Tesla Model 3: 12V Power (Disconnect and Connect)

12V Power- Disconnect

SPECIAL TOOLS

Cap, Logic Conn, Inv, 3DU (1108272-00-B)

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 Electrical Isolation Procedure after this procedure, and before servicing high voltage components.

Disconnect

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.

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 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
7. Remove the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
8. On the touchscreen, touch Controls → Safety & Security → Vehicle Power → Power Off.

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.

1. Loosen the nut that attaches the 12V battery negative cable to the battery, and then disconnect the cable from the battery.

2. Remove the foam cover from the RH side of the penthouse.

3. Disconnect the electrical harness from the high voltage controller connector.

Note: The HV battery positive contactor and negative contactor open with a clunk sound.

4. Install the logic connector cap onto the high voltage controller connector to prevent mistaken reconnection and protect the connector.
5. If you disconnected 12V power to service a high voltage component, verify that high voltage power is no longer available to that component. See Vehicle Electrical Isolation Procedure.

12V Power - Connect

Connect

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 penthouse.
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, and then tighten the nut which secures the terminal clamp around the battery post. Ensure that the terminal clamp is fully seated down on the battery post before tightening. Torque 6 Nm
6. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
7. Press the brake pedal to turn on vehicle power.
8. Remove the shop towels from the rear door strikers.
9. Close the rear doors.
10. Return the windows, seats, climate control, audio, and charging to the state before service.