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 DIAGNOSISHYBRID DRIVE SYSTEMSTESTING AND INSPECTIONPROGRAMMING AND RELEARNINGHYBRID BATTERY SYSTEM
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Hybrid Battery System
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Hybrid Battery System
PRECAUTION
NOTE: When disconnecting the negative (-) battery cable, initialize the following system after the terminal is reconnected.
System
SFI system
Lighting System
Sliding Roof Control System
Power Window Control System
Power Door Lock System
Power Back Door System
Back Door Closer System
Electrical Back Door Outside Handle System
1. PRECAUTIONS FOR INSPECTING HYBRID BATTERY SYSTEM
a. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
b. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.
c. Wear protective goggles to prevent eye injury from electrolyte leakage when checking inside the HV battery.
d. Wear insulated gloves, turn the ignition switch off, and disconnect the negative terminal of the auxiliary battery before touching any of the orange-colored wires of the high-voltage system.
e. Turn the ignition switch off before performing a resistance check.
f. Turn the ignition switch off before disconnecting or reconnecting any connector.
g. To install the service plug grip, the lever must be flipped down. Without the lever flipped down, the system outputs a DTC pertaining to the interlock switch system.
2. PRECAUTIONS FOR HYBRID CONTROL SYSTEM ACTIVATION
a. When the warning light comes on or the auxiliary battery has been disconnected and reconnected, putting the vehicle into the READY-on state may not start the system on the first attempt. If so, turn the ignition switch off and put the vehicle into the READY-on state again.
NOTE: When disconnecting the negative (-) battery cable, initialize the following system after the terminal is reconnected.
System
SFI system
Lighting System
Sliding Roof Control System
Power Window Control System
Power Door Lock System
Power Back Door System
Back Door Closer System
Electrical Back Door Outside Handle System
1. PRECAUTIONS FOR INSPECTING HYBRID BATTERY SYSTEM
a. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
b. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.
c. Wear protective goggles to prevent eye injury from electrolyte leakage when checking inside the HV battery.
d. Wear insulated gloves, turn the ignition switch off, and disconnect the negative terminal of the auxiliary battery before touching any of the orange-colored wires of the high-voltage system.
e. Turn the ignition switch off before performing a resistance check.
f. Turn the ignition switch off before disconnecting or reconnecting any connector.
g. To install the service plug grip, the lever must be flipped down. Without the lever flipped down, the system outputs a DTC pertaining to the interlock switch system.
2. PRECAUTIONS FOR HYBRID CONTROL SYSTEM ACTIVATION
a. When the warning light comes on or the auxiliary battery has been disconnected and reconnected, putting the vehicle into the READY-on state may not start the system on the first attempt. If so, turn the ignition switch off and put the vehicle into the READY-on state again.
RENDER: 1.0x
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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.