seat adjuster switch one at a time.

When any of the passenger seat lumbar switch buttons are pressed, does the LUMBAR MiniFuse® #3 open?

--

Go to Step 11

Go to Step 12

11

Replace the RH seat lumbar pump. Refer to Lumbar Pump Replacement .

Is the repair complete?

--

Go to Step 14

--

12

Press all of the LH lumbar buttons on the LH seat adjuster switch one at a time.

When any of the driver seat lumbar switch buttons are pressed, does the LUMBAR MiniFuse® #3 open?

--

Go to Step 13

Go to Testing for Intermittent Conditions and Poor Connections

13

Replace the LH seat lumbar pump. Refer to Lumbar Pump Replacement .

Is the repair complete?

--

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2