Power Seat Inoperative in One Direction. Buick Riviera 1998

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat Inoperative in One Direction

Step

Action

Value(s)

Yes

Was the entire Memory Seats System Check performed?

Go to Step 2

Go to Memory Seats System Check

Turn the ignition switch to the OFF position.
Connect a fused jumper from the memory seat/mirror diagnostic connector to ground (the connector may be taped up into the body harness).
Listen for a chime that acknowledges entrance into mode 1 diagnostics.

Does the memory seat/mirror module chime once and enter diagnostic mode?

Go to Step 4

Go to Step 3

Inspect CKT 571 (YEL/BLK) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 571 OK?

Go to Step 4

Go to Step 13

Refer to Memory Seats System Check for a detailed explanation of the memory seat/mirror diagnostic modes.
Operate the left seat switch in all directions.

The module will chime once for each switch input that the module receives.

Any time a switch is operated and the module does not chime, the module did not receive an input from that switch.

Were there any switch operations where the memory seat/mirror module did not sound a chime?

Go to Step 5

Go to Step 7

Disconnect the ground from the memory seat/mirror diagnostic connector.

After 5 seconds, the module will sound 3 chimes in order to indicate that the module has left the diagnostic mode.

Disconnect the left seat switch.
With the appropriate switch pressed, connect a J 39200 digital multimeter (DMM) from the suspect connector cavity in the list below to cavity B (Oldsmobile) or cavity A (Buick) of the left seat switch:

•	Entire Seat Forward: L (Oldsmobile) or G (Buick) (TAN)

•	Entire Seat Back: M (Oldsmobile) or H (Buick) (LT GRN)

•	Rear Vertical Up: N (Oldsmobile) or C (Buick) (YEL)

•	Rear Vertical Down: P (Oldsmobile) or F (Buick) (LT BLU)

•	Front Vertical Down: R (Oldsmobile) or B (Buick) (DK GRN)

•	Front Vertical Down: S (Oldsmobile) or D (Buick) (DK BLU)

•	Recline Forward: F (Oldsmobile) or K (Buick) (LT GRN)

•	Recline Back: E (Oldsmobile) or L (Buick) (LT BLU)

Is the resistance less than the specified value?

5 ohms

Go to Step 6

Go to Step 9

Inspect the following circuits for an open between the left seat switch and the memory seat/mirror module:

•	Entire Seat Forward: CKT 1522 (TAN)

•	Entire Seat Back: CKT 1532 (LT GRN)

•	Rear Vertical Up: CKT 1519 (YEL)

•	Rear Vertical Down: CKT 1521 (LT BLU)

•	Front Vertical Up: CKT 1518 (DK GRN)

•	Front Vertical Down: CKT 1520 (DK BLU)

•	Recline Up: CKT 276 (LT GRN)

•	Recline Down: CKT 277 (LT BLU). Refer to Testing for Continuity in Wiring Systems.

Is the suspect circuit OK?

Go to Step 7

Go to Step 13

Connect a test lamp from the appropriate motor connector cavity A to cavity B, while operating the corresponding seat switch.

Did the test lamp light?

Go to Step 8

Go to Step 14

Replace the suspect motor. Refer to Front Seat Recliner Actuator Motor Replacement or Front Seat Adjuster Motor Replacement .

Is the repair complete?

Go to Memory Seats System Check

Is the vehicle an Oldsmobile?

Go to Step 10

Go to Step 12

Is the inoperative function the recline function?

Go to Step 11

Go to Step 12

Inspect CKT 40 (ORN) for an open between S211 and the left seat switch cavity A. Refer to Testing for Continuity in Wiring Systems.

Is CKT 40 OK?

Go to Step 12

Go to Step 13

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

Is the repair complete?

Go to Memory Seats System Check

Repair the faulty circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Memory Seats System Check

Replace the memory seat/mirror module. Refer to Memory Seat Control Module Replacement .

Is the repair complete?

Go to Memory Seats System Check