PRE-COLLISION: PRE-COLLISION SYSTEM: U0235; Lost Communication with Cruise Control Front Distance Range Sensor; 2019 - 2020 MY Camry HV [09/2018

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM100000001ETPW
Model Year Start: 2019	Model: Camry HV	Prod Date Range: [09/2018 - 10/2020]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: U0235; Lost Communication with Cruise Control Front Distance Range Sensor; 2019 - 2020 MY Camry HV [09/2018 - 10/2020]

DTC

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

The millimeter wave radar sensor assembly is connected to the skid control ECU (brake booster with master cylinder assembly) via CAN communication. If communication with the skid control ECU (brake booster with master cylinder assembly) stops, the millimeter wave radar sensor assembly stores DTC U0235.

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 skid control ECU (brake booster with master cylinder assembly) is detected for approximately 2 seconds.	Electronically controlled brake system Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

NOTICE:

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.
If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.
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The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
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PROCEDURE

1.	CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
Electronically controlled brake system DTCs are not output	A
Electronically controlled brake system DTCs are output	B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

2.	TEST MODE INSPECTION (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

HINT:

When entering Test Mode (Signal Check), the skid control ECU (brake booster with master cylinder assembly) communicates with the millimeter wave radar sensor assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check).

(a) Procedure to Enter Test Mode (Signal Check)

(1) Turn the power switch off.

(2) Check that the steering wheel is centered.

(3) Check that park (P) is selected.

(4) Connect the Techstream to the DLC3.

(5) Turn the power switch on (IG).

(6) Turn the Techstream on.

(7) Switch the skid control ECU (brake booster with master cylinder assembly) to Test Mode (Signal Check) using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

HINT:

Do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check). If Test Mode (Signal Check) is exited within 5 seconds of entering Test Mode (Signal Check), DTC U0235 may be stored. If DTC U0235 is output after exiting Test Mode (Signal Check), enter Test Mode (Signal Check) again, wait at least 5 seconds, then recheck for DTCs.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Signal Check

(b) Test Mode (Signal Check) Display Check

(1) Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.

HINT:

If the ABS warning light, brake warning light / yellow (minor malfunction) or slip indicator light remains illuminated or does not illuminate when Test Mode (Signal Check) is entered, a component or wire harness may be malfunctioning.

(1) Turn the power switch off and disconnect the Techstream.

3.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Body Electrical > Pre-Collision 2 > Clear DTCs

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the power switch on (IG) and wait 2 seconds or more.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC U0235 is not output	A
DTC U0235 is output	B

END

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY