| Last Modified: 06-05-2026 | 6.11:8.1.0 | Doc ID: RM100000001CXMH |
| Model Year Start: 2019 | Model: Corolla Hatchback | Prod Date Range: [06/2018 - 01/2019] |
| Title: LIGHTING (EXT): AUTOMATIC LIGHT CONTROL SENSOR: ON-VEHICLE INSPECTION; 2019 MY Corolla Hatchback [06/2018 - 01/2019] | ||
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR
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(a) Disconnect the h1 automatic light control sensor connector. |
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(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
h1-1 (CLTB) - h1-2 (CLTE) |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
11 to 14 V |
Standard Resistance
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
h1-2 (CLTE) - Body ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Connect the h1 automatic light control sensor connector.
(d) Connect an oscilloscope to terminals h1-2 (CLTE) and h1-4 (CLTS) of the automatic light control sensor connector and check the waveform.
|
*a |
Component with harness connected (Automatic Light Control Sensor) |
*b |
Waveform |
OK
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
h1-2 (CLTE) - h1-4 (CLTS) |
Engine 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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