TECHNICAL INSTRUCTIONS
FOR
25LD01
REAR TRACTION MOTOR CABLE CORROSION
CERTAIN 2022-2024 NX350h/ NX450h+, CERTAIN 2023-2024 RX350h,
CERTAIN 2024 RX450h+ VEHICLES

The repair quality of covered vehicles is extremely important to Lexus. All dealership technicians
performing this LSC are required to successfully complete the most current version of the E-Learning
course “Safety Recall and Service Campaign Essentials”. To ensure that all vehicles have the repair
performed correctly, technicians performing this LSC repair are required to currently hold at least one
of the following certification levels:
•
•

LIC209A - Electrified Powertrain Vehicle Repair
or
MCR225A - (Electrified Powertrain Safety and Power Down)

It is the dealership’s responsibility to select technicians with the above certification level or greater to
perform this LSC repair. Carefully review your resources, the technician skill level, and ability before
assigning technicians to this repair. It is important to consider technician days off and vacation
schedules to ensure there are properly trained technicians available to always perform this repair.

1

I.

OPERATION FLOW CHART

The flow chart is for reference only. DO NOT use it in place of the full technical instructions. Follow ALL steps
outlined in the full technical instructions to confirm that the campaign is completed correctly.

Note: If the relevant DTCs are detected after performing the health check, and for any reason, the CSP repair
cannot be performed on that service visit, the codes should NOT be cleared and the customer.

IDENTIFICATION OF AFFECTED VEHICLES
1.

CHECK VEHICLE FOR CAMPAIGN ELIGIBILITY
a. Compare the vehicle's VIN to the VIN listed on the Repair Order to ensure they match.
b. Check the TIS Vehicle Inquiry System to confirm that the VIN is involved in this Campaign and has not
already been completed.

NOTICE:
TMNA warranty will not reimburse dealers for repairs completed on vehicles that are not affected or
were previously completed, even by another dealer.

II. PREPARATION
A. PARTS
Part Number
04004-0714A

Part Description

Quantity

SEAL PACKING 103 (FIPG)

1

PROTECTOR, WIRING HARNESS*

1

Remarks
3 Vehicle Repairs
per Tube
-

* The kit above includes the following parts.
Part Name
COVER, WIRING HARNESS PROTECTOR
PROTECTOR, WIRING HARNESS

Part Number
82815-42R80
82817-4A250

Part Number
04004-7410R

Part Description
REPAIR KIT, WIRE HARNESS*

Quantity
1
1

Quantity
1

Remarks
-

* The kit above includes the following parts.
Part Name
SUPPORT, WIRING HARNESS
TAPE, WIRE HARNESS REPAIR

Part Number
82712-0R110
82997-0R010

Quantity
2
1

B. TOOLS & EQUIPMENT
•
•
•
•
•

GTS+
10mm Socket
Molding Remover Set
Safety Glasses
Phillips Screwdriver

•
•
•
•
•

Voltmeter (Class III 600V Rated)
Insulated Tool Set
Compressed Air Nozzle Gun
¼ Torque Wrench
Protective Gloves

•
•
•
•

Insulated Gloves
Spatula
Heat Gun/ Hair Dryer
Shop Air Blower

C. MATERIALS & SUPPLIES
• Sandpaper (200-400 grit)

• Isopropyl Alcohol Wipes

• Electric Tape

• Brass Bristle Brush

• Masking Tape

1

III. WORK PROCEDURE TABLE OF CONTENTS
BACKGROUND ·································································································· SECTION IV.
SAFETY PRECAUTIONS ······················································································ SECTION V.
CHECK FOR DTCs ······························································································ SECTION Vl.
INSPECT FLOOR UNDER WIRE CONNECTOR ························································ SECTION VIl.
HYBRID VEHICLE POWER DOWN PROCEDURE ···················································· SECTION VIlI.
A. DISCONNECT AUXILIARY BATTERY
• NX350h
• RX350h
B. PERFORM VEHICLE POWER DOWN PROCEDURE
WATERPROOF FLOOR UNDERWIRE CONNECTOR ················································ SECTION IX.
RETURN VEHICLE TO ITS ORIGINAL CONDITION ·················································· SECTION X.
APPENDIX ········································································································· SECTION XI.

IV. BACKGROUND

V. SAFETY PRECAUTIONS
A. PRECAUTIONS WHEN WORKING ON THE HIGH VOLTAGE SYSTEM
• Always remember “SAFETY FIRST”.
• Be extremely careful when handling high voltage components.
• TIC209A or Completion of MCR225C is Required!

1.

CAUTION WITH "WORKING AT HIGH VOLTAGE" SIGN
a. Put a "WORKING AT HIGH VOLTAGE" sign on the roof to caution other technicians.
NOTE: The next page illustrates a caution sign sheet. Print out a copy and use it.

2.

BEWARE OF PERSONAL EFFECTS FOR SHORT-CIRCUIT PREVENTION
NOTE: To prevent short circuits, DO NOT wear metal goods, such as wristwatches or jewelry.

3.

