Lumbar Support Inoperative. Cadillac Seville

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1998 🢒 Seville - RHD 🢒 Body and Accessories 🢒 Seats 🢒 Lumbar Support Inoperative

Lumbar Support Inoperative A45 with AC9

Step

Action

Value(s)

Yes

Was the entire Lumbar Support System Check performed?

Go to Step 2

Go to Lumbar Support System Check

Does the other adaptive seat operate properly?

Go to Step 10

Go to Step 3

Check the rear junction block MEM T&T Fuse for an open.

Is MEM T&T Fuse OK?

Go to Step 4

Go to Step 6

Check the rear junction block IGN 3 RR Fuse for an open.

Is IGN 3 RR Fuse OK?

Go to Step 5

Go to Step 8

Replace the rear junction block. Refer to Rear Junction Block Replacement.

Is the rear junction block replacement complete?

Go to Lumbar Support System Check

Repair the short to ground in CKT 2840 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Step 7

Replace MEM T&T Fuse in the rear junction block. Refer to Wiring Repairs in Wiring Systems.

Is MEM T&T Fuse replacement complete?

Go to Lumbar Support System Check

Repair the short to ground in CKT 41 (BRN). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Step 9

Replace IGN 3 RR Fuse in the rear junction block. Refer to Wiring Repairs in Wiring Systems.

Is IGN 3 RR Fuse replacement complete?

Go to Lumbar Support System Check

Backprobe the adaptive lumbar module connector with a test lamp from cavity S (ORN) to ground.

Does the test lamp light?

Go to Step 11

Go to Step 22

Backprobe the adaptive lumbar module connector with a test lamp from cavity S (ORN) to cavity A (BLK).

Does the test lamp light?

Go to Step 12

Go to Step 23

Turn the ignition switch to ON position.
Backprobe the adaptive lumbar module connector with a test lamp from cavity M (BRN) to ground.

Does the test lamp light?

Go to Step 13

Go to Step 24

Backprobe the lumbar switch connector with a test lamp from cavity G (ORN) to ground.

Does the test lamp light?

Go to Step 14

Go to Step 25

Backprobe the adaptive lumbar module connector with a test lamp from cavity F (LT BLU/WHT) (LH) or (PNK) (RH) to ground.
Move the lumbar switch in the AUTO/ON position.

Does the test lamp light?

Go to Step 15

Go to Step 29

Backprobe the adaptive lumbar module connector with a test lamp from cavity E (PPL) (LH) or (WHT) (RH) to ground.
Move the lumbar switch in the OFF position.

Does the test lamp light?

Go to Step 16

Go to Step 33

Backprobe the adaptive lumbar module connector with a test lamp from cavity G (DK BLU) to ground.
Move the lumbar switch in the IN position.

Does the test lamp light?

Go to Step 17

Go to Step 37

Backprobe the adaptive lumbar module connector with a test lamp from cavity H (YEL) to ground.
Move the lumbar switch in the OUT position.

Does the test lamp light?

Go to Step 18

Go to Step 41

Disconnect the lumbar pump motor.
Connect a fused jumper from battery positive voltage (B+) to one lumbar pump motor terminal.
Connect a fused jumper from the other lumbar pump motor terminal to ground.

Does the motor run?

Go to Step 19

Go to Step 46

Turn the ignition switch to the OFF position.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar pump motor connector cavity A (BRN) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 20

Go to Step 47

Connect a DMM from the lumbar pump motor connector cavity B (GRY) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 21

Go to Step 48

Replace the adaptive lumbar module. Refer to Lumbar Component Replacement - Power .

Is the adaptive lumbar module replacement complete?

Go to Lumbar Support System Check

Repair the open in CKT 2840 (ORN) between S302 and the adaptive lumbar module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Perform the appropriate procedure:

•	LH: Repair the open in CKT 550 (BLK) between S313 and the LH adaptive lumbar module.

•	RH: Repair the open in CKT 650 (BLK) between S315 and the RH adaptive lumbar module.

Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 41 (BRN) between the rear junction block and the adaptive lumbar module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Disconnect the lumbar switch connector.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar switch connector cavity G (ORN) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 27

Go to Step 26

Connect a DMM from the lumbar switch connector cavity G (ORN) to the adaptive lumbar module connector cavity L (ORN).

