19/01/2024 07:47:20

12V/LV Power (Disconnect and Connect)

  • 2024-01-19: Added info for different Li-Ion battery types.
  • 2023-10-4: Added step to disconnect charge cable in Li-Ion disconnect section.
Correction Codes and FRTs

NOTE: Unless otherwise explicitly stated in the procedure, the above correction code and FRT reflect all of the work required to perform this procedure, including the linked procedures. Do not stack correction codes unless explicitly told to do so.NOTE: See Flat Rate Times to learn more about FRTs and how they are created. To provide feedback on FRT values, email LaborTimeFeedback@tesla.com. NOTE: See Personal Protection to make sure wearing proper PPE when performing the below procedure.

  • 1108272-00-B Cap, Logic Conn, Inv, 3DU (For Original Model 3)
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
This procedure disables 12V power, but does not verify that high voltage power is no longer available to high voltage components (PTC heater, A/C compressor, inverters, etc). Perform Vehicle HV Disablement Procedure after this procedure, and before servicing high voltage components.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Failure to follow the exact order of steps in this procedure may cause permanent damage to the car computer.

Torque Specifications

Table 1. Torque Specifications: 12V/LV Power (Disconnect and Connect)
Description Torque Value Recommended Tools Reuse/Replace Notes
(Lead acid) positive/negative cable to the battery terminal
6 Nm (4.4 lbs-ft)
  • 10 mm deep socket
  • ¼ in std ratchet
  • 4 in extension
Reuse

Disconnect (Original Model 3)

  1. Warning IconA warning icon, calling your attention to a possibly risky situation
    Warning

    Prepare for these conditions before disconnecting 12V power:

    • Closed windows might shatter if the door is opened.

    • Closed doors might cause a lockout condition.

    • Airbags do not deploy.

    • Systems, displays, and other controls are off.

  2. Disconnect any charging cable.
  3. On the touchscreen, power off the climate control system, and wait at least 30 seconds for the climate control system to completely shut down.
  4. Make sure the vehicle is in Park.
  5. Fully lower all door windows to avoid glass shatter and door lockout conditions.
  6. Open the LH and RH rear doors, and then pass a shop towel halfway through each door striker to prevent the latch from securing.
  7. Remove the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  8. Remove the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  9. On the touchscreen, touch Controls > Safety & Security > Vehicle Power > Power Off.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not proceed until the climate control system has been powered off for at least 30 seconds. Do not disconnect 12V power while the climate control system is operational.
  10. Loosen the nut that attaches the 12V battery negative cable to the battery, and then disconnect the cable from the battery.
  11. Remove the foam cover from the RH side of the ancillary bay.
  12. Disconnect the electrical harness from the high voltage controller connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    The HV battery positive contactor and negative contactor open with a clunk sound.
  13. Install the logic connector cap onto the high voltage controller connector to prevent mistaken reconnection and protect the connector.
  14. Before continuing, wait 2 minutes for the electrical system to fully discharge.
  15. If 12V power was disconnected to service a high voltage component, verify that high voltage power is no longer available to that component. See Vehicle HV Disablement Procedure.

Disconnect (Heat Pump Model 3 with Lead Acid Battery)

  1. Disconnect any charging cable.
  2. On the touchscreen, power off the climate control system, and wait at least 30 seconds for the climate control system to completely shut down.
  3. Make sure the vehicle is in Park.
  4. Fully lower all door windows to avoid glass shatter and door lockout conditions.
  5. Open the LH and RH rear doors, and then pass a shop towel halfway through each door striker to prevent the latch from securing.
  6. Remove the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  7. On the touchscreen, touch Controls > Safety & Security > Vehicle Power > Power Off.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not proceed until the climate control system has been powered off for at least 30 seconds. Do not disconnect 12V power while the climate control system is operational.
  8. Loosen the nut that attaches the 12V battery negative cable to the battery, and then disconnect the cable from the battery.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Disconnect 12V battery negative cable before disconnecting the first responder loop.
  9. Locate the first responder loop next to the RH side of the 12V auxiliary battery.
  10. Slide the red locking tab back, press the black tab, and then disconnect the first responder loop.
  11. Before continuing, wait 2 minutes for the electrical system to fully discharge.
  12. If 12V power was disconnected to service a high voltage component, verify that high voltage power is no longer available to that component. See Vehicle HV Disablement Procedure.

Disconnect (Li-Ion)

  1. Disconnect any charging cable.
  2. Open the LH front door and lower the LH front window.
  3. Power off the vehicle from the center display.
  4. Remove the rear apron. See Underhood Apron - Rear (Remove and Replace).
  5. Disconnect the LV battery connector from the LV battery: release the green locking tab, pull the black connector lock outwards to release the connector, and then pull up to disconnect the connector.
  6. Disconnect the first responder loop.
    Informational PurposesAn informational icon, calling your attention
    Note
    Before proceeding to service the vehicle, allow 2 minutes for all electrical circuits to discharge.
  7. If 12V power was disconnected to service a high voltage component, verify that high voltage power is no longer available to that component. See Vehicle HV Disablement Procedure.

Connect Original Model 3

  1. Remove the logic connector cap from the high voltage controller connector.
  2. Connect the electrical harness to the high voltage controller connector.
  3. Install the foam cover to the RH side of the ancillary bay.
  4. Install the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  5. Connect the 12V battery negative cable to the battery, press down to firmly seat the terminal clamp onto the battery post.
  6. Install the nut that attaches the clamp to the post.
    6 Nm (4.4 lbs-ft)
  7. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  8. Press the brake pedal to turn on vehicle power.
  9. Remove the shop towels from the rear door strikers.
  10. Close the rear doors.
  11. Return the windows, seats, climate control, audio, and charging to the state before service.

Connect (Heat Pump Model 3 with Lead Acid Battery)

  1. Connect the first responder loop, and then slide the red locking tab forward to lock the connector.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not reconnect the 12V negative terminal until the first responder loop is connected.
  2. Connect the 12V battery negative cable to the battery, press down to firmly seat the terminal clamp onto the battery post.
  3. Install the nut that attaches the clamp to the post.
    6 Nm (4.4 lbs-ft)
  4. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  5. Press the brake pedal to turn on vehicle power.
  6. Remove the shop towels from the rear door strikers.
  7. Close the rear doors.
  8. Return the windows, seats, climate control, audio, and charging to the state before service.

Connect (Li-Ion)

  1. Connect the first responder loop.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Connect the first responder loop BEFORE connecting the LV battery connector.
  2. Connect the LV battery connector to the LV battery: insert the connector, then push the black connector lock inwards to engage the connector, and then seat the green locking tab after lock is fully secured.
  3. Install the rear apron. See Underhood Apron - Rear (Remove and Replace).
  4. Raise the LH front window.