Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: This table diagnoses inoperative lumbar support, does not move up or down (AM3), in the driver's seat. | ||||
1 | Did you perform the entire Lumbar Support: Memory System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the seat switch input was received? | -- | Go to Step 3 | Go to Step 9 |
3 |
Does the scan tool indicate that the seat switch output was received? | -- | Go to Step 4 | Go to Step 8 |
4 |
Does the motor run? | -- | Go to Step 5 | Go to Step 7 |
5 | Test for an open or short to ground in CKT 768 (TAN) between the lumbar massage module and the driver lumbar vertical motor and between the MSM and the lumbar massage module. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems. Is the wiring OK? | -- | Go to Step 6 | Go to Step 21 |
6 | Test for an open or short to ground in CKT 767 (PPL) between the lumbar massage module and the driver lumbar vertical motor and between the MSM and the lumbar massage module. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems. Is the wiring OK? | -- | Go to Step 16 | Go to Step 21 |
7 | Replace the driver lumbar vertical motor. Refer to Front Seat Lumbar Support Replacement . Is the repair complete? | -- | Go to Step 22 | -- |
8 | Test for proper terminal contact at the MSM connectors. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Is terminal contact OK? | -- | Go to Step 20 | Go to Step 18 |
9 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 10 | Go to Step 19 |
10 | Test for an open in CKT 1067 (YEL/BLK) between the lumbar massage module and the lumbar switch. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 11 | Go to Step 21 |
11 | Test for an open in CKT 1067 (YEL/BLK) between the lumbar massage module and the MSM. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 12 | Go to Step 21 |
12 | Test for an open in CKT 1066 (WHT) between the lumbar massage module and the lumbar switch. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 13 | Go to Step 21 |
13 | Test for an open in CKT 1066 (WHT) between the lumbar massage module and the MSM. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 14 | Go to Step 21 |
14 | Test for an open in CKT 3740 (ORN) between the lumbar massage module cavity A and splice S312 (LH drive) or splice S314 (RH drive). Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 15 | Go to Step 21 |
15 | Test for an open in CKT 550 (BLK) (LH drive) or CKT 650 (BLK) (RH drive) between the lumbar massage module cavity J and splice S313 (LH drive) or splice S315 (RH drive). Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 16 | Go to Step 21 |
16 | Test for proper terminal contact at the lumbar massage module connector. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Is the terminal contact OK? | -- | Go to Step 17 | Go to Step 18 |
17 | Replace the lumbar massage module. Refer to Front Seat Lumbar Support Replacement . Is the repair complete? | -- | Go to Step 22 | -- |
18 | Repair the appropriate terminals. Refer to Connector Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 22 | -- |
19 | Replace the lumbar switch. Refer to Lumbar Switch Replacement . Is the repair complete? | -- | Go to Step 22 | -- |
20 | Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement in Seats. Is the repair complete? | -- | Go to Step 22 | -- |
21 | Repair the appropriate circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 22 | -- |
22 | Perform the Lumbar Support System Check . Is the system check complete? | -- | System OK | -- |
