B1480

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematics:

CIRCUIT DESCRIPTION
The battery rundown protection function allows the Body Control Module (BCM) to disable the courtesy lamps, the cargo lamps and the underhood lamp 40 minutes after the ignition switch is turned OFF. The BCM monitors the output of the inadvertent power relay on CKT 1732.

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9.0 and 16.0 volts.

CONDITIONS FOR SETTING THE DTC
^ When the BCM commands the inadvertent power relay ON via CKT 1393 and CKT 1732 has an absence of voltage at the BCM, DTC B1480 will set.
^ The above conditions must be met for 0.5 seconds.

Action Taken When the DTC Sets
The following lamps will be disabled:
^ The dome
^ The glove box
^ The reading
^ The underhood
^ The vanity

CONDITIONS FOR CLEARING THE MIL/DTC
^ This DTC will clear 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.
^ Use a scan tool in order to clear the history DTC(s).

DIAGNOSTIC AIDS
^ Perform a visual inspection for loose or poor connections at all related components.
^ Check for an open in CKT 40 or an open CTSY LP fuse.
^ Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the inadvertent power relay operates. Command both the ON and OFF states. Repeat the commands as necessary
3. Tests for voltage at the coil side of the inadvertent power relay. The CTSY LP fuse supplies power to the coil side of the inadvertent power relay.
4. Verifies that the body control module is providing ground to the inadvertent power relay.
5. Tests if ground is constantly being applied to the inadvertent power relay.
6. Since this is a general circuit malfunction code, it is necessary to test for both a short to voltage as well as an open on this circuit.