B1480

Power Grounds Key-In Ignition Switch:

Serial Data, DRL:

DTC B1480 Battery Rundown Protection Circuit Malf (Part 1 Of 2):

DTC B1480 Battery Rundown Protection Circuit Malf (Part 2 Of 2):

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 SETTING THE DTC
^ When the BCM commands the inadvertent power relay on via CKT 1393 and CKT 1732 has an absence of voltage to the BCM, DTC B1480 will set.
^ The system voltage must be between 9.0-16.0 volts.
^ 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

CONDITIONS FOR CLEARING THE MIL/DTC
^ This DTC will clear 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

IMPORTANT: Use the appropriate probe from the connector test adapter kit J 35616-A for any probing of the Bussed Electrical Centers (BECs) in this table in order to avoid damage to the BECs.

^ Always diagnose the first DTC listed on the scan tool.
^ The scan tool must display DTC B1480 as a current code before performing diagnostics.
^ 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 Intermittents and Poor Connections in Diagrams.

TEST DESCRIPTION
Step number(s) below refer to the same step number(s) in the Diagnostic Table
2. This step tests the CTSY LP fuse.
6. This step inspects the control circuit of the inadvertent power relay, inadvertent power relay and the CTSY LP fuse.
7. This step determines if CKT 1732 is open or the BCM is unable to monitor voltage on circuit 1732.
8. This step determines if CKT 40 is open.
9. This step checks if CKT 1393 is open between the inadvertent power relay and the BCM.
10. This step determines if CKT 1732 is open between the mid Bussed Electrical Center (MBEC) and the BCM.