Circuit Description
This is the hardware Ignition 0, CKT 1600 input to the body control module (BCM) or the instrument cluster. The input can be either in the ON or OFF position from the ignition switch.
Conditions for Setting the DTC
All of the following conditions must be met:
| • | Ignition 0 is not active |
| • | Ignition 1 is active for 20 seconds |
Action Taken When the DTC Sets
DTC B1369 is stored in the BCM memory.
Conditions for Clearing the DTC
| • | The BCM goes to sleep. The controller reinitializes with the fault cleared. |
| • | All BCM history codes will be cleared after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles. |
| • | Use the Scan Tool . |
Diagnostic Aids
| • | If the fuel guage is always reading empty, the problem lies within the body control module (BCM) or the wiring to the BCM. |
| • | The instrument cluster will not function if ignition 0 is not present in the vehicle. |
| • | If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and connectors. This can often cause the malfunction to appear. |
Test Description
The numbers listed below refer to the numbers on the diagnostic table.
-
This step determines if CKT 1600 is shorted to ground.
-
This step determines if the body control module (BCM) is internally shorted.
-
This step determines if the instrument cluster is internally shorted.
-
This step determines if voltage is supplied from the battery to the fuse.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the BCM System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool display ACTIVE? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 | Inspect the IPC/BFC ACC fuse. Is the fuse open? | -- | Go to Step 4 | Go to Step 7 |
4 |
Does the test lamp illuminate? | -- | Go to Step 5 | Go to Diagnostic Aids |
5 |
Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 11 |
6 |
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 12 |
7 |
Does the test lamp illuminate for one of the circuits? | -- | Go to Step 8 | Go to Step 10 |
8 | Test the ignition 0 positive voltage circuit for an open. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 |
9 | Repair the short to ground in the ignition 0 positive voltage circuit. Did you complete the action? | -- | Go to Step 15 | -- |
10 | Repair the open in the ignition feed circuit to the IPC/BFC ACC fuse. Did you complete the action? | -- | Go to Step 15 | -- |
11 | Inspect for poor connections at the harness connector of the BCM. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 |
12 | Inspect for poor connections at the harness connector of the IPC. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14 |
13 | Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems. Is the repair complete? | -- | Go to Step 15 | -- |
14 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 15 | -- |
15 | Use the Scan Tool in order to clear the DTCs. Is the action complete? | -- | -- |
