Multiplex Communication System
TERMINALS OF ECUTerminals Of Control Module/Pinouts:
1. INSPECT INSTRUMENT PANEL J/B ASSY (MULTIPLEX NETWORK BODY ECU)
a. Disconnect the B5 ECU, 1D, 1E, 1F, 1M and 1R J/B connectors.
b. Check the voltage and resistance between each terminal of the wire harness side connectors.
If the result is not as specified, there may be a malfunction on the wire harness side.
2. CHECK INTEGRATION SWITCH (w/o LEXUS NAVIGATION SYSTEM)
Terminals Of Control Module/Pinouts:
a. Disconnect the C4 switch connector.
b. Check the voltage and resistance of each terminal of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK NETWORK GATEWAY ECU (w/ LEXUS NAVIGATION SYSTEM)
Terminals Of Control Module/Pinouts:
a. Disconnect the G3 ECU connector.
b. Check the voltage and resistance of each terminal 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 ECM
Terminals Of Control Module/Pinouts:
a. Disconnect the E5, E6 and E7 ECM connectors.
b. Check the voltage and resistance of each terminal of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
5. CHECK TRANSPONDER KEY ECU ASSY
Terminals Of Control Module/Pinouts:
a. Disconnect the T9 ECU connector.
b. Check the voltage and resistance of each terminal 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 MULTIPLEX TILT & TELESCOPIC ECU
Terminals Of Control Module/Pinouts:
a. Disconnect the T4 ECU connector.
b. Check the voltage and resistance of each terminal 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 A/C AMPLIFIER (A/C ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the A8 amplifier connector.
b. Check the voltage and resistance of each terminal 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 OUTER MIRROR CONTROL ECU ASSY (PASSENGER SIDE)
Terminals Of Control Module/Pinouts:
a. Disconnect the R22 ECU connector.
b. Check the voltage and resistance of each terminal 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 OUTER MIRROR CONTROL ECU ASSY (DRIVER SIDE)
Terminals Of Control Module/Pinouts:
a. Disconnect the R21 ECU connector.
b. Check the voltage and resistance of each terminal 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 WINDSHIELD WIPER RELAY ASSY (WIPER ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the A28 relay connector.
b. Check the voltage and resistance of each terminal 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 POSITION CONTROL ECU & SWITCH (POWER SEAT ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the P32 and P33 ECU connectors.
b. Check the voltage and resistance of each terminal 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 MULTIPLEX NETWORK DOOR ECU BACK (BACK DOOR ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the P13 and P14 ECU connectors.
b. Check the voltage and resistance of each terminal 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 POWER WINDOW REGULATOR MASTER SWITCH ASSY
Terminals Of Control Module/Pinouts:
a. Disconnect the P22 switch connector.
b. Check the voltage and resistance of each terminal 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 COMBINATION METER ASSY
Terminals Of Control Module/Pinouts:
a. Disconnect the C8 and C9 meter connectors.
b. Check the voltage and resistance of each terminal 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 AIRBAG SENSOR ASSY (AIRBAG ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the A20 sensor connector.
b. Check the voltage and resistance of each terminal 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 SLIDING ROOF DRIVE GEAR ASSY (SLIDING ROOF ECU (STANDARD TYPE))
Terminals Of Control Module/Pinouts:
a. Disconnect the M12 gear connector.
b. Check the voltage and resistance of each terminal 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 SLIDING ROOF DRIVE GEAR ASSY (SLIDING ROOF ECU (MULTI PANEL MOON ROOF TYPE))
Terminals Of Control Module/Pinouts:
a. Disconnect the M12 ECU connector.
b. Check the voltage and resistance of each terminal of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
18. CHECK RAIN SENSOR
Terminals Of Control Module/Pinouts:
a. Disconnect the R7 sensor connector.
b. Check the voltage and resistance of each terminal of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.
19. CHECK HEADLAMP SWIVEL ECU (AFS ECU)
Terminals Of Control Module/Pinouts:
a. Disconnect the A14 ECU connector.
b. Check the voltage and resistance of each terminal of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.