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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat - Head Restraint Does Not Move Up or Down

Power Seat - Head Restraint Does Not Move Up or Down without 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
  1. Backprobe the seat switch connector with a DMM from cavity K (WHT/BLK) (LH) or cavity N (LT GRN) (RH) to ground.
  2. Move the headrest switch UP.

Is the voltage within the specified range?

10-15 V

Go to Step 3

Go to Step 4

3
  1. Backprobe the seat switch connector with a DMM from cavity M (BLU/WHT) (LH) or cavity R (YEL) (RH) to ground.
  2. Move the headrest switch DOWN.

Is the voltage within the specified range?

10-15 V

Go to Step 5

Go to Step 4

4

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

Is the seat switch replacement complete?

--

Go to Power Seats System Check

--

5
  1. Backprobe the headrest motor connector with a DMM from cavity A (WHT/BLK) (LH) or cavity A (LT GRN) (RH) to ground.
  2. Move the headrest switch UP.

Is the voltage within the specified range?

10-15 V

Go to Step 6

Go to Step 8

6
  1. Backprobe the headrest motor connector with a DMM from cavity B (BLU/WHT) (LH) or cavity B (YEL) (RH) to ground.
  2. Move the headrest switch DOWN.

Is the voltage within the specified range?

10-15 V

Go to Step 7

Go to Step 9

7

Replace the headrest motor. Refer to Front Seat Back Frame Replacement .

Is the headrest motor replacement complete?

--

Go to Power Seats System Check

--

8

Repair the open in CKT 1257 (WHT/BLK) (LH) or CKT 1625 (LT GRN) (RH) between the seat switch and the headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Power Seats System Check

--

9

Repair the open in CKT 1258 (BLU/WHT) (LH) or CKT 1626 (YEL) (RH) between the seat switch and the headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Power Seats System Check

--

Power Seat - Head Restraint Does Not Move Up or Down A45 with AL2

Step

Action

Value(s)

Yes

No

1

Was the entire Memory Seats System Check performed?

--

Go to Step 2

Go to Memory Seats System Check

2
  1. Turn the ignition switch to the ON position.
  2. Connect a scan tool to the data link connector (DLC).
  3. Select INPUTS from the memory seat module (MSM) DATA DISPLAY.
  4. Operate the LH seat headrest switch in the UP direction.

Did the scan tool indicate that the seat switch input was received?

--

Go to Step 3

Go to Step 8

3

Operate the LH seat headrest switch in the DOWN direction.

Did the scan tool indicate that the seat switch input was received?

--

Go to Step 4

Go to Step 9

4
  1. Disconnect the LH headrest motor.
  2. Connect a fused jumper from battery positive voltage (B+) to one motor terminal.
  3. Connect a fused jumper from the other motor terminal to ground.

Did the motor run?

--

Go to Step 5

Go to Step 11

5

Check for an open or short to ground in CKT 1257 (YEL/BLK) between the MSM and the LH headrest motor.

Is CKT 1257 OK?

--

Go to Step 6

Go to Step 12

6

Check for an open or short to ground in CKT 1258 (PPL/BLK) between the MSM and the LH headrest motor.

Is CKT 1258 OK?

--

Go to Step 7

Go to Step 13

7

Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement .

Is the MSM replacement complete?

--

Go to Memory Seats System Check

--

8
  1. Disconnect the LH seat switch connector.
  2. Disconnect the memory seat module (MSM) connector C2.
  3. Connect a DMM from the LH seat switch connector cavity K (WHT/BLK) to the MSM connector C2 cavity D9 (WHT/BLK).

Is the resistance less than the specified value?

5 ohms

Go to Step 10

Go to Step 14

9
  1. Disconnect the LH seat switch connector.
  2. Disconnect the memory seat module (MSM) connector C2.
  3. Connect a DMM from the LH seat switch connector cavity M (DK BLU/WHT) to the MSM connector C2 cavity D10 (DK BLU/WHT).

Is the resistance less than the specified value?

5 ohms

Go to Step 10

Go to Step 15

10

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

Is the LH seat switch replacement complete?

--

Go to Memory Seats System Check

--

11

Replace the LH headrest motor. Refer to Front Seat Back Frame Replacement .

Is the motor replacement complete?

--

Go to Memory Seats System Check

--

12

Repair the open or short to ground in CKT 1257 (YEL/BLK) between the MSM and the LH headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

13

Repair the open or short to ground in CKT 1258 (PPL/BLK) between the MSM and the LH headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

14

Repair the open in CKT 1068 (WHT/BLK) between the LH seat switch and the MSM. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

15

Repair the open in CKT 1069 (DK BLU/WHT) between the LH seat switch and the MSM. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

Power Seat - Head Restraint Does Not Move Up or Down A45 with AC9

Step

Action

Value(s)

Yes

No

1

Was the entire Memory Seats System Check performed?

--

Go to Step 2

Go to Memory Seats System Check

2
  1. Turn the ignition switch to the ON position.
  2. Connect a scan tool to the data link connector (DLC).
  3. Select INPUTS from the memory seat module (MSM) DATA DISPLAY.
  4. Operate the LH seat headrest switch in the UP direction.

Did the scan tool indicate that the seat switch input was received?

--

Go to Step 3

Go to Step 8

3

Operate the LH seat headrest switch in the DOWN direction.

Did the scan tool indicate that the seat switch input was received?

--

Go to Step 4

Go to Step 9

4
  1. Disconnect the LH headrest motor.
  2. Connect a fused jumper from battery positive voltage (B+) to one motor terminal.
  3. Connect a fused jumper from the other motor terminal to ground.

Did the motor run?

--

Go to Step 5

Go to Step 11

5

Check for an open or short to ground in CKT 1257 (YEL/BLK) between the MSM and the LH headrest motor.

Is CKT 1257 OK?

--

Go to Step 6

Go to Step 12

6

Check for an open or short to ground in CKT 1258 (PPL/BLK) between the MSM and the LH headrest motor.

Is CKT 1258 OK?

--

Go to Step 7

Go to Step 13

7

Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement .

Is the MSM replacement complete?

--

Go to Memory Seats System Check

--

8
  1. Disconnect the LH seat switch connector.
  2. Disconnect the memory seat module (MSM) connector C2.
  3. Connect a DMM from the LH seat switch connector cavity K (WHT/BLK) to the MSM connector C2 cavity B9 (WHT/BLK).

Is the resistance less than the specified value?

5 ohms

Go to Step 10

Go to Step 14

9
  1. Disconnect the LH seat switch connector.
  2. Disconnect the memory seat module (MSM) connector C2.
  3. Connect a DMM from the LH seat switch connector cavity M (DK BLU/WHT) to the MSM connector C2 cavity B10 (DK BLU/WHT).

Is the resistance less than the specified value?

5 ohms

Go to Step 10

Go to Step 15

10

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

Is the LH seat switch replacement complete?

--

Go to Memory Seats System Check

--

11

Replace the LH headrest motor. Refer to Front Seat Back Frame Replacement .

Is the motor replacement complete?

--

Go to Memory Seats System Check

--

12

Repair the open or short to ground in CKT 1257 (YEL/BLK) between the MSM and the LH headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

13

Repair the open or short to ground in CKT 1258 (PPL/BLK) between the MSM and the LH headrest motor. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

14

Repair the open in CKT 1068 (WHT/BLK) between the LH seat switch and the MSM. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--

15

Repair the open in CKT 1069 (DK BLU/WHT) between the LH seat switch and the MSM. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Memory Seats System Check

--