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 MANUALSTOYOTA2007HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSIG SIGNAL CIRCUIT
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
IG Signal Circuit
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION IG Signal Circuit
IG Signal Circuit
DESCRIPTION
The multiplex network body ECU determines the ignition position (LOCK, ACC, ON) based on signals from the IG or ACC circuit.
Signals from the unlock warning switch are used to operate the wireless door lock control system functions such as automatic lock and door ajar warning.
INSPECTION PROCEDURE
DESCRIPTION
The multiplex network body ECU determines the ignition position (LOCK, ACC, ON) based on signals from the IG or ACC circuit.
Signals from the unlock warning switch are used to operate the wireless door lock control system functions such as automatic lock and door ajar warning.
Wiring Diagram:
Step 1:
INSPECTION PROCEDURE
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.