DEFINITION: Upward or downward controls are inoperative for the front vertical motor. Horizontal and rear tilt motors operate normally. Either driver or passenger seat.

Did you review the Power Seat Systems Operation and Circuit Description, and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

1. Disconnect the LH or RH seat adjuster switch connector.
2. Connect a jumper wire from:

•	LEFT SIDE = The seat adjuster switch connector terminal 26 to ground.

•	RIGHT SIDE = The seat adjuster switch connector terminal 1 to ground.

Does the seat motor move?

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Go to Step 3

Go to Step 5

Connect the jumper wire from:

Does the seat motor move?

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Go to Step 4

Go to Step 7

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

Is the repair complete?

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Go to Step 16

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1. Disconnect the RH or LH seat relay center connector C1.
2. Connect a DMM between the seat relay center connector C1 terminal 16 and the seat adjuster switch connector:

•	LEFT SIDE = Terminal 26.

•	RIGHT SIDE = Terminal 1.

3. Test CKT 1518 for continuity.

Is CKT 1518 continuous between these two connectors?

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Go to Step 9

Go to Step 6

Inspect and repair an open or a high resistance in CKT 1518.

Is the repair complete?

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Go to Step 16

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1. Disconnect the RH or LH seat relay center connector C1.
2. Connect a DMM between the seat relay center connector C1 terminal 17 and the seat adjuster switch connector:

•	LEFT SIDE = Terminal 1.

•	RIGHT SIDE = Terminal 26.

3. Test CKT 1520 for continuity.

Is CKT 1520 continuous between these two connectors?

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Go to Step 9

Go to Step 8

Inspect and repair an open or a high resistance in CKT 1520.

Is the repair complete?

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Go to Step 16

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1. Disconnect the RH or LH seat relay center connector C2 and C3.
2. Using two jumper wires, perform the following test:

•	Connect a jumper wire between battery power and the seat relay center connector C3 terminal C.

•	Connect a second jumper wire between ground and the seat relay center connector C2 terminal E.

3. Now reverse the jumper wires as follows:

•	Connect the jumper wire between battery power and the seat relay center connector C2 terminal E.

•	Connect the second jumper wire between ground and the seat relay center connector C3 terminal C.

Does the front vertical motor operate in both directions?

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Go to Step 11

Go to Step 10

1. Disconnect the RH or LH lower seat motor connector C1.
2. Connect a DMM between the seat relay center connector C3 terminal C and the seat motor connector C1 terminal D.
3. Test CKT 287 for continuity.

Is CKT 287 continuous between these two connectors?

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Go to Step 12

Go to Step 13

Replace the RH or LH seat relay center.

Is the repair complete?

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Go to Step 16

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Inspect and repair an open or a high resistance in CKT 287.

Is the repair complete?

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Go to Step 16

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1. Connect a DMM between the seat relay center connector C2 terminal E and the seat motor connector C1 terminal C.
2. Test CKT 286 for continuity.

Is CKT 286 continuous between these two connectors?

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Go to Step 14

Go to Step 15

Inspect and repair an open or a high resistance in CKT 286.

Is the repair complete?

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Go to Step 16

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Inspect the front vertical seat motor and linkage for any binding. If OK, replace the RH or LH front vertical seat motor. Refer to Front Seat Adjuster Motor Replacement .

Is the repair complete?

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Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2