2025-06-10

Harness - Ancillary (Long Range) (Remove and Replace)

Correction code NEW 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 ServiceManualFeedback@tesla.com. NOTE: See Personal Protection to make sure wearing proper PPE when performing the below procedure.

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Warning
This procedure is a DRAFT. Although it has been validated, Warnings and Cautions might be missing. Follow safety requirements and use extreme caution when working on or near High Voltage systems and components. Provide corrections and feedback to ServiceDevelopment@teslamotors.com.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Cybertruck electronics are powered by a 48V "mid voltage" or "MV" architecture that is designed to improve efficiency. Servicing MV components requires extra knowledge and care in order to avoid personal and/or vehicular harm. Read and understand MV precautions in Electrical Precautions and make sure any required MV-related training courses have been completed, as applicable.
  • 2025-05-06: Released new procedure.
  1. Raise and support vehicle
    Informational PurposesAn informational icon, calling your attention
    Note
    Set air suspension to "Jack Mode"
  2. Open powered front trunk
    Informational PurposesAn informational icon, calling your attention
    Note
    Via exterior switch or UI
  3. Open tailgate
    Informational PurposesAn informational icon, calling your attention
    Note
    Press button to release
  4. Power down vehicle via UI
    Informational PurposesAn informational icon, calling your attention
    Note
    Verify EPBs are engaged, Select charge port icon to ensure drive state is disengaged then power down vehicle via Controls > Safety > Power Off
  5. Remove rear underhood apron
    Informational PurposesAn informational icon, calling your attention
    Note
    9x clips
  6. Disconnect FRL connector then disconnect MV battery connector
    Informational PurposesAn informational icon, calling your attention
    Note
    2x connectors, Release locking tab then disconnect FRL connector, Slide eCPA to left then lift lever to release MV battery connector, Early production trucks may have black FRL connector, Release eCPA by pushing down to unlock and slide red locking tab, Wait 2 minutes for electrical circuits to discharge before disconnecting modules
  7. Verify operation of multimeter
    Informational PurposesAn informational icon, calling your attention
    Note
    Set multimeter to DC voltage, Confirm multimeter is properly measuring voltage by testing MV battery, Touch lightly and do not damage terminals
  8. Raise vehicle fully
    Informational PurposesAn informational icon, calling your attention
    Note
    Set to a comfortable working height, Lower to locks, Ensure locks engage on both sides to prevent tilting
  9. Remove rear skid plate
    Informational PurposesAn informational icon, calling your attention
    Note
    6x clips, 3x bolts, 15mm, 42 Nm, 5x bolts, 13mm, 28 Nm, 2x bolts, 10mm, 6 Nm
  10. Remove all items from pockets and ensure not wearing metal items
  11. Inspect HV insulating gloves
    Informational PurposesAn informational icon, calling your attention
    Note
    Check gloves for damage prior to use, Refer to service document TN-15-92-003, for information on inspecting HV gloves.
  12. Put on HV insulating gloves and leather over gloves
  13. Verify no HV - Install amp clamp to RDU HV harness
    Informational PurposesAn informational icon, calling your attention
    Note
    Verify meter is zeroed out before performing measurement, Measure single cable. Verify ammeter is installed in correct direction. If current > 0.5A do not proceed with disconnecting HV connector. In this case, start vehicle electrical isolation again to make sure that all was properly shut down. Escalate for assistance as requiredIf current < 0.5A, Ok to disconnect and check voltage at HV plug on the battery side.Release locking tab and rotate the release lever up to disengage the connector, Release harness clip, Do not force the release lever up, Ensure the alignment tabs on the RDU header are not damagedMake sure to wear PPE (HV gloves, safety glasses) when working on high voltage component, Measure B+ to Ground, B- to Ground, B+ to B-, If voltage is greater than 10V, Pack contactors are not open or welded, Stop work and reach out to Service Engineering
  14. Secure RDU header connector to ancillary
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Verify lever is in the upright and open position, Carefully seat connector and allow lever to engage, Fully secure lever and verify red tab is locked, Do not damage any pins
  15. Remove pyro fuse access cover
    Informational PurposesAn informational icon, calling your attention
    Note
    4x bolts, E-Torx 5 lobe, 10 Nm
  16. Remove primary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
  17. Remove secondary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
  18. Remove leather over gloves and HV insulating gloves
  19. Lower vehicle until tires are touching the ground
    Informational PurposesAn informational icon, calling your attention
    Note
    Raise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
  20. Disconnect ancillary bay MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Double locking, Release tab then pivot lever, Release second tab to disengage connector, Wait 1 second between locking tab release to discharge and prevent arcing
