Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B1XI
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 -           ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model): C1AB8; Destination Information Undefined; 2019 - 2022 MY Avalon [04/2018 -        ]

DTC

C1AB8

Destination Information Undefined

DESCRIPTION

This DTC is stored when correct destination information is not sent from the main body ECU (multiplex network body ECU) and destination information cannot be confirmed after a blind spot monitor sensor has been replaced.

Blind Spot Monitor Master

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AB8

Destination Information Undefined

The blind spot monitor sensor cannot communicate with the main body ECU
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Blind spot monitor sensor RH

Blind Spot Monitor Slave

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AB8

Destination Information Undefined

The blind spot monitor sensor cannot communicate with the main body ECU
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Blind spot monitor sensor LH

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is turned on.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    w/ Smart Key System: Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Avalon [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

CHECK DTC

(a) Check for CAN communication system DTCs.

Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2021 MY Avalon [08/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2022 MY Avalon [08/2021 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

OK:

CAN communication system DTCs are not output.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

2.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Replace the main body ECU (multiplex network body ECU) with a new or known good one.

Click here 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NEXT

3.

RECHECK DTC

(a) Recheck for DTCs and check if the same DTC is output again.

Body Electrical > Blind Spot Monitor Master > Trouble Codes

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

Result

Proceed to

No DTCs are output

A

DTC C1AB8 is output ("Blind Spot Monitor Master")

B

DTC C1AB8 is output ("Blind Spot Monitor Slave")

C
A

END
B

REPLACE BLIND SPOT MONITOR SENSOR RH

C

REPLACE BLIND SPOT MONITOR SENSOR LH