The main body ECU (multiplex network body ECU) controls the automatic high beam system based on signals received from the forward recognition camera.
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*
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.
One Time Recognition: Click hereADAS / AD>ADVANCED DRIVER ASSISTANCE SYSTEM>FRONT CAMERA (for NR Series Engine)>ADJUSTMENT (ONE TIME RECOGNITION)202304,999999,_95,_139716,_0584840,RM1000000029I36,
Sequential Recognition: Click hereADAS / AD>ADVANCED DRIVER ASSISTANCE SYSTEM>FRONT CAMERA (for NR Series Engine)>ADJUSTMENT (SEQUENTIAL RECOGNITION)202304,999999,_95,_139716,_0584840,RM1000000029I37,
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.
*: w/ Smart Entry and Start System
Using the GTS, check for Vehicle Control History (RoB).
| Tester Display |
|---|
| Vehicle Control History (RoB) |
| Result | Proceed to |
|---|---|
| Vehicle Control History X204E is not output | A |
| Vehicle Control History X204E is output | B |
A
B
Read the Data List according to the display on the GTS.
| 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 |
When "High Temperature" is displayed, the automatic high beam system is temporarily suspended. |
| Tester Display |
|---|
| Front Recognition Camera High Temperature 2 |
"Not High Temperature" is displayed on the GTS.
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.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the operation of the automatic high beam indicator light.
Turn the ignition switch to ON.
Turn the light control switch to the AUTO or head position.
Move the dimmer switch to the high position.
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 |
A
B
C
D
| *1 | Forward Recognition Camera
(Automatic High Beam Sensor) |
| *2 | Work Light or Equivalent |
| *a | 100 mm or less |
Shine a light on the automatic high beam sensor.
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.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Data List.
Read the Data List according to the display on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Auto H Beam STS0 | Automatic high beam sensor current state | Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Auto H Beam STS0 |
"Daytime" is displayed on the GTS.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| *1 | Cardboard or Equivalent Object |
| *a | 150 mm or more |
| *b | 3 mm or more |
Cover the automatic high beam sensor with an opaque object, such as cardboard.
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.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Data List.
Read the Data List according to the display on the GTS.
As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Auto H Beam STS0 | Automatic high beam sensor current state | Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Auto H Beam STS0 |
"Speed" is displayed on the GTS.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Perform the Active Test according to the display on the GTS.
| 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) |
The automatic high beam indicator illuminates and turns off.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Data List.
Read the Data List according to the display on the GTS.
| 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 |
Normal conditions listed above are displayed.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Data List.
Read the Data List according to the display on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Auto H Beam STS0 | Automatic high beam sensor current state | Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err | Condition can be displayed | - |
| Tester Display |
|---|
| Auto H Beam STS0 |
"Daytime" or "Speed" is displayed on the GTS.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I85 main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I52-5 (+B) - I85-26 (AHBI) | Always | Below 1 Ω |
| I52-5 (+B) or I85-26 (AHBI) - Body ground | Always | 10 kΩ or higher |
| I52-2 (E) - Body ground | Always | Below 1 Ω |
| Proceed to |
|---|
| OK |
| NG |
OK
NG