  21. Remove bolt securing busbar HV connector lid
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 9 Nm
  22. Remove bolts securing HV connector to DC FC header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 10mm, 9 Nm
  23. Release HV connector from DC FC header
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Use inflatable airbag to suspend busbar assembly above ancillary assembly
  24. Support HV Busbar assembly
    Informational PurposesAn informational icon, calling your attention
    Note
    Suspend assembly to maintain clearance
  25. Remove fast charger header doubler
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, E10 5 Lobe Torx, 10 Nm
  26. Release low voltage header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, EP10, 6 Nm
  27. Release fasteners securing ancillary cover to HV battery
    Informational PurposesAn informational icon, calling your attention
    Note
    22x bolts, E10 5-Lobe, 6 Nm, Use E10 5-Lobe socket without magnet, The fasteners are captive and will stay attached to the penthouse cover, Follow fastening order
  28. Remove ancillary cover
    Informational PurposesAn informational icon, calling your attention
    Note
    Use suction cup and maneuver around busbar and tonneau cage
  29. Inspect HV insulating gloves
    Informational PurposesAn informational icon, calling your attention
    Note
    Check gloves for damage prior to use, Refer to service document TN-15-92-003
  30. Put on HV insulating gloves and leather over gloves
  31. Disconnect PCS MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, 1x zip tie, Slide red lock off of lever, Rotate lever to release connector, Remove zip tie as needed
  32. Release PCS MV harness
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 6 Nm, 2x clips, Move aside as needed
  33. Release MV header
    Informational PurposesAn informational icon, calling your attention
    Note
    4x datums, 1x edge clip, 1x fir tree clip
  34. Release HVC connectors
    Informational PurposesAn informational icon, calling your attention
    Note
    2x clips, 3x connectors, Release connector locks, Depress levers and pull at connector, Do not pull from harnessIf RTV is present at 2 connectors, using a ceramic knife cut through and remove RTV until connector can be disconnected
  35. Release BMB passthrough connectors
    Informational PurposesAn informational icon, calling your attention
    Note
    2x connectors, Release connector locks, Depress levers and pull at connector, Do not pull from harness
  36. Release ACJB LV connector & ACJB to device cluster HV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    2x clips, 2x connectors, Release connector locks, Depress levers and pull at connectors, Do not pull at harness
  37. Remove MV ancillary harness
  38. Poistion MV ancillary harness for install
  39. Secure ACJB LV and HV connectors
    Informational PurposesAn informational icon, calling your attention
    Note
    2x clips, 2x connectors, Secure connector locks
  40. Secure BMB passthrough connectors
    Informational PurposesAn informational icon, calling your attention
    Note
    2x connectors, Secure connector locks, Connectors are poke yoked do not force engagement, Ensure locking tabs are facing front of vehicle when connecting
  41. Secure HVC connectors
    Informational PurposesAn informational icon, calling your attention
    Note
    2x clips, 3x connectors, Release connector locks, Depress levers and pull at connector, Do not pull from harness, Apply sealant to connectors at device cluster if it was present during disassembly
  42. Secure MV header
    Informational PurposesAn informational icon, calling your attention
    Note
    4x datums, 1x edge clip, 1x fir tree clip
  43. Secure PCS MV harness
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 6 Nm, 2x clips
  44. Connect PCS MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, 1x zip tie, Install zip tie onto ECPA latch, PCS header not datumed, Ensure correct orientation and polarity of connection, Harness color red for LV+ and black for LV-, Swing down locking lever, Slide lock fully to engage on top of lever
  45. Install ancillary cover
    Informational PurposesAn informational icon, calling your attention
    Note
    Use suction cup and maneuver around busbar and tonneau cage
  46. Remove leather over gloves and HV insulating gloves
  47. Secure fasteners of cover to HV battery
    Informational PurposesAn informational icon, calling your attention
    Note
    22x bolts, E10 5-Lobe, 6 Nm, Use E10 5-Lobe socket without magnet, The fasteners are captive and will stay attached to the penthouse cover, Follow fastening order
  48. Secure low voltage header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, EP10, 6 Nm
  49. Secure fast charger header doubler
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, E10 5 Lobe Torx, 10Nm
  50. Clean HV connector contact surface of residual Penetrox
    Informational PurposesAn informational icon, calling your attention
    Note
    Allow 1 minute dry time after removing Penetrox, New busbar comes with Penetrox applied to HV connector
  51. Clean busbar HV connector contact surface of residual Penetrox
    Informational PurposesAn informational icon, calling your attention
