12 Volt Battery Symptom Troubleshooting - Low or dead 12 volt battery

NOTE: 

• A 12 volt battery might be discharged under these conditions:
• • -

    Driving a vehicle 6 miles (10 km) or less per day.

  • -

    Leaving a vehicle idling with high electrical loads such as headlight, seat heaters, wipers, rear window defogger, etc.

• When doing the following operation during the measurement of the parasitic draw, it may not be measured accurate:
• • -

    Approaching a vehicle with remote.

  • -

    Locking or unlocking a door.

Indication Example 

1. BCM system check

   -1. Check for PGM-FI DTCs.

   DTC (Electric Powertrain)

   DTC Description	Confirmed DTC	Pending DTC
   P0A94 DC-DC Converter Performance

   Is DTC P0A94 indicated?

   YES 

   Go to indicated DTCs troubleshooting .

   NO 

   Go to step 2.

2. Parasitic draw check

   -1. Check all the BATTERY CONSUMPTION CURRENT HISTORY with the HDS.

   Battery Consumption Current History

   Threshold of the average current
   27.0 mA

   Are all the values of average current from 1 hour to 2 hours less than the threshold?

   YES 

   Check the 12 volt battery .

   NO 

   Go to step 3.

3. Problem verification

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Get out of the vehicle, and close all doors, hood, and tailgate securely.

   -3. Lock the doors with the keyless remote/transmitter.

   -4. Make sure the individual map lights are turned off and the security alarm system is armed (with security).

   -5. Wait 130 minutes or more.

   -6. Turn the vehicle to the ON mode.

   -7. Check the latest BATTERY CONSUMPTION CURRENT HISTORY with the HDS.

   Battery Consumption Current History

   Threshold of the average current
   27.0 mA

   Is the value of average current from 1 hour to 2 hours less than the threshold?

   1. YES 

      Intermittent failure, the system is OK at this time.The possible cause could be that an incorrect parasitic draw value was recorded:

      • A switch was not turned off.
      • The vehicle's accessories were operated for a long time with the vehicle ignition was in the ACCESSORY mode.

      NO 

      Go to the parasitic draw check .