Toyota Avalon Service & Repair Manual: Lost Communication with Driving Support ECU (U1104)

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Front Camera System(for Gasoline Model) / Lost Communication with Driving Support ECU (U1104)

DESCRIPTION

The forward recognition camera communicates with the driving support ECU assembly via CAN communication. If there is a communication error with the driving support ECU assembly, the forward recognition camera store DTC U1104.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U1104

Lost Communication with Driving Support ECU

2 seconds after the engine switch is turned on (IG), a communication error between the driving support ECU assembly and the forward recognition camera is detected for approximately 5 seconds.

  • CAN communication system
  • CAN bus line
  • Driving support ECU assembly
  • Forward recognition camera

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • 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 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.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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

2.

CHECK CAN BUS LINE

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Disconnect the O5 forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

(d) 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

HINT:

If the result is not as specified, a malfunction in a CAN communication line is suspected.

(e) Connect the O5 forward recognition camera connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (CAN BUS LINE)

OK

3.

CHECK FOR DTCs

(a) Check for DTCs.

Chassis > Front Recognition Camera > Trouble Codes

Result

Proceed to

Only DTC U1104 is output

A

DTC U0235 and U1104 are output

B

B

REPLACE FORWARD RECOGNITION CAMERA

A

4.

CHECK FOR DTCs

(a) Check for DTCs.

HINT:

The malfunction area can be determined by the combination of DTCs output at the same time.

Body Electrical > Pre-Collision 2 > Trouble Codes Chassis > Front Recognition Camera > Trouble Codes

Result

Proceed to

Front camera system (Front Recognition Camera) DTC U1104 and pre-collision system (Pre-Collision 2) DTC U1002 are output.

A

Front camera system (Front Recognition Camera) DTC U1104 and pre-collision system (Pre-Collision 2) DTC U1104 are output.

B

Only front camera system (Front Recognition Camera) DTC U1104 is output.

C

A

GO TO PRE-COLLISION SYSTEM

B

REPLACE DRIVING SUPPORT ECU ASSEMBLY

C

REPLACE FORWARD RECOGNITION CAMERA

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