Toyota Corolla Cross: Light Sensor Circuit Malfunction (B124400)
DESCRIPTION
The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
|---|---|---|---|
|
B124400 | Light Sensor Circuit Malfunction | Detection condition:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
for HEV Model: Click here .gif)
for Gasoline Model: Click here
- *1: w/ Smart Key System
PROCEDURE
|
1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
.gif)
| 2. |
CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Check for DTCs.
Body Electrical > Main Body > Trouble Codes|
Result | Proceed to |
|---|---|
|
B124400 is not output |
A |
| B124400 is output |
B |
| A |
.gif) | USE SIMULATION METHOD TO CHECK |
|
| 3. |
READ VALUE USING GTS |
(a) Cover the automatic light control sensor with an opaque object.
(b) According to the display on the GTS, read the Data List and check that the value of Light Sensor Illuminance changes while performing the following:
(1) Slowly move the opaque object to uncover and then cover the automatic light control sensor.
Body Electrical > Main Body > Data List|
Tester Display | Measurement Item |
Normal Condition | Reference Value |
Diagnostic Note |
|---|---|---|---|---|
|
Light Sensor Illuminance |
Light control sensor illuminance |
0 to 8191 lx or Sensor Fail |
Value is output according to ambient light level |
The displayed value is "0" when no light is detected. |
|
Tester Display |
|---|
| Light Sensor Illuminance |
OK:
The value changes according to the amount the automatic light control sensor is covered.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 4. |
CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the h1 automatic light control sensor connector.
(b) Disconnect the I85 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
h1-1 (CLTB) - I85-8 (CLTB) |
Always | Below 1 Ω |
|
h1-4 (CLTS) - I85-20 (CLTS) |
Always | Below 1 Ω |
|
h1-2 (CLTE) - I85-21 (CLTE) |
Always | Below 1 Ω |
|
h1-1 (CLTB) - Body ground |
Always | 10 kΩ or higher |
|
I85-8 (CLTB) - Body ground |
Always | 10 kΩ or higher |
|
h1-4 (CLTS) - Body ground |
Always | 10 kΩ or higher |
|
I85-20 (CLTS) - Body ground |
Always | 10 kΩ or higher |
|
h1-2 (CLTE) - Body ground |
Always | 10 kΩ or higher |
|
I85-21 (CLTE) - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. |
INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Connect the I85 main body ECU (multiplex network body ECU) connector.
|
*a | Component with harness connected (Main Body ECU (Multiplex Network Body ECU)) |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Switch Condition |
Specified Condition |
|---|---|---|
|
I85-8 (CLTB) - I85-21 (CLTE) |
Ignition switch off | Below 1 V |
|
I85-8 (CLTB) - I85-21 (CLTE) |
Ignition switch ON | 11 to 14 V |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 6. |
INSPECT AUTOMATIC LIGHT CONTROL SENSOR |
Click here
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE AUTOMATIC LIGHT CONTROL SENSOR |
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VEHICLE CONTROL HISTORY (RoB)
VEHICLE CONTROL HISTORY (RoB)
DESCRIPTION
Vehicle Control History (RoB) is a function that captures and stores
ECU data when triggered by specific vehicle behavior.
If the customer states that the engine stalled or will not start, it
may be possible to diagnose the cause of the malfu
Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE
1. INSPECT IGCT RELAY (IGCT)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition Specified Condition
3 - 5 Auxiliary battery voltage
