B1480

DTC B1480

CIRCUIT DESCRIPTION
The body control module (BCM) supplies battery positive voltage to the individually controlled lamps. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power supply voltage circuit to prevent a total battery discharge condition.

Voltage for the inadvertent power supply voltage circuit is from the TBC 2C fuse in the instrument panel (I/P) fuse block directly through the BCM to this circuit.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1480 Battery Rundown Protection Circuit

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
- The inadvertent power supply voltage circuit is shorted to ground for more than 1 second.
- There is a loss of the instrument panel fuse block TBC 2C battery supply voltage to the BCM for 1 second while one or more of the lamps in the inadvertent power circuit has been activated.

ACTION TAKEN WHEN THE DTC SETS
The lamps on the inadvertent power supply voltage circuit will not operate.

CONDITIONS FOR CLEARING THE MIL/DTC
- This DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- History and current DTCs can be cleared using a scan tool.

DIAGNOSTIC AIDS
- Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
- A short to ground in the inadvertent power supply voltage circuit or the battery positive voltage circuit will cause the TBC 2C fuse to open.

TEST DESCRIPTION

Step 1 - Step 6:

The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if the problem exists in the wiring or the BCM.
5. After replacement of the BCM you must calibrate the new module for proper operation.