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Hyundai Tucson: Vehicle parasitic current inspection

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Electrical System / Charging System / Vehicle parasitic current inspection

Inspection

Using the Ammeter

  1. Turn the all electric devices OFF, and then turn the ignition switch OFF.
  2. Close all doors except the engine hood, and then lock all doors.

(1) Disconnect the hood switch connector.

(2) Close the trunk lid.

(3) Close the doors or remove the door switches.

  1. Wait for a few minutes until the vehicle's electrical systems go to sleep mode.

WARNING

For an accurate measurement of a vehicle parasitic current, all electrical systems should go to sleep mode. (It takes at least one hour or at most one day.) However, an approximate vehicle parasitic current can be measured after 10-20 minutes.

  1. Connect an ammeter in series between the battery (-) terminal and the ground cable, and then disconnect the clamp from the battery (-) terminal slowly.

WARNING

Be careful that the lead wires of an ammeter do not come off from the battery (-) terminal and the ground cable to prevent the battery from being reset. In case the battery is reset, connect the battery cable again, and then start the engine or turn the ignition switch ON for more than 10 sec. Repeat the procedure from No. 1.

To prevent the battery from being reset during the inspection:

1) Connect a jump cable between the battery (-) terminal and the ground cable.

2) Disconnect the ground cable from the battery (-) terminal.

3) Connect an ammeter between the battery (-) terminal and the ground cable.

4) After disconnecting the jump cable, read the current value of the ammeter.

  1. Read the current value of the ammeter.
  • If the parasitic current is over the limit value, search for abnormal circuit by removing the fuses one by one and checking for parasitic current.
  • Reconnect only the fuse suspected of parasitic current and search for the trouble unit by removing the components connected to the circuit one by one until the parasitic draw drops below limit value

Limit value (after 10 - 20 min.) : Below 50mA

Using the Clamp type Ammeter

  1. Turn the all electric devices OFF, and then turn the ignition switch OFF.
  2. Close all doors except the engine hood, and then lock all doors.

(1) Disconnect the hood switch connector.

(2) Close the trunk lid.

(3) Close the doors or remove the door switches.

  1. Wait for a few minutes until the vehicle's electrical systems go to sleep mode.

WARNING

For an accurate measurement of a vehicle parasitic current, all electrical systems should go to sleep mode. (It takes at least one hour or at most one day.) However, an approximate vehicle parasitic current can be measured after 10 - 20 minutes.

  1. Install the clamp type ammerter on battery negative (-) terminal.

  1. Read the current value of the ammeter.
  • If the parasitic current is over the limit value, search for abnormal circuit by removing the fuses one by one and checking for parasitic current.
  • Reconnect only the fuse suspected of parasitic current and search for the trouble unit by removing the components connected to the circuit one by one until the parasitic draw drops below limit value.

Limit value (after 10 - 20 min.) : Below 50mA

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