Symptom Troubleshooting

Possible cause	Diagnostic procedure	Notes
Faulty connector Faulty wire harness Faulty battery sensor	Inspect the connector to be sure it is making good contact. Check for an open or high resistance in the wire. Disconnect the battery sensor from the battery negative terminal and reconnect it. Check for DTCs. Replace the battery sensor.	The battery sensor is initialized and recalibrated automatically after reconnecting. To do this process quickly, turn off all electrical loads, lock all doors with the transmitter, and remove the No. 12 (7.5 A) fuse from the under-hood fuse/relay box. Then disconnect the battery sensor 2P connector, wait 5 seconds, reconnect it, and reinstall the fuse. The battery sensor is initialized and recalibrated within 10 minutes.
Faulty battery	Test the battery (see BATTERY TEST ).
Faulty alternator Low battery voltage Low battery charge	Troubleshoot the charging system (see CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING ). Check for excessive parasitic draw with the ignition switch in LOCK (0) and the key removed, or the vehicle ignition in the OFF mode.	This system may be caused by: Long-term parking Frequent short trips Using the vehicles electrical devices, like the audio system, for long periods with the engine off