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 SYSTEMSINFORMATION BUSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERSMULTIPLEX COMMUNICATION SYSTEM
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Multiplex Communication System
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Multiplex Communication System
TERMINALS OF ECU
1. CHECK MULTIPLEX NETWORK GATEWAY ECU
a. Disconnect the G3 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
2. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MULTIPLEX NETWORK BODY ECU)
a. Disconnect the 1E, 1D and 1F junction block connectors.
b. Disconnect the B5 ECU connector.
c. Measure the resistance and voltage of the wire harness side connectors.
If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK CENTER CLUSTER INTEGRATION PANEL (W/O LEXUS NAVIGATION SYSTEM)
a. Disconnect the C4 panel connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
4. CHECK AUTO WIPER ECU
a. Disconnect the A28 and A29 ECU connectors.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be malfunction on the wire harness side.
5. CHECK AFS ECU (W/ ADAPTIVE FRONT-LIGHT SYSTEM)
a. Disconnect the A14 ECU connector.
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
6. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (W/ DRIVING POSITION MEMORY)
a. Disconnect the P32 and P33 ECU connectors.
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
7. CHECK AIR CONDITIONING AMPLIFIER (A/C ECU)
a. Disconnect the A8 amplifier connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
8. CHECK CENTER AIRBAG SENSOR ASSEMBLY
a. Disconnect the A20 sensor connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
9. CHECK COMBINATION METER ASSEMBLY (METER ECU)
a. Disconnect the C8 and C9 meter connectors.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
10. CHECK SLIDING ROOF DRIVE GEAR (SLIDING ROOF CONTROL ECU)
a. Disconnect the M12 driver gear connector.
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
11. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (W/ DRIVING POSITION MEMORY)
a. Disconnect the T4 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
12. CHECK RAIN SENSOR
a. Disconnect the R7 sensor connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
13. CHECK MULTIPLEX NETWORK MASTER SWITCH
a. Disconnect the P22 switch connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
14. CHECK MULTIPLEX BACK DOOR ECU
a. Disconnect the P13 and P14 ECU connectors.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
15. CHECK TRANSPONDER KEY ECU
a. Disconnect the T9 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
16. CHECK OUTER MIRROR CONTROL ECU LH
a. Disconnect the R21 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
17. CHECK OUTER MIRROR CONTROL ECU RH
a. Disconnect the R22 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
1. CHECK MULTIPLEX NETWORK GATEWAY ECU
a. Disconnect the G3 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
2. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MULTIPLEX NETWORK BODY ECU)
a. Disconnect the 1E, 1D and 1F junction block connectors.
b. Disconnect the B5 ECU connector.
c. Measure the resistance and voltage of the wire harness side connectors.
If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK CENTER CLUSTER INTEGRATION PANEL (W/O LEXUS NAVIGATION SYSTEM)
a. Disconnect the C4 panel connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
4. CHECK AUTO WIPER ECU
a. Disconnect the A28 and A29 ECU connectors.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be malfunction on the wire harness side.
5. CHECK AFS ECU (W/ ADAPTIVE FRONT-LIGHT SYSTEM)
a. Disconnect the A14 ECU connector.
Part 1:
Part 2:
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
6. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (W/ DRIVING POSITION MEMORY)
a. Disconnect the P32 and P33 ECU connectors.
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
7. CHECK AIR CONDITIONING AMPLIFIER (A/C ECU)
a. Disconnect the A8 amplifier connector.
Part 1:
Part 2:
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
8. CHECK CENTER AIRBAG SENSOR ASSEMBLY
a. Disconnect the A20 sensor connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
9. CHECK COMBINATION METER ASSEMBLY (METER ECU)
a. Disconnect the C8 and C9 meter connectors.
Part 1:
Part 2:
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
10. CHECK SLIDING ROOF DRIVE GEAR (SLIDING ROOF CONTROL ECU)
a. Disconnect the M12 driver gear connector.
b. Measure the voltage and the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
11. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (W/ DRIVING POSITION MEMORY)
a. Disconnect the T4 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
12. CHECK RAIN SENSOR
a. Disconnect the R7 sensor connector.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
13. CHECK MULTIPLEX NETWORK MASTER SWITCH
a. Disconnect the P22 switch connector.
Part 1:
Part 2:
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
14. CHECK MULTIPLEX BACK DOOR ECU
a. Disconnect the P13 and P14 ECU connectors.
b. Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
15. CHECK TRANSPONDER KEY ECU
a. Disconnect the T9 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
16. CHECK OUTER MIRROR CONTROL ECU LH
a. Disconnect the R21 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
17. CHECK OUTER MIRROR CONTROL ECU RH
a. Disconnect the R22 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
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.