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.
Section 428 (Headlight Beam Level Control System): Inspection
- INSPECT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE
- Check that continuity exists between terminal 2 and 5.
- Check that resistance exists between terminal, as shown in the chart.TERMINAL RESISTANCE
Terminal Resistance Ω 2 - 1 26 - 30 2 - 3 26 - 30 2 - 4 26 - 30 2 - 6 26 - 30 5 - 1 26 - 30 5 - 3 26 - 30 5 - 4 26 - 30 5 - 6 26 - 30 If resistance value is not as specified, replace the actuator.
- Connector disconnected: INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT
Disconnect the connector from the ECU and inspect the connector on the wire harness side, as shown.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR SPECIFIED CONDITIONTester connection Condition Specified condition 1 - 4 Ignition switch OFF 26 - 30 Ω 1 - 5 Ignition switch OFF 26 - 30 Ω 1 - 6 Ignition switch OFF 26 - 30 Ω 1 - 7 Ignition switch OFF 26 - 30 Ω 1 - 17 Ignition switch OFF 26 - 30 Ω 1 - 18 Ignition switch OFF 26 - 30 Ω 1 - 19 Ignition switch OFF 26 - 30 Ω 1 - 20 Ignition switch OFF 26 - 30 Ω 10 - 25 Ignition switch OFF Continuity 21 - 25 Ignition switch OFF Continuity 24 - 25 Ignition switch OFF Continuity 13 - Ground Ignition switch OFF Continuity 26 - Ground Ignition switch OFF Continuity If circuit is not as specified, perform the inspection in the following steps.
- Connector connected: INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT
Connect the connector from the ECU and inspect the connector on the back side, as shown in the chart.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR SPECIFIED CONDITIONTester connection Condition Specified condition 1 - 13 Ignition switch ON Battery positive voltage 4 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 5 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 6 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 7 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 10 - 25 Ignition switch ON Approx. 2.5 V 12 - 13 Ignition switch ON No continuity 26 - Body ground Ignition switch OFF Continuity (w/ Electrical modulated air suspension) 13 - 15 Ignition switch ON and light control switch HEAD Below 1.5 V 17 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 18 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 19 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 20 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation 21 - 25 Ignition switch ON Approx. 2.5 V 24 - 25 Ignition switch ON 5 V 13 - 25 Ignition switch OFF Continuity 13 - Body ground Ignition switch OFF Continuity If the circuit is not as specified, replace the ECU.
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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.