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.
2000 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Integration Relay Circuit
Remove integration relay. See COMPONENT LOCATIONS . Using DVOM, check circuit values at appropriate connector terminals of integration relay. See Fig 1 and Fig 2 . Ensure circuit values are as specified. See appropriate INTEGRATION RELAY CIRCUIT VALUES table. If circuit values are as specified, replace integration relay. If circuit values are not as specified, repair circuit as necessary.
INTEGRATION RELAY CIRCUIT VALUES (JUNCTION BLOCK SIDE)
| Tester Connection | Condition | Circuit Value |
|---|---|---|
| 1 & Ground | Constant | Battery Voltage |
| 2 & Ground | Constant | Battery Voltage |
| 4 & Ground | All Doors Closed (Except Driver's Door) | No Continuity |
| 4 & Ground | One Door Open (Except Driver's Door) | Continuity |
| 5 & Ground | Key Unlock Warning Switch In OFF Position | No Continuity |
| 5 & Ground | Key Unlock Warning Switch In ON Position | Continuity |
| 6 & Ground | Driver's Door Closed | No Continuity |
| 6 & Ground | Driver's Door Open | Continuity |
| 7 & Ground | Ignition Switch In LOCK Or ACC Position | No Voltage |
| 7 & Ground | Ignition Switch In ON Position | Battery Voltage |
| 8 & Ground | Seat Belt Unfastened | No Continuity |
| 8 & Ground | Seat Belt Fastened | Continuity |
| 9 & Ground | Ignition Switch In LOCK Or ACC Position | No Voltage |
| 9 & Ground | Ignition Switch In ON Position | Battery Voltage |
| 10 & Ground | Constant | Continuity |
| 11 & Ground | Ignition Switch In LOCK Position | No Voltage |
| 11 & Ground | Ignition Switch In ACC or ON Position | Battery Voltage |
INTEGRATION RELAY CIRCUIT VALUES (HARNESS SIDE)
| Tester Connection | Condition | Circuit Value |
|---|---|---|
| A1 & Ground | Constant | Battery Voltage |
| A3 & Ground | Constant | Continuity |
| A5 & Ground | Driver's Door Closed | No Continuity |
| A5 & Ground | Driver's Door Open | Continuity |
| A6 & Ground | Passenger's Door Closed | No Continuity |
| A6 & Ground | Passenger's Door Open | Continuity |
| A7 & Ground | Passenger's Door Closed | No Continuity |
| A7 & Ground | Passenger's Door Open | Continuity |
| A8 & Ground | Engine Running | Battery Voltage |
| A9 & Ground | Rear Door Closed | No Continuity |
| A9 & Ground | Rear Door Open | Continuity |
| A11 & A12 | Constant | Continuity |
| A12 & A25 | Constant | Continuity |
| A13 & Ground | Light Control Switch in AUTO Position | No Continuity |
| A13 & Ground | Light Control Switch In OFF, TAIL Or HEAD Position | Continuity |
| A14 & Ground | Light Control Switch In OFF Position | No Continuity |
| A14 & Ground | Light Control Switch In HI Or FLASH Position | Continuity |
| A15 & Ground | Trunk Compartment Closed | No Continuity |
| A15 & Ground | Trunk Compartment Open | Continuity |
| A16 & Ground | Door Lock Manual Switch In OFF Or UNLOCK Position | No Continuity |
| A16 & Ground | Door Lock Manual Switch In LOCK Position | Continuity |
| A17 & Ground | Door Lock Manual Switch In OFF Or LOCK Position | No Continuity |
| A17 & Ground | Door Lock Manual Switch In UNLOCK Position | Continuity |
| A18 & Ground | Driver's & Passenger's Door Key Lock/Unlock Switch In OFF Or UNLOCK Position | No Continuity |
| A18 & Ground | Driver's & Passenger's Door Key Lock/Unlock Switch In LOCK Position | Continuity |
| A19 & Ground | Driver's Door Key Lock/Unlock Switch In OFF Or LOCK Position | No Continuity |
| A19 & Ground | Driver's Door Key Lock/Unlock Switch In UNLOCK Position | Continuity |
| A20 & Ground | Passenger's Door Key Lock/Unlock Switch In OFF Or LOCK Position | No Continuity |
| A20 & Ground | Passenger's Door Key Lock/Unlock Switch In UNLOCK Position | Continuity |
| A22 & Ground | Parking Brake Switch In OFF Position | No Continuity |
| A22 & Ground | Parking Brake Switch In ON Position | Continuity |
| A24 & Ground | Brake Fluid Level Float Up | No Continuity |
| A24 & Ground | Brake Fluid Level Float Down | Continuity |
| B2 & Ground | Light Control Switch In OFF Position | No Continuity |
| B2 & Ground | Light Control Switch In TAIL Or HEAD Position | Continuity |
| B5 & Ground | Light Control Switch In OFF Or TAIL Position | Continuity |
| B5 & Ground | Light Control Switch In HEAD Position | Continuity |
Factory Service Tools
Use the Manual With the Right Hardware
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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.