Is the resistance less than the specified value?

5 ohms

Go to Step 45

Go to Step 28

Repair the short to ground in CKT 1740 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 1740 (ORN) between the adaptive lumbar module and the lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Disconnect the lumbar switch connector.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar switch connector cavity B (LT BLU/WHT) (LH) or cavity C (PNK) (RH) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 31

Go to Step 30

Connect a DMM from the lumbar switch connector cavity B (LT BLU/WHT) (LH) or cavity C (PNK) (RH) to the adaptive lumbar module connector cavity F.

Is the resistance less than the specified value?

5 ohms

Go to Step 45

Go to Step 32

Repair the short to ground in CKT 2292 LT BLU/WHT) (LH) or CKT 2290 (PNK) (RH). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 2293 (PPL) (LH) or CKT 2291 (WHT) (RH) between the adaptive lumbar module and the lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Disconnect the lumbar switch connector.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar switch connector cavity C (PPL) (LH) or cavity B (WHT) (RH) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 35

Go to Step 34

Connect a DMM from the lumbar switch connector cavity C (PPL) (LH) or cavity B (WHT) (RH) to the adaptive lumbar module connector cavity E.

Is the resistance less than the specified value?

5 ohms

Go to Step 45

Go to Step 36

Repair the short to ground in CKT 2293 (PPL) (LH) or CKT 2291 (WHT). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 2293 (PPL) (LH) or CKT 2291 (WHT) between the adaptive lumbar module and the lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Disconnect the lumbar switch connector.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar switch connector cavity A (DK BLU) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 39

Go to Step 38

Connect a DMM from the lumbar switch connector cavity A (DK BLU) to the adaptive lumbar module connector cavity G.

Is the resistance less than the specified value?

5 ohms

Go to Step 45

Go to Step 40

Repair the short to ground in CKT 1064 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 1064 (DK BLU) between the adaptive lumbar module and the lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Disconnect the lumbar switch connector.
Disconnect the adaptive lumbar module connector.
Connect a DMM from the lumbar switch connector cavity F (YEL) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 43

Go to Step 42

Connect a DMM from the lumbar switch connector cavity F (YEL) to the adaptive lumbar module connector cavity H.

Is the resistance less than the specified value?

5 ohms

Go to Step 45

Go to Step 44

Repair the short to ground in CKT 1065 (YEL) . Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 1065 (YEL) between the adaptive lumbar module and the lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Replace the lumbar switch. Refer to Lumbar Switch Replacement .

Is the lumbar switch replacement complete?

Go to Lumbar Support System Check

Replace the lumbar pump motor. Refer to Lumbar Component Replacement - Power .

Is the motor replacement complete?

Go to Lumbar Support System Check

Repair the open in CKT 9172 (BRN) between the adaptive lumbar module and the lumbar pump motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Repair the open in CKT 9173 (GRY) between the adaptive lumbar module and the lumbar pump motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Lumbar Support System Check

Lumbar Support Inoperative A45 with AL2

Step	Action	Value(s)	Yes	No
1	Was the entire Lumbar Support System Check performed?	--	Go to Step 2	Go to Lumbar Support System Check
2	Check the rear junction block MEM T&T Fuse for an open. Is MEM T&T Fuse OK?	--	Go to Step 5	Go to Step 3
3	Repair the short to ground in CKT 2840 (ORN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete?	--	Go to Step 4	--
4	Replace MEM T&T Fuse. Refer to Wiring Repairs in Wiring Systems. Is the fuse replacement complete?	--	Go to Lumbar Support System Check	--
5	Disconnect the RH lumbar switch connector. Connect a DMM from the RH lumbar switch cavity G (ORN) to ground. Is the voltage within the specified range?	10-15 V	Go to Step 6	Go to Step 9
6	Did the RH lumbar move when a memory recall function was performed?	--	Go to Step 7	Go to Step 8
7	Replace the RH lumbar switch. Refer to Lumbar Switch Replacement . Is the RH switch replacement complete?	--	Go to Lumbar Support System Check	--
8	Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement . Is the MSM replacement complete?	--	Go to Lumbar Support System Check	--
9	Repair the open in CKT 2840 (ORN) between S326 and the RH seat switch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete?	--	Go to Lumbar Support System Check	--