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 MANUALSTOYOTA20034 RUNNER 2WD V6-4.0L (1GR-FE)REPAIR AND DIAGNOSISBODY AND FRAMELOCKSPOWER LOCKSPOWER DOOR LOCK CONTROL MODULETESTING AND INSPECTION
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)
Power Door Lock Control Module: Testing and Inspection
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)SECTION Testing and Inspection
TERMINALS OF ECU
1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU)
a. Disconnect the IB, IE, IF, IH, IK, IL, B4 and B6 J/B connectors, and check the voltage or continuity of each terminal of the vehicle side connectors.
If the result is not as specified, there may be a malfunction on the wire harness side.
b. Reconnect the J/B connectors IB, IE, IF, IH, IK, IL, B4 and B6, and check the voltage of each terminal of the connectors.
If the result is not as specified, the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery. Then repair or replace it if necessary.
2. CHECK MULTIPLEX NETWORK DOOR ECU BACK (BACK DOOR ECU)
a. Disconnect the B8 and B9 ECU connectors, and check the voltage or continuity of 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.
b. Reconnect the connectors, and check the voltage of each terminal of the connectors.
If the result is not as specified, the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery. Then repair or replace it if necessary.
Terminals Of ECU/Pinouts:
1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU)
a. Disconnect the IB, IE, IF, IH, IK, IL, B4 and B6 J/B connectors, and check the voltage or continuity of each terminal of the vehicle side connectors.
Standard:
If the result is not as specified, there may be a malfunction on the wire harness side.
b. Reconnect the J/B connectors IB, IE, IF, IH, IK, IL, B4 and B6, and check the voltage of each terminal of the connectors.
Standard:
If the result is not as specified, the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery. Then repair or replace it if necessary.
Terminals Of ECU/Pinouts:
2. CHECK MULTIPLEX NETWORK DOOR ECU BACK (BACK DOOR ECU)
a. Disconnect the B8 and B9 ECU connectors, and check the voltage or continuity of each terminal of the wire harness side connectors.
Standard:
If the result is not as specified, there may be a malfunction on the wire harness side.
b. Reconnect the connectors, and check the voltage of each terminal of the connectors.
Standard:
If the result is not as specified, the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery. Then repair or replace it if necessary.
RENDER: 1.0x
NO RELATED
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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.