2026-07-16

12V/LV Power (Disconnect and Connect)

  • 2026-07-16: Added LV measurement at ancillary bay for Model Y Structural Pack
  • 2026-01-26: Deleted steps for Model Y with Lead Acid battery to disconnect the electrical harness to the high voltage controller.
  • 2025-10-30: Added a caution to make sure windows are not moved for at least 1 minute before disconnecting the 12V/LV power.
  • 2025-10-16: Added additional info for disconnecting and connecting 16V Li-ion battery.
  • 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

注意：除非本程序中另有明确规定，否则上述校正代码和 FRT 反映的是执行本程序（包括关联程序）所需的所有工作。除非明确要求，否则请勿堆叠校正代码。 注意：请参阅平均维修工时，深入了解 FRT 及其创建方式。 注意：请参阅人员保护，确保在执行以下程序时穿戴适当的个人防护装备 (PPE)。注意：请参阅查看安全健康的作业规程。

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 (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.
Warning IconA warning icon, calling your attention to a possibly risky situation
CAUTION
Before disconnecting the 12V/LV power, make sure windows are not moved for at least 1 minute. Failure to wait before disconnecting can result in component damage.

扭矩规格

Table 1. 扭矩规格: 12V/LV Power (Disconnect and Connect)
描述 扭矩值 推荐工具 重复使用/更换 备注
(Lead acid) positive/negative cable to the battery terminal
6 Nm (4.4 lbs-ft)
  • 10 毫米深套筒
 重复使用

断开 (Model Y with Lead Acid Battery)

  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. 打开所有车门并降下车窗。
  6. 打开左后和右后车门，将一条车间毛巾夹在车门撞销上，以免闩锁锁定。
  7. Remove the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  8. Remove the rear underhood apron. See #GUID-513C83FE-1D5B-4FC1-B3EA-FA796E158252.
  9. If the vehicle is equipped with HEPA filters, remove the HEPA filter assembly. See .
  10. On the touchscreen, touch Controls > Safety > 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.
  11. 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.
  12. Locate the first responder loop near the top of the RH shock tower.
  13. Slide the red locking tab back, press the black tab, and then disconnect the first responder loop.
  14. Set the multimeter to measure DC voltage, and then measure the voltage across the 12V auxiliary battery terminals.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    If the voltage measured is less than 10 volts or greater than 14 Volts, the multimeter is not measuring reliably and must not be used.
  15. Measure the voltage at the LV busbar at the ancillary bay.
    Informational PurposesAn informational icon, calling your attention
    Note
    Measure voltage at the DC passthrough. If the measured voltage is <1V, continue. If the measured voltage is >10V, wait 2 minutes for the 12V/LV system to drain, and then remeasure. If the voltage is still >10V, the LV system is still up;. Escalate for assistance as the PCS is still supporting the Low Voltage system.
  16. 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.

断开 (Li-Ion)

  1. Disconnect any charging cable.
  2. 打开所有车门并降下车窗。
  3. 打开左后和右后车门，将一条车间毛巾夹在车门撞销上，以免闩锁锁定。
  4. Power off the vehicle from the center display.
  5. Remove the rear apron. See .
  6. Remove the HEPA filter. See .
  7. 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.
      • Release the green locking tab by pulling it outwards (1).
      • Press the black locking tab numbered as "1" (2A), and then pull the black connector lock outwards (2B).
      • Press the black locking tab numbered as "2" (3A), and then pull the black connector lock even further outwards (3B) to fully release the connector.
      • Pull the connector upwards to release it from the LV battery.
  8. 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.
  9. Set the multimeter to measure voltage, and then measure the across the 12V/LV auxiliary battery terminals.
    Informational PurposesAn informational icon, calling your attention
    Note
    If the voltage across the battery terminals is 0, the battery may have switched off internally. Use a 12V Lead Acid battery for testing. For mobile technicians: use the 12V Lead Acid battery in the Mobile Service vehicle.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    If the voltage across the battery terminals is less than 13 volts or greater than 16 volts, the multimeter is not measuring reliably and must not be used.
  10. If installed, remove the foam cover from the RH side of the ancillary bay.
  11. 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.
  12. Install the logic connector cap onto the high voltage controller connector to prevent mistaken reconnection and protect the connector.
  13. For Model Y Structural pack, skip to step 16.
  14. Measure the voltage at the LV busbar at the ancillary bay.
    Informational PurposesAn informational icon, calling your attention
    Note
    Measure voltage at the DC passthrough. If the measured voltage is <1V, continue. If the measured voltage is >10V, wait 2 minutes for the 12V/LV system to drain, and then remeasure. If the voltage is still >10V, the LV system is still up;. Escalate for assistance as the PCS is still supporting the Low Voltage system.
  15. Continue at step 18
  16. Model Y Structural Pack: disconnect the LV power connector to the HV battery.
  17. Measure the voltage at the DC passthrough. Measure the voltage at both the HV battery connector and the DCDC inline connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    If the measured voltage is <1V, continue. If the measured voltage is >10V, wait 2 minutes for the 12V/LV system to drain, and then remeasure. If the voltage is still >10V, the LV system is still up. Escalate for assistance as the PCS is still supporting the Low Voltage system.
  18. If LV 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.

连接 (Model Y with Lead Acid Battery)

  1. Install the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  2. 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.
  3. Connect the 12V battery negative cable to the battery, press down to firmly seat the terminal clamp onto the battery post.
  4. Install the nut that attaches the clamp to the post.
    6 Nm (4.4 lbs-ft)
  5. Install the rear underhood apron. See #GUID-513C83FE-1D5B-4FC1-B3EA-FA796E158252.
  6. Press the brake pedal to turn on vehicle power.
  7. 将车间毛巾从后车门撞销上取下。
  8. Return the windows, seats, climate control, audio, and charging to the state before service.
  9. Close all doors.

连接 (Li-Ion)

  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. Model Y Structural Pack: Connect the LV power connector to the HV battery.
  5. Install the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  6. 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.
  7. 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 to secure the connector.
      • Connect the connector to the LV battery (1).
      • Push the black connector lock fully inwards (2).
      • Push the green locking tab inwards (3) to lock the connector.
  8. Install the HEPA filter. See .
  9. Install the rear apron. See .
  10. 将车间毛巾从后车门撞销上取下。
  11. Return the windows, seats, climate control, audio, and charging to the state before service.
  12. Close all doors.