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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESCHECK DATA LINK CONNECTOR 3 (DLC3)
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Check Data Link Connector 3 (DLC3)
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Check Data Link Connector 3 (DLC3)
CHECK DLC3 (Data link Connector 3)
The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
HINT: The DLC3 is the interface prepared for reading various data from the vehicle's ECM (Included in HV Control ECU). After connecting the cable of an intelligent tester, turn the ignition switch on and turn the tester ON. If a communication failure message is displayed on the tester screen (on the tester: UNABLE TO CONNECT TO VEHICLE), a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle.
If communication is normal: Inspect the DLC3 on the original vehicle.
If communication is still not possible: The problem is probably in the tester itself. Consult the Service Department listed in the instruction manual.
The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
HINT: The DLC3 is the interface prepared for reading various data from the vehicle's ECM (Included in HV Control ECU). After connecting the cable of an intelligent tester, turn the ignition switch on and turn the tester ON. If a communication failure message is displayed on the tester screen (on the tester: UNABLE TO CONNECT TO VEHICLE), a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle.
If communication is normal: Inspect the DLC3 on the original vehicle.
If communication is still not possible: The problem is probably in the tester itself. Consult the Service Department listed in the instruction manual.
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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.