Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018YBT |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 -
] |
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: U0235; Lost Communication with Cruise Control Front Distance Range Sensor; 2018 - 2020 MY Sienna [11/2017 - ] |
DTC
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U0235
|
Lost Communication with Cruise Control Front Distance Range Sensor
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DESCRIPTION
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
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U0235
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Lost Communication with Cruise Control Front Distance Range Sensor
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When the ignition switch is ON, a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.
|
-
Millimeter wave radar sensor assembly CAN branch line or connector
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Millimeter wave radar sensor assembly power source circuit.
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Millimeter wave radar sensor assembly
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
w/ Stop and Start System:
As the millimeter wave radar sensor assembly is supplied power from the engine stop and start ECU, make sure that the stop and start system is not malfunctioning before performing the following inspection procedure.
-
w/o Stop and Start System:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
-
Before measuring the resistance of the CAN bus, turn the ignition 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 ignition 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.
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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 ignition 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.
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READ VALUE USING TECHSTREAM (CAN BUS CHECK)
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / CAN Bus Check.
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Result
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Proceed to
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All of the ECUs and sensors that are currently connected to the CAN communication system are displayed
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A
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None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed
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B
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A
|
|
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2.
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CHECK FOR DTCs (PRE-COLLISION SYSTEM)
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(a) Clear the DTCs.
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(b) Perform the following procedure.
HINT:
If the following procedure is not performed, the previously output DTC cannot be detected.
-
Turn the ignition switch to ON and wait 1 second or more.
(c) Check for DTCs.
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Result
|
Proceed to
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DTC U1002 is not output
|
A
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DTC U1002 is output
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B
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A
|
|
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3.
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CHECK FOR OPEN IN CAN BUS MAIN LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the millimeter wave radar sensor assembly connector.
|
|
*a
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Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly)
|
|
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
|
A77-5 (CA1P) - A77-6 (CA1N)
|
Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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(d) Connect the millimeter wave radar sensor assembly connector.
NG |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)
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OK
|
|
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4.
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CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)
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(a) Disconnect the millimeter wave radar sensor assembly connector.
|
|
*a
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Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly)
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A77-1 (SGND) - Body ground
|
Always
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Below 1 Ω
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(c) Connect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
|
A77-8 (IGB) - Body ground
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Ignition switch ON
|
11 to 14 V
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(e) Connect the millimeter wave radar sensor assembly connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
|
|