TOOL INSULATION
a. Use insulated tools to prevent a short circuit.

4.

WEAR INSULATING GLOVES
a. Wear insulating gloves to prevent electric shock when working with or around the high-voltage circuit
(orange wires and connectors).
b. DO NOT use wet or damaged insulating gloves.
c. When the insulating gloves are dirty, clean them before using them and follow the instructions in the
glove manual.
d. Use both sets of insulated gloves if possible.

5.

HANDLE PROPERLY THE SERVICE PLUG GRIP
a. Before working with a high-voltage system, disconnect the negative terminal of the auxiliary battery
and then the service plug grip. Wait at least 10 minutes to discharge the high-voltage capacitor inside
the inverter with converter assembly.
b. Keep the removed service plug grip in your pocket to prevent other technicians from accidentally
installing it while servicing the vehicle.

6.
7.

INSULATE AFTER DISCONNECTION OF HIGH VOLTAGE CIRCUIT
Soon after removing the connectors and terminals in a high-voltage system, insulate them with insulation
tape.

8.

CONNECT HIGH VOLTAGE TERMINAL
a. To prevent defects such as burnout due to poor connection, check the following:
• Do not allow any foreign matter or water to enter the inverter with converter assembly.
• Use a torque wrench to check the tightening torques of the terminals.

9.

DO NOT USE AN AIR TOOL OR A POWER TOOL
a. Once the cover is removed, DO NOT use an air or power tool to remove dust.

1

VI. CHECK FOR DTCs
1.

CHECK FOR DTCs
a. Perform Health Check using GTS+
b. Confirm whether any of the following DTCs are present:
DTC:
• P0AA649 (Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure)
• P1C8049 (Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure)
• Check the HV System for any isolation fault codes.

Judgment

DTCs

NO

Not present

YES

Present

Action
Proceed to Section VII.
• If P0AA649 or P1C8049 or AM Static is present: CSP
23LE05 will need to be performed.
• Proceed to Section X.
• If any other HV System isolation fault codes are present:
Codes must be diagnosed and repaired prior to performing
this LSC.

VII. INSPECT FLOOR UNDER WIRE CONNECTOR
1. REMOVE THE NO. 1 FLOOR UNDER COVER (IF APPLICABLE)
a. Raise the vehicle on a lift.
b. Remove the (3) bolts, (3) clips, and No. 1 floor under cover from
the rear suspension member sub-assembly.
DO NOT touch the floor under wire harness or the
connector.

2. VISUALLY INSPECT THE FLOOR UNDER WIRE CONNECTOR
a. Confirm if the vehicle has the updated floor under wire harness connector currently installed.
DO NOT touch the floor under wire harness or the connector. Only a visual inspection of
the connector housing will be performed.
Does the vehicle currently have the updated connector installed?
• UPDATED: LSC not applicable. Return the vehicle to its original condition, then return the vehicle to
the customer.
• NON-UPDATED: Proceed to Section VIII: Hybrid Vehicle Power Down Procedure.

Updated connector has a protruding
orange seal present.

Non-updated connector has a flush black
seal present.

VIII. HYBRID VEHICLE POWER DOWN PROCEDURE
A.

DISCONNECT AUXILIARY BATTERY

NX350h & NX450h+
1. PLACE THE PROVIDED CAUTION SIGN ON THE ROOF OF
THE VEHICLE
a. Put a "CAUTION HIGH-VOLTAGE DO NOT TOUCH" sign on the
roof to caution other technicians.
NOTE: A safety precautions sheet is available in Section VI, SAFETY
PRECAUTIONS. Make a copy and use it when you work.

2. REMOVE DECK BOARD ASSEMBLY
a. Remove the deck board assembly.

3. REMOVE REAR NO. 2 FLOORBOARD
a. Detach the (2) clips and (2) guides and remove the luggage trim
service hole cover.

4. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY
TERMINAL
a. Loosen the nut and disconnect the cable from the negative (-)
auxiliary battery terminal.

RX350h & RX450h+
1. PLACE THE PROVIDED CAUTION SIGN ON THE ROOF OF
THE VEHICLE
a. Put a "CAUTION HIGH-VOLTAGE DO NOT TOUCH" sign on the
roof to caution other technicians.
NOTE: A safety precautions sheet is available in Section VI, SAFETY
PRECAUTIONS. Make a copy and use it when you work.

2. REMOVE DECK BOARD ASSEMBLY
a. Remove the deck board assembly.

3. REMOVE REAR NO. 2 FLOORBOARD
a. Detach the (4) clips and (2) guides and remove the luggage trim
service hole cover.

4. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY
TERMINAL
a. Loosen the nut and disconnect the cable from the negative (-)
auxiliary battery terminal.

B.

PERFORM POWER DOWN PROCEDURE

1. REMOVE SERVICE PLUG GRIP
CAUTION: Be sure to wear insulated gloves.
a. Refer to the following Repair Manual link for the proper
procedure:
HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP:
REMOVAL:
• NX350h: 2022-2025
• RX350h: 2023-2024