DESCRIPTION |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area | |
U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
When
the power switch is on (IG), a communication error between the
millimeter wave radar sensor assembly and the driving support ECU
assembly is detected for approximately 1 second. |
- CAN communication system
- CAN bus line
- Millimeter wave radar sensor assembly
- Driving support ECU assembly
| 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 power 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 (-) auxiliary battery terminal
and leave the vehicle for 1 minute or more before measuring the
resistance.
- After turning the power switch off, waiting time may be required before
disconnecting the cable from the negative (-) auxiliary battery
terminal. Therefore, make sure to read the disconnecting the cable from
the negative (-) auxiliary battery terminal notices before proceeding
with work.
Click here 
- When replacing the driving support ECU assembly, always replace it with a
new one. If a driving support ECU assembly which was installed to
another vehicle is used, the information stored in the driving support
ECU assembly will not match the information from the vehicle. As a
result, a DTC may be stored.
- When replacing the millimeter wave radar sensor assembly, always replace
it with a new one. If a millimeter wave radar sensor assembly which was
installed to another vehicle is used, the information stored in the
millimeter wave radar sensor assembly will not match the information
from the vehicle. As a result, a DTC may be stored.
- When the millimeter wave radar sensor assembly is replaced with a new
one, adjustment of the radar sensor beam axis must be performed.
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HINT:
- Operating the power switch, any other switches or a door triggers
related ECUs and sensors to communicate using the CAN communication
system. 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 power 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 (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
| (b) Disconnect the A25 millimeter wave radar sensor assembly connector. |
 |
|
*a | Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly) | | |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A25-5 (CA1P) - A25-6 (CA1N) |
Cable disconnected from negative (-) auxiliary battery terminal |
108 to 132 Ω | (d) Connect the A25 millimeter wave radar sensor assembly connector.
| NG |
| REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
OK | |
| |
(a) Check for DTCs. Chassis > Front Recognition Camera > Trouble Codes
|
Result | Proceed to | |
DTC U0235 is not output |
A | | DTC U0235 is output |
B |
| A |
| REPLACE DRIVING SUPPORT ECU ASSEMBLY |
| B |
| REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY | |
