B1482
DTC B1482
CIRCUIT DESCRIPTION
The body control module (BCM) uses the courtesy lamps supply voltage circuit as a input circuit and a output circuit. When used as an output circuit the BCM provides battery power to the courtesy lamps. When used as a input circuit the BCM provides an interface to the electrical loads which are controlled by the BCM when the output is inactive. This will allow for determination of the ON/OFF status of the loads.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1482 Battery Rundown Protection Circuit Low
CONDITIONS FOR RUNNING THE DTC
If the voltage level at the BCM drops to 0.
CONDITIONS FOR SETTING THE DTC
- The fault code sets when the BCM commanded state does not match the feedback. When the courtesy lamps supply voltage circuit is commanded high and a short to ground is present.
- The fault code also sets when the battery positive voltage circuit of the BCM that is fed by the Accy Pwr Bus fuse is open or shorted to ground.
- The condition above must be present for more than 0.1 seconds.
ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B1482 in memory.
CONDITIONS FOR CLEARING THE MIL/DTC
- A current DTC B1482 will clear if voltage is present on the battery positive voltage circuit and the BCM does not detect a short to ground.
- A history DTC B1482 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present nor any other malfunction in the BCM is detected.
- The BCM receives a clear code command from the scan tool.
DIAGNOSTIC AIDS
- If the DTC B1482 is a history DTC, the fault may be intermittent.
- The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground in the courtesy lamps supply voltage circuit .
- An intermittent open in the battery positive voltage circuit of the BCM that is fed by the Accy Pwr Bus fuse.
- The BCM is intermittently shorted to ground.
TEST
