Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGAUXILIARY WATER PUMPSERVICE AND REPAIR
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Auxiliary Water Pump: Service and Repair
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Service and Repair
REMOVAL
1. REMOVE ENGINE ROOM SIDE LH COVER
2. REMOVE ENGINE ROOM COVER SIDE
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
4. REMOVE SERVICE PLUG GRIP
5. DRAIN COOLANT
6. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH
7. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH
8. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY
9. REMOVE WINDSHIELD WIPER MOTOR ASSEMBLY
10. REMOVE COWL TOP PANEL SUB-ASSEMBLY OUTER
11. REMOVE COOL AIR INTAKE DUCT SEAL
12. REMOVE AIR CLEANER CAP W/ INLET
13. REMOVE AIR CLEANER W/ RESONATOR
14. REMOVE INVERTER BRACKET NO.5
15. REMOVE POWER STEERING ECU ASSEMBLY
16. REMOVE CIRCUIT BREAKER SENSOR NO.1
17. REMOVE ENGINE ROOM WIRE NO.2
18. REMOVE INVERTER RESERVE TANK SUBASSEMBLY
19. DISCONNECT WATER HOSE
20. DISCONNECT POWER STEERING ECU BRACKET
21. REMOVE INVERTER COVER
22. VERIFY THAT VOLTAGE OF W/CONVERTER ASSEMBLY IS 0 V
23. REMOVE ENGINE WIRE NO.4
24. DISCONNECT HIGH VOLTAGE CABLE OF THE FRONT MOTOR
25. DISCONNECT MG ECU CONNECTOR
26. DISCONNECT NO.3 WIRE FRAME
27. INSTALL INVERTER COVER
28. SEPARATE RELAY BLOCK ASSEMBLY ENGINE ROOM
29. REMOVE INVERTER BRACKET NO.4
30. REMOVE W/CONVERTER INVERTER ASSEMBLY
31. REMOVE HEATER WATER PUMP ASSEMBLY
a. Release the 2 clamps and wire harness protector.
b. Using pliers, grip the claws of the clip and slide the clip to disconnect the 2 heater water hoses.
NOTE:
- Do not apply any excessive force to the heater water hose.
- Prepare a drain pan or cloth for when the cooling water leaks.
c. Release the connector.
d. Remove the 2 bolts and heater water pump assembly.
INSTALLATION
1. INSTALL HEATER WATER PUMP ASSEMBLY
a. Install the heater water pump assembly with the 2 bolts.
Torque: 9.8 N.m (100 kgf.cm, 87 in.lbf)
b. Install the 2 heater water hoses with the 2 clips.
c. Engage the 2 clamps to install the harness protector
2. INSTALL W/CONVERTER INVERTER ASSEMBLY
3. INSTALL INVERTER BRACKET NO.4
4. INSTALL RELAY BLOCK ASSEMBLY ENGINE ROOM
5. REMOVE INVERTER COVER
6. CONNECT NO.3 WIRE FRAME
7. CONNECT MG ECU CONNECTOR
8. CONNECT ENGINE WIRE NO.4
9. CHECK HIGH VOLTAGE CABLE CONNECTION
10. INSTALL INVERTER COVER
11. INSTALL POWER STEERING ECU BRACKET
12. CONNECT WATER HOSE
13. INSTALL INVERTER RESERVE TANK SUBASSEMBLY
14. CONNECT ENGINE ROOM WIRE NO.2
15. CONNECT CIRCUIT BREAKER SENSOR NO.1
16. INSTALL POWER STEERING ECU ASSEMBLY
17. INSTALL INVERTER BRACKET NO.5
18. INSTALL AIR CLEANER W/ RESONATOR
19. INSTALL AIR CLEANER CAP W/ INLET
20. INSTALL COOL AIR INTAKE DUCT SEAL
21. INSTALL COWL TOP PANEL SUB-ASSEMBLY OUTER
22. INSTALL WINDSHIELD WIPER MOTOR ASSEMBLY
23. INSTALL COWL TOP VENTILATOR LOUVER SUBASSEMBLY
24. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY LH
25. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY RH
26. INSTALL ENGINE ROOM COVER SIDE
27. INSTALL ENGINE ROOM SIDE LH COVER
28. ADD COOLANT
29. ADD ENGINE COOLANT
30. CHECK FOR COOLANT LEAKS
31. CHECK COOLING SYSTEM FOR LEAKS
32. INSTALL SERVICE PLUG GRIP
33. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
34. PERFORM INITIALIZATION
NOTE: Some systems need initialization when disconnecting the cable from the negative battery terminal.
