Power Seat Inoperative. Buick Riviera 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat Inoperative

Power Seat Inoperative w/o A45

Step	Action	Value(s)	Yes	No
1	Was the entire Power Seats System Check performed?	--	Go to Step 2	Go to Power Seats System Check
2	Inspect CKT 1340 (ORN) for an open. Refer to Testing for Continuity in Wiring Systems. Is CKT 1340 OK?	--	Go to Step 3	Go to Step 5
3	Inspect CKT 150 (BLK) for an open. Refer to Testing for Continuity in Wiring Systems. Is CKT 150 OK?	--	Go to Step 4	Go to Step 5
4	Replace the suspect seat switch. Refer to Power Seat Switch Replacement . Is the seat switch replacement complete?	--	Go to Power Seats System Check	--
5	Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Power Seats System Check	--

Power Seat Inoperative A45

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 (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 Seat Circuit Description for a detailed explanation of the memory seat/mirror diagnostic modes.
Operate the LH 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 sounded a chime?

Go to Step 5

Go to Step 6

Diagnose each suspect switch separately.

Refer to Power Seat Inoperative in One Direction .

Is the repair complete?

Go to Memory Seats System Check

Disconnect the LH seat switch connector.

For Buick vehicles, the LH seat switch connector is C306.

On Buick vehicles, connect a DMM from connector C306 cavity A (ORN) to ground.
On Oldsmobile vehicles, connect a DMM from LH seat switch connector cavity B (ORN) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 7

Go to Step 11

•	On Buick vehicles, connect a DMM from the LH seat switch connector C306, cavity A (ORN) to cavity E (BLK).

•	On Oldsmobile vehicles, connect a DMM from the LH seat switch connector cavity B (ORN) to cavity D (BLK).

Is the voltage within the specified range?

10-15 V

Go to Step 8

Go to Step 12

•	On Buick vehicles, briefly connect a fused jumper from the LH seat switch connector C603, cavity A (ORN) to cavity G (TAN).

•	On Oldsmobile vehicles, briefly connect a fused jumper from the LH seat switch connector cavity B (ORN) to cavity L (TAN).

Does the LH seat move forward while the fused jumper was connected?

Go to Step 10

Go to Step 9

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

Is the memory seat/mirror module replacement complete?

Go to Memory Seats System Check

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

Is the seat switch replacement complete?

Go to Memory Seats System Check

•	On Buick vehicles, repair the open in CKT 1340 (ORN) between S339 and the LH seat switch.

•	On Oldsmobile vehicles, repair the open in CKT 40 (ORN) between S211 and the LH seat switch.

Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Memory Seats System Check

Repair the open in CKT 150 (BLK) between S290 and the LH seat switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Memory Seats System Check

Repair the open in CKT 571 (YEL/BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Memory Seats System Check