Circuit Description
This trouble code (both current and history) indicates that CKT 356 is shorted to ground.
Conditions for Setting the DTC
All of the following conditions must be met:
| • | CKT 356 is shorted to ground. |
| • | The system voltage is between 9-16 volts. |
| • | The above conditions must be met for 0.25 seconds. |
Action Taken When the DTC Sets
Stores DTC B3127 in the body control module (BCM).
Conditions for Clearing the DTC
| • | The BCM goes to sleep and reinitializes with the fault cleared. |
| • | All of the BCM history codes clear after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles. |
| • | Use the Scan Tool in order to clear DTCs. |
Diagnostic Aids
If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This will cause the malfunction to appear.
Test Description
The numbers below refer to the numbers on the diagnostic table.
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This step determines a short to battery in CKT 356 within the left IP wiring harness junction block.
-
This step determines a short to battery in CKT 356 between the left /P wiring harness junction block and the Body Control Module (BCM).
Step | Action | Value(s) | Yes | No | ||
|---|---|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||||
1 | Was the Body Control Module (BCM) System Check performed? | -- | Go to Step 2 | |||
2 | Was the Power Door Locks System Check performed? | -- | Go to Step 3 | Go to Power Door Locks System Check in Doors | ||
3 | Does the driver's door lock actuator operate properly? | -- | Go to Step 11 | Go to Step 4 | ||
Replace the driver's door unlock relay with a known good relay from the left IP wiring harness junction block. Does the driver's door lock actuator operate properly? | -- | Go to Step 5 | Go to Step 6 | |||
5 | Replace the driver's door unlock relay. Is the repair complete? | -- | Go to Step 11 | -- | ||
Does the test lamp light? | -- | Go to Step 7 | Go to Step 8 | |||
7 | Replace the left IP wiring harness junction block. Is the repair complete? | -- | Go to Step 11 | -- | ||
Is the measured resistance equal to the specified value? | ∞ | Go to Step 10 | Go to Step 9 | |||
9 | Repair the short to ground in CKT 356. Is the repair complete? | -- | Go to Step 11 | -- | ||
10 | Replace the BCM. Refer to the following procedures:
Is the repair complete? | -- | -- | |||
11 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | -- | |||
