Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: This table diagnoses inoperative lumbar support, does not move down (AM3), in the left 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) or (TAN/WHT) between the LH lumbar massage module and the LH lumbar vertical motor. 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 19 |
6 | Test for an open or short to ground in CKT 767 (PPL) or (PPL/WHT) between the LH lumbar massage module and the LH lumbar vertical motor. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems. Is the wiring OK? | -- | Go to Step 14 | Go to Step 19 |
7 | Replace the LH lumbar vertical motor. Is the lumbar vertical motor replacement complete? | -- | Go to Step 20 | -- |
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 18 | Go to Step 16 |
9 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 10 | Go to Step 17 |
10 | Test for an open in CKT 386 (YEL) between the LH lumbar massage module and the LH lumbar switch. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 11 | Go to Step 19 |
11 | Test for an open in CKT 386 (YEL) between the LH 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 19 |
12 | Test for an open in CKT 742 (RED) between the LH lumbar massage module cavity A and splice S352. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 13 | Go to Step 19 |
13 | Test for an open in CKT 850 (BLK) between the LH lumbar massage module cavity J and splice S351. Refer to Testing for Continuity in Wiring Systems. Is the wiring OK? | -- | Go to Step 14 | Go to Step 19 |
14 | Test for proper terminal contact at the LH lumbar massage module connector. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Is terminal contact OK? | -- | Go to Step 15 | Go to Step 16 |
15 | Replace the LH lumbar massage module. Is the lumbar massage module replacement complete? | -- | Go to Step 20 | -- |
16 | Repair the appropriate terminals. Refer to Connector Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
17 | Replace the LH lumbar switch. Refer to Lumbar/Heated Seat Switch Replacement - Power . Is the lumbar switch replacement complete? | -- | Go to Step 20 | -- |
18 | Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement . Is the memory seat module replacement complete? | -- | Go to Step 20 | -- |
19 | Repair the appropriate circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
20 | Perform the Lumbar Support System Check . Is the system check complete? | -- | System OK | -- |
