Circuit Description
Battery rundown protection, inadvertent power, is controlled by the body control module (BCM). Should any device remain on, the BCM will turn inadvertent power off after 20 minutes to conserve battery energy. If a problem is detected on the inadvertent power supply circuit, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1482 Battery Rundown Protection Circuit Low
Conditions for Running the DTC
The interior lamps are active.
Conditions for Setting the DTC
Any of the following conditions will set this DTC:
| • | The inadvertent power supply circuit is open or shorted to ground. |
| • | The battery positive voltage circuit of the BCM is open or shorted to ground. |
Action Taken When the DTC Sets
Interior lamps are inoperative.
Conditions for Clearing the DTC
| • | The conditions for setting the DTC are no longer present. |
| • | A history DTC clears after 100 malfunction free ignition cycles. |
| • | The BCM receives the clear code command from the scan tool. |
Diagnostic Aids
If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Dimming Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Place the dome lamp in the on position. Does the dome lamp illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Test the battery positive voltage circuit of the body control module (BCM) for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 4 |
4 | Test the inadvertent power supply circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
6 | Replace the BCM. Refer to Control Module References in Computer/integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
