Step
| Action
| Value(s)
| Yes
| No
|
IMPORTANT:
This table assumes that the mechanical systems are clear and free of obstructions.
|
1
| Are both the lumbar and bolster inoperative?
| --
| Go to
Step 2
| Go to
Step 4
|
2
|
- Disconnect the inoperative lumbar/bolster switch connector.
- Connect a test lamp between CKT 1440 (ORN) cavity A and ground.
Does the test lamp light?
| --
| Go to
Step 3
| Go to
Step 6
|
3
| Connect a test lamp between CKT 2350 (BLK) cavity C and battery positive
voltage.
Does the test lamp light?
| --
| Go to
Step 4
| Go to
Step 7
|
4
|
- Ensure the inoperative lumbar/bolster switch is connected to the
harness.
- Backprobe a fuse jumper between the respective lumbar/bolster
switch terminals and ground.
- Backprobe a fused jumper between CKT 1440 (ORN) cavity A and respective
lumbar/bolster switch terminals.
- Reverse jumper position on switch terminals.
- Observe motor operation.
Does the lumbar/bolster motor operate in both directions?
| --
| Go to
Step 5
| Go to
Step 8
|
5
| Replace the inoperative lumbar/bolster switch. Refer to
Lumbar Switch Replacement
.
Is the repair complete?
| --
| Go to
Lumbar Support System Check
| --
|
6
|
- Locate and repair open in CKT 1440 (ORN) between the inoperative
seat switch and the seat circuit breaker (located in the left bussed electrical
center LBEC).
- If no open is found, test the seat circuit breaker for proper
operation refer to
Circuit Protection - Circuit Breakers
and
Testing for Short to Ground
in wiring systems.
Is the repair complete?
| --
| Go to
Lumbar Support System Check
| --
|
7
| Locate and repair open in CKT 2350 (BLK) between the seat switch and
ground.
Is the repair complete?
| --
| Go to
Lumbar Support System Check
| --
|
8
| Replace the inoperative lumbar/bolster motor and wiring harness. Refer
to
Front Seat Lumbar Support Replacement
.
Is the repair complete?
| --
| Go to
Lumbar Support System Check
| --
|
