Toyota Yaris: Automatic Light Control Sensor / On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR
(a) Check the wire harness.
(1) Disconnect the automatic light control sensor.
(2) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection | Switch Condition | Specified Condition | H78-1 (CLTB) - H78-2 (CLTE) | Ignition switch on (IG) | 11 to 14 V | If the specified condition is not met, replace the vehicle wire harness. |
| *a | Front view of wire harness connector (Automatic Light Control Sensor) | | |
(b) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Switch Condition | Specified Condition | H78-2 (CLTE) - Body ground | Always | Below 1 Ω | If the specified condition is not met, replace the vehicle wire harness. |
| *a | Front view of wire harness connector (Automatic Light Control Sensor) | | |
(c) Check the automatic light control sensor.
(1) Connect the automatic light control sensor.
(2) Check the waveform. Use the oscilloscope and check the waveform in the terminal spaces.
NOTICE:
With the connector connected as is, check from the rear side of the connector.
*a | Component with harness connected (Automatic Light Control Sensor) | *b | Waveform |
OK:
Tester Connection | Condition | Tool Setting | Specified Condition |
H78-4 (CLTS) - H78-2 (CLTE) | Ignition switch on (IG) | 2 V/DIV.,10 ms/DIV. | Pulse generation (See waveform) |
HINT:
The communication waveform changes according to the surrounding brightness.
If the result is not as specified, the automatic light control sensor may be malfunctioning.
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Other information:
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Before refueling, close all the doors, windows, and the liftgate/trunk
lid, and switch the ignition OFF.
To open the fuel-filler lid, pull
the remote fuel-filler lid release.

To remove the fuel-filler cap, turn it counterclockwise.
Attach the removed cap to the
inner side of the fuel-filler lid.
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