    Note
    Allow 1 minute dry time after removing Penetrox, It is necessary to clean HV connector during re-use of busbar
  52. Apply Penetrox onto HV connector joints
    Informational PurposesAn informational icon, calling your attention
    Note
    Apply 2 drops of Penetrox A-13 about 5mm in diameter to either side of the hole on both leads, Spread evenly to verify the contact surface is fully covered
  53. Position busbar connector and lower onto HV header
    Informational PurposesAn informational icon, calling your attention
    Note
    Release bungee cord
  54. Install bolts securing charge port busbar kit to HV Header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 10mm, 9 Nm
  55. Inspect HV insulating gloves
    Informational PurposesAn informational icon, calling your attention
    Note
    Check gloves for damage prior to use, Refer to service document TN-15-92-003
  56. Put on HV insulating gloves and leather over gloves
  57. Perform Hioki resistance test at each HV joint from HV busbar lead to bolt head
    Informational PurposesAn informational icon, calling your attention
    Note
    2x HV joints, When using Hioki tester, verify the meter has been properly adjusted and set prior to usageThe acceptable resistance is between 0.050 mΩ (50 μΩ) and 0.195 mΩ (195 μΩ).If the resistance is greater than 0.195 mΩ (195 μΩ), stop work and escalate the Toolbox session.If the resistance is lower than 0.050 mΩ (50 μΩ), reposition the probes and measure again.If the resistance is repeatedly between 0.00 mΩ and 0.050 mΩ (50 μΩ), hioki test passed, proceed to next step
  58. Remove leather over gloves and HV insulating gloves
  59. Install bolt securing busbar HV connector lid
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 9 Nm
  60. Connect Ancillary bay MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, double locking, Rotate lever into 2nd lock, Perform a pull test to ensure connector engaged correctly
  61. Raise vehicle fully
  62. Remove all items from pockets and ensure not wearing metal items
  63. Inspect HV insulating gloves
    Informational PurposesAn informational icon, calling your attention
    Note
    Check gloves for damage prior to use, Refer to service document TN-15-92-003
  64. Put on HV insulating gloves and leather over gloves
  65. Clean mating surface of the pyro
    Informational PurposesAn informational icon, calling your attention
    Note
    Use a non-conductive plastic tool to clean the busbar side, Allow 1 minute for IPA to fully dry, Do not use any other types of cleaner
  66. Install secondary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts
  67. Install primary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts
  68. Perform Hioki resistance test at each HV joint from HV busbar lead to pyro fuse busbar
    Informational PurposesAn informational icon, calling your attention
    Note
    4x HV joints, When using Hioki tester, verify the meter has been properly adjusted and set prior to usageThe acceptable resistance is between 0.050 mΩ (50 μΩ) and 0.195 mΩ (195 μΩ).If the resistance is greater than 0.195 mΩ (195 μΩ), stop work and escalate the Toolbox session.If the resistance is lower than 0.050 mΩ (50 μΩ), reposition the probes and measure again.If the resistance is repeatedly between 0.00 mΩ and 0.050 mΩ (50 μΩ), hioki test passed, proceed to next step
  69. Remove leather over gloves and HV insulating gloves
  70. Install pyro fuse access cover
    Informational PurposesAn informational icon, calling your attention
    Note
    4x bolts, E-Torx 5 lobe, 10 Nm, Ensure seal is fully seated and undamaged, If HV pack is being shipped then pyro fuses must be removed
  71. Install Mid-aero shield
    Informational PurposesAn informational icon, calling your attention
    Note
    6x clips, 3x bolts, 15mm, 70 Nm, 3x bolts, 13mm, 28 Nm, 2x bolts, 10mm, 6 Nm
  72. Lower vehicle until tires are touching the ground
    Informational PurposesAn informational icon, calling your attention
    Note
    Raise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
  73. Install bed floor assembly
    Informational PurposesAn informational icon, calling your attention
    Note
    10x short bolts, 15mm, 56 Nm, 2x long bolts, 15mm, 46Nm, Recommend assistance
  74. Install fastener covers onto bed floor assembly
    Informational PurposesAn informational icon, calling your attention
    Note
    14x covers
  75. Close tailgate
  76. Connect FRL connector then connect MV battery connector
    Informational PurposesAn informational icon, calling your attention
    Note
    2x connectors, Connect FRL connector then secure locking tab, Position lever to secure MV battery connector then slide eCPA to right, Early production trucks may have black FRL connector, If power cycling vehicle then ensure at least 60 seconds has passed since powering down
  77. Install rear underhood apron
    Informational PurposesAn informational icon, calling your attention
    Note
    9x clips, Adjust windshield seal as required
  78. Close powered front trunk
    Informational PurposesAn informational icon, calling your attention
    Note
    Via exterior switch or UI
  79. Remove vehicle from lift
    Informational PurposesAn informational icon, calling your attention
    Note
    Lower rack arms fully and remove them from under vehicle, Remove air suspension from "Jack Mode"