DESCRIPTION |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area | |
U023A | Lost Communication with Front Camera Module |
When
the engine switch is on (IG), a communication error between the forward
recognition camera and driving support ECU assembly is detected for
approximately 3 seconds. |
- CAN communication system
- CAN bus line
- Forward recognition camera
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- Before measuring the resistance of the CAN bus, turn the engine switch
off and leave the vehicle for 1 minute or more without operating the key
or any switches, or opening or closing the doors. After that,
disconnect the cable from the negative (-) battery terminal and leave
the vehicle for 1 minute or more before measuring the resistance.
- After turning the engine switch off, waiting time may be required before
disconnecting the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the
negative (-) battery terminal notices before proceeding with work.
Click here 
- 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 adjustment.
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HINT:
- Operating the engine switch, any other switches or a door triggers
related ECU and sensor communication on the CAN. This communication will
cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the
vehicle for a while, the malfunction may be occurring due to vibration
of the vehicle. In such a case, wiggling the connectors of ECUs or wire
harnesses while performing the inspection below may help determine the
cause of the malfunction.
PROCEDURE |
1. | READ VALUE USING TECHSTREAM (CAN BUS CHECK) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch to ON.
(c) Turn the Techstream on. (d) Enter the following menus: System Select / Can Bus Check.
Click here CAN Bus Check
|
Result | Proceed to | |
All of the ECUs and sensors that are currently connected to the CAN communication system are displayed |
A | | None
of the ECUs and sensors that are currently connected to the CAN
communication system are displayed, or some of them are not displayed |
B |
| B |
 | GO TO CAN COMMUNICATION SYSTEM |
|
A |
 | |
(a) Check for DTCs. Body Electrical > Pre-Collision 2 > Trouble Codes
|
Result | Proceed to | |
DTC U1002 is not output |
A | | DTC U1002 is output |
B |
| B |
| GO TO DTC CHART (U1002) |
|
A | |
| |
| 3. |
CHECK FOR OPEN IN CAN BUS MAIN LINES (FORWARD RECOGNITION CAMERA) |
(a) Disconnect the cable from the negative (-) battery terminal.
| (b) Disconnect the O5 forward recognition camera connector. |
 |
|
*a | Front view of wire harness connector
(to Forward Recognition Camera) | | |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
O5-6 (CANH) - O5-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | (d) Connect the O5 forward recognition camera connector.
| OK |
| REPLACE FORWARD RECOGNITION CAMERA |
| NG |
| REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) | |
