Step
| Action
| Value(s)
| Yes
| No
|
1
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminal C and ground.
Does the test lamp light?
| --
| Go to
Step 2
| Go to
Step 10
|
2
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminal A and ground.
- Set and hold the driver seat lumbar adjuster switch to the UP
position.
Does the test lamp light?
| --
| Go to
Step 3
| Go to
Step 11
|
3
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminal F and ground.
- Set and hold the driver seat lumbar adjuster switch to the DOWN
position.
Does the test lamp light?
| --
| Go to
Step 4
| Go to
Step 14
|
4
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminal B and ground.
- Set and hold the driver seat lumbar adjuster switch to the UP
position.
Does the test lamp light?
| --
| Go to
Step 5
| Go to
Step 16
|
5
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminal E and ground.
- Set and hold the driver seat lumbar adjuster switch to the DOWN
position.
Does the test lamp light?
| --
| Go to
Step 6
| Go to
Step 16
|
6
|
- Connect a test lamp.
- Backprobe between the up/down lumbar adjuster relay connector
terminals C and D.
Does the test lamp light?
| --
| Go to
Step 7
| Go to
Step 17
|
7
| Inspect for a poor connection or open in CKTs 767 or 768.
Is there a poor connection or open in CKTs 767 or 768?
| --
| Go to
Step 8
| Go to
Step 9
|
8
|
- Repair the poor connection or open in CKTs 767 or 768.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 9
| System OK
|
9
|
- Replace the up/down lumbar adjuster relay. Refer to
Front Seat Lumbar Support Replacement
.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 10
| System OK
|
10
|
- Repair the poor connection or open in CKT 340 between S331
and the up/down lumbar adjuster relay connector terminal C.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 11
| System OK
|
11
| Inspect for a poor connection or open in CKT 387.
Is there a poor connection or open in CKT 387?
| --
| Go to
Step 12
| Go to
Step 13
|
12
|
- Repair the poor connection or open in CKT 387.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 13
| System OK
|
13
|
- Replace the driver seat lumbar adjuster switch. Refer to
Front Seat Lumbar Support Replacement
.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 14
| System OK
|
14
| Inspect for a poor connection or open in CKT 386.
Is there a poor connection or open in CKT 386?
| --
| Go to
Step 15
| Go to
Step 13
|
15
|
- Repair the poor connection or open in CKT 386.
- Inspect the system.
Is the symptom still present?
| --
| Go to
Step 16
| System OK
|
16
|
- Replace the up/down lumbar support motor. Refer to
Front Seat Lumbar Support Replacement
.
- Inspect the system.
Is the symptom still present?
| --
| --
| System OK
|
17
|
- Repair the poor connection or open in CKT 750 between S330
and the up/down lumbar adjuster relay.
- Inspect the system.
Is the symptom still present?
| --
| --
| System OK
|
