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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Starting System & Charging System (H4DO)) >> Battery >> Inspection >> Standby Current

Standby Current

WARNING: This page is about a different variant/trim than selected.
  1. Prepare the circuit tester which can measure down to 1 mA.
    NOTE: For model with keyless access function, the standby current changes regularly. Therefore, prepare the analog type circuit tester.
  2. Using the circuit tester, check the standby current.
  1. Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>Battery>INSPECTION>APPEARANCE . Ref. to STARTING/CHARGING SYSTEMS (H4DO)>Battery>INSPECTION>ELECTROLYTE LEVEL . Ref. to STARTING/CHARGING SYSTEMS (H4DO)>Battery>INSPECTION>SPECIFIC GRAVITY OF ELECTROLYTE . Ref. to STARTING/CHARGING SYSTEMS (H4DO)>Battery>INSPECTION>STANDBY CURRENT .
    NOTE: The standby current may be displayed lower than the actual value if the battery is weak, so be sure to check the battery. Charge or replace if necessary.
  2. Check that the fuse is not blown out and is properly inserted.
  3. When non-genuine electrical parts (including parts sold in authorized workshops) are installed, remove all parts except for genuine electrical parts.
  4. Check that back-up fuse is inserted. Ref. to PRE-DELIVERY INSPECTION>PRE-DELIVERY INSPECTION (PDI) PROCEDURE>FUSE INSTALLATION .
  5. Start the engine, and set the switch positions for each system as shown in the following table.
    NOTE: Some of the listed systems are not equipped depending on the vehicle. Set only the systems equipped on the vehicle to the positions as shown.
    [System] Position
    Headlight ON or Auto
    Fog light [ON]
    Wiper (front and rear) ON or Low speed
    Audio and navigation system [ON]
    Rear defogger [ON]
    Room light DOOR
    Luggage light DOOR
    Map light [OFF]
    Auto A/C ON (AUTO)
    Manual A/C ON (Speed 1)
    Electronic parking brake [ON]
    Electrical parts other than listed above (electrical parts that users can confirm the operation with the key removed) [OFF]
  6. Turn the ignition switch to OFF.
  7. Operate the front hood lock release lever to unlock the front hood.
  8. Close all the doors (including rear gate and trunk lid) and then lock the doors. (Security alarm is in set condition)
    NOTE: For model with keyless access function, take the access key 1.5 m or more away from the vehicle after the door lock. And do not put the access key close to the vehicle while measuring the standby current.
  9. Wait for 5 minutes after door lock until the standby current stabilizes.
  10. Loosen the nut which holds the negative terminal to the battery. (Model without battery sensor)
  11. Loosen the nut which holds the ground terminal to the battery sensor. (Model with battery sensor)
    NOTE: Do not disconnect the negative terminal or the ground terminal.
    • Model without battery sensor
    Fig 1: Locating Battery Sensor Ground Terminal Nut (Model Without Battery Sensor)
    G10404045Courtesy of SUBARU OF AMERICA, INC.
    • Model with battery sensor
    Fig 2: Locating Battery Sensor Ground Terminal Nut (Model With Battery Sensor)
    G11264820Courtesy of SUBARU OF AMERICA, INC.
  12. Connect the circuit tester positive terminal to the negative terminal. (Model without battery sensor)
  13. Connect the circuit tester positive terminal to the ground terminal. (Model with battery sensor)
    NOTE: To prevent the damage to the circuit tester, set the circuit tester range to a large value first, then gradually change it to smaller values.
  14. Connect the circuit tester negative terminal to the negative terminal installation part of the battery. (Model without battery sensor)
  15. Connect the circuit tester negative terminal to the ground terminal installation part of the battery sensor. (Model with battery sensor)
  16. While connecting the circuit tester positive terminal with the negative terminal as shown in the figure below, remove the negative terminal from the battery. (Model without battery sensor)
  17. While connecting the circuit tester positive terminal with the ground terminal as shown in the figure below, remove the ground terminal from the battery sensor. (Model with battery sensor)
    • Model without battery sensor
    Fig 3: Connecting Circuit Tester Positive Terminal And Ground (Model Without Battery Sensor)
    G10404046Courtesy of SUBARU OF AMERICA, INC.
    • Model with battery sensor
    Fig 4: Connecting Circuit Tester Positive Terminal And Ground (Model With Battery Sensor)
    G11264822Courtesy of SUBARU OF AMERICA, INC.
  18. Check the standby current.
    NOTE:
    • For model with keyless access function, the standby current changes periodically because the keyless access system continuously searches the access key (polling).
    • When measuring the standby current, the reading of the circuit tester oscillates. Therefore, read the average value (median value).

    Check 

    • When the maximum measurement value is less than 70 mA  → Standby current is normal.
    • When the maximum measurement value is 70 mA or more  → Go to step (19).
  19. Remove all fuses one by one to identify which system changes the standby current value significantly. Ref. to WIRING SYSTEM>Power Supply Circuit .
  20. Check the harness and connector of the system whose standby current has changed significantly.
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