Step
| Action
| Value(s)
| Yes
| No
|
Important:
| • | Inspect the condition of the body control module (BCM), Ign 1,
the cruise and the park lamp fuses (located in the left bussed electrical
center (LBEC) and the mid bussed electrical center MBEC). If any fuse
is open, replace the fuse and retest system for intermittent fuse failure.
If the fuse continues to fail locate and repair source of overload. Refer
to Power Distribution Schematics. |
| • | Inspect to make sure that Ground G203 and G304 are clean and tight. |
| • | This diagnostic table assumes that all other chimes function properly. |
|
1
|
- Turn ON the ignition.
- Using a scan tool, read the BCM input data for key in ignition.
Does the scan tool read the specific value?
| YES
|
Go to Step
2
|
Go to Step
4
|
2
|
- Open the driver door.
- Using a scan tool, read the BCM input data for the driver door
jamb switch.
Does the scan tool read the specific value?
| ACTIVE
|
Go to Step 3
|
Go to Step
9
|
3
| Replace the BCM. Refer to
Body Control Module Replacement
in Body Control Systems.
Is the repair complete?
| --
| System OK
| --
|
4
|
- Turn OFF the ignition.
- Leave the drivers door open.
- Disconnect the in-line connector C201B at the steering column.
- Connect a fused jumper between CKT 80 (LT GRN) cavity B3 and CKT
1850 (BLK) cavity B4.
Does the key in ignition data read the specific value?
| YES
|
Go to Step 5
|
Go to Step 6
|
5
| Replace
the key in the ignition switch.
Is the repair complete?
| --
| System OK
| --
|
6
| Connect a self powered test lamp between CKT 1850 (BLK)
cavity B4 and ground.
Does the test lamp light?
| --
|
Go to Step
8
|
Go to Step
7
|
7
| Locate and repair the open in CKT
1850 (BLK) between C201B and ground.
Is the repair complete?
| --
| System OK
| --
|
8
| Locate and repair the open in CKT 80 (LT GRN) between C201B
and the BCM.
Is the repair complete?
| --
| System OK
| --
|
9
|
- Turn OFF the ignition.
- Remove the connector combs from the BCM connector C3, leaving
the BCM connected.
- Using the appropriate probe from the J 35616
connector test adapter kit, backprobe CKT 126 (TAN) cavity
B4 to ground with a fused jumper.
- Turn ONthe ignition.
Does the driver door jamb switch read the specified data?
| --
|
Go to Step 11
|
Go to Step 10
|
10
| Replace
the BCM.
Is the repair complete?
| --
| System OK
| --
|
11
|
- Disconnect drivers door jamb switch connector.
- Connect a fused jumper between the drivers door jamb switch CKT
126 (TAN) cavity A (base truck) or cavity C (up level truck) and CKT 1850
(BLK) cavity D.
Does the driver door jamb switch read specific data?
| --
|
Go to Step 12
|
Go to Step 13
|
12
| Replace
the drivers door jamb switch.
Is the repair complete?
| --
| System OK
| --
|
13
| Connect a self powered test lamp between CKT 1850 (BLK)
cavity D and ground.
Does the test lamp light?
| --
|
Go to Step
14
|
Go to Step
15
|
14
| Locate and repair the open in CKT
126 (TAN) between the drivers door jamb switch and the BCM.
Is the repair complete?
| --
| System OK
| --
|
15
| Locate and repair the open in CKT 1850 (BLK) between the
drivers door jamb switch and ground.
Is the repair complete?
| --
| System OK
| --
|
16
| Locate and repair as needed.
Is the repair complete?
| --
| System OK
| --
|
