Toyota Yaris: Lighting System / Automatic High Beam System does not Operate or Operation Indicator does not Illuminate
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the automatic high beam system based on signals received from the forward recognition camera.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
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- When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
-
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.
-
Sequential recognition: Click here
-
One time recognition: Click here
Driving Adjustment: Click here
-
Sequential recognition: Click here
- Before performing troubleshooting, check that the low beam headlights and high beam headlights illuminate correctly.
- When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
- If the forward recognition camera cannot operate due to high vehicle interior temperatures, bad weather (rain, fog, etc.) or fogged up or dirty glass, the automatic high beam system will not operate and the automatic high beam indicator will not illuminate.
-
Before performing troubleshooting, check that the front radar sensor system operates correctly.
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PROCEDURE
| 1. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Chassis > Front Recognition Camera > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Front Recognition Camera High Temperature 2 | Forward recognition camera condition | Not High Temperature or High Temperature | Not High Temperature: 65°C (149°F) or lower High Temperature: 65°C (149°F) or higher | If this item is "High Temperature", the automatic high beam system will be temporarily unavailable. If this does not improve even if the inside of the vehicle is left cooled for at least 10 minutes, the forward recognition camera may be malfunctioning. HINT: In summertime, the windshield glass may reach 100°C (212°F) or higher |
| Tester Display |
|---|
| Front Recognition Camera High Temperature 2 |
OK:
"Not High Temperature" is displayed on the GTS.
HINT:
If "High Temperature" is displayed, move the vehicle to a cool place and allow the temperature of the forward recognition camera to decrease before continuing with troubleshooting.
| NG |
.gif) | END (THE SYSTEM STOPPED OPERATING DUE TO HIGH TEMPERATURES) |
|
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| 2. | CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT |
(a) Check the operation of the automatic high beam indicator light.
(1) Turn the ignition switch to ON.
(2) Turn the light control switch to the AUTO or HEAD position.
(3) Cover the automatic light control sensor to turn the low beam headlights on.
(4) Move the dimmer switch to the low position.
(5) Press the auto high beam switch.
| Result | Proceed to |
|---|---|
| OK (The automatic high beam indicator light and the auto high beam switch indicator illuminate) | A |
| NG (Automatic high beam indicator light does not illuminate) | B |
| NG (Auto high beam switch indicator does not illuminate) | C |
| NG (Automatic high beam indicator light and auto high beam switch indicator do not operate) | D |
| B |
| GO TO STEP 5 |
| C |
| GO TO OTHER PROBLEM (Proceed to Automatic High Beam Switch Indicator does not Come ON) |
| D |
| GO TO STEP 6 |
|
| 3. | READ VALUE USING GTS |
| *1 | Forward Recognition Camera (Automatic High Beam Sensor) |
| *2 | Work Light or Equivalent |
| *a | 100 mm or less |
(a) Shine a light on the automatic high beam sensor (forward recognition camera).
HINT:
If troubleshooting is being performed in a bright area, such as outside on a sunny day, it will not be necessary to perform this step.
(b) Enter the following menus: Body Electrical / Main Body / Data List.
(c) Read the Data List according to the display on the GTS.
HINT:
As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Automatic High Beam Headlights Sensor Detection Status | Automatic high beam sensor state past 1 | Undetected, N/A, No sens, Headlight, Taillight, Speed, Daytime, Village, Other sens, Change, Out of aim, SAE Mod, Aim adjust or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Automatic High Beam Headlights Sensor Detection Status |
OK:
"Daytime" is displayed on the GTS.
| NG |
| REPLACE FORWARD RECOGNITION CAMERA |
|
| 4. | READ VALUE USING GTS |
| *1 | Cardboard or Equivalent Object |
| *a | 150 mm or more |
| *b | 3 mm or more |
(a) Cover the automatic high beam sensor with an opaque object, such as cardboard.
NOTICE:
- Make sure that there is no clearance between the cardboard or equivalent object and the area of the windshield glass in front of the automatic high beam sensor.
- If there is any clearance, light may shine on the automatic high beam sensor and the value of the Data List will not change.
(b) Enter the following menus: Body Electrical / Main Body / Data List.
(c) Read the Data List according to the display on the GTS.
HINT:
As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Automatic High Beam Headlights Sensor Detection Status | Automatic high beam sensor current state | Undetected, N/A, No sens, Headlight, Taillight, Speed, Daytime, Village, Other sens, Change, Out of aim, SAE Mod, Aim adjust or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Automatic High Beam Headlights Sensor Detection Status |
OK:
"Speed" is displayed on the GTS.
| OK |
| USE SIMULATION METHOD TO CHECK |
| NG |
| REPLACE FORWARD RECOGNITION CAMERA |
| 5. | PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Combination Meter > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Automatic High Beam Indicator (Green) | Automatic high beam indicator light | OFF or ON | - |
| Tester Display |
|---|
| Automatic High Beam Indicator (Green) |
OK:
The automatic high beam indicator illuminates and turns off.
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPLACE COMBINATION METER ASSEMBLY |
| 6. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Auto High Beam Main Switch | Auto high beam switch signal | OFF or ON | OFF: Auto high beam switch not pressed ON: Auto high beam switch pressed | - |
| Tester Display |
|---|
| Auto High Beam Main Switch |
OK:
Normal conditions listed above are displayed.
| NG |
| GO TO STEP 9 |
|
| 7. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Automatic High Beam Headlights Sensor Detection Status | Automatic high beam sensor current state | Undetected, N/A, Nosens, Headlight,Taillight, Speed,Daytime, Village,Other sens, Change,Out of aim, SAEMod, Aim adjust or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Automatic High Beam Headlights Sensor Detection Status |
OK:
"Daytime" or "Speed" is displayed on the GTS.
| NG |
| REPLACE FORWARD RECOGNITION CAMERA |
|
| 8. | PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Combination Meter > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Automatic High Beam Indicator (Green) | Automatic high beam indicator light | OFF or ON | - |
| Tester Display |
|---|
| Automatic High Beam Indicator (Green) |
OK:
The automatic high beam indicator illuminates and turns off.
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPLACE COMBINATION METER ASSEMBLY |
| 9. | INSPECT AUTO HIGH BEAM SWITCH |
Click here
| NG |
| REPLACE AUTO HIGH BEAM SWITCH |
|
| 10. | CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) |
(a) Disconnect the H4 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| H47-5 (+B) - H4-14 (AHBI) | Always | Below 1 Ω |
| H47-5 (+B) or H4-14 (AHBI) - Body ground | Always | 10 kΩ or higher |
| H47-2 (E) - Body ground | Always | Below 1 Ω |
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
Automatic High Beam Switch Indicator does not Come ON
DESCRIPTION When the automatic high beam system is on, the main body ECU (multiplex network body ECU) illuminates the auto high beam switch indicator. WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure...
Headlight Dimmer Switch Circuit
DESCRIPTION The steering sensor receives the following switch information:
Light control switch in tail, head or AUTO position
Dimmer switch in high, low or high flash (pass) position
Fog light switch in front or off position
WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to Registration...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Horn System
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Do not drive with the liftgate/trunk lid open