1. REMOVE ENGINE ROOM SIDE LH COVER
2. REMOVE ENGINE ROOM COVER SIDE
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
4. REMOVE SERVICE PLUG GRIP
5. DRAIN COOLANT
6. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH
7. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH
8. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY
9. REMOVE WINDSHIELD WIPER MOTOR ASSEMBLY
10. REMOVE COWL TOP PANEL SUB-ASSEMBLY OUTER
11. REMOVE COOL AIR INTAKE DUCT SEAL
12. REMOVE AIR CLEANER CAP W/ INLET
13. REMOVE AIR CLEANER W/ RESONATOR
14. REMOVE INVERTER BRACKET NO.5
15. REMOVE POWER STEERING ECU ASSEMBLY
16. REMOVE CIRCUIT BREAKER SENSOR NO.1
17. REMOVE ENGINE ROOM WIRE NO.2
18. REMOVE INVERTER RESERVE TANK SUBASSEMBLY
19. DISCONNECT WATER HOSE
20. DISCONNECT POWER STEERING ECU BRACKET
21. REMOVE INVERTER COVER
22. VERIFY THAT VOLTAGE OF W/CONVERTER ASSEMBLY IS 0 V
23. REMOVE ENGINE WIRE NO.4
24. DISCONNECT HIGH VOLTAGE CABLE OF THE FRONT MOTOR
25. DISCONNECT MG ECU CONNECTOR
26. DISCONNECT NO.3 WIRE FRAME
27. INSTALL INVERTER COVER
28. SEPARATE RELAY BLOCK ASSEMBLY ENGINE ROOM
29. REMOVE INVERTER BRACKET NO.4
30. REMOVE W/CONVERTER INVERTER ASSEMBLY
31. REMOVE HEATER WATER PUMP ASSEMBLY
a. Release the 2 clamps and wire harness protector.
b. Using pliers, grip the claws of the clip and slide the clip to disconnect the 2 heater water hoses.
NOTE:
- Do not apply any excessive force to the heater water hose.
- Prepare a drain pan or cloth for when the cooling water leaks.
c. Release the connector.
d. Remove the 2 bolts and heater water pump assembly.
INSTALLATION
1. INSTALL HEATER WATER PUMP ASSEMBLY
a. Install the heater water pump assembly with the 2 bolts.
Torque: 9.8 N.m (100 kgf.cm, 87 in.lbf)
b. Install the 2 heater water hoses with the 2 clips.
c. Engage the 2 clamps to install the harness protector
2. INSTALL W/CONVERTER INVERTER ASSEMBLY
3. INSTALL INVERTER BRACKET NO.4
4. INSTALL RELAY BLOCK ASSEMBLY ENGINE ROOM
5. REMOVE INVERTER COVER
6. CONNECT NO.3 WIRE FRAME
7. CONNECT MG ECU CONNECTOR
8. CONNECT ENGINE WIRE NO.4
9. CHECK HIGH VOLTAGE CABLE CONNECTION
10. INSTALL INVERTER COVER
11. INSTALL POWER STEERING ECU BRACKET
12. CONNECT WATER HOSE
13. INSTALL INVERTER RESERVE TANK SUBASSEMBLY
14. CONNECT ENGINE ROOM WIRE NO.2
15. CONNECT CIRCUIT BREAKER SENSOR NO.1
16. INSTALL POWER STEERING ECU ASSEMBLY
17. INSTALL INVERTER BRACKET NO.5
18. INSTALL AIR CLEANER W/ RESONATOR
19. INSTALL AIR CLEANER CAP W/ INLET
20. INSTALL COOL AIR INTAKE DUCT SEAL
21. INSTALL COWL TOP PANEL SUB-ASSEMBLY OUTER
22. INSTALL WINDSHIELD WIPER MOTOR ASSEMBLY
23. INSTALL COWL TOP VENTILATOR LOUVER SUBASSEMBLY
24. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY LH
25. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY RH
26. INSTALL ENGINE ROOM COVER SIDE
27. INSTALL ENGINE ROOM SIDE LH COVER
28. ADD COOLANT
29. ADD ENGINE COOLANT
30. CHECK FOR COOLANT LEAKS
31. CHECK COOLING SYSTEM FOR LEAKS
32. INSTALL SERVICE PLUG GRIP
33. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
34. PERFORM INITIALIZATION
NOTE: Some systems need initialization when disconnecting the cable from the negative battery terminal.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.