Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B1YA
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 -           ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model): C1ABE; Short to GND or Open in Buzzer; 2019 - 2022 MY Avalon [04/2018 -        ]

DTC

C1ABE

Short to GND or Open in Buzzer

DESCRIPTION

  • DTC C1ABE is stored when the blind spot monitor sensor LH detects a short to ground or open in the RCTA buzzer (blind spot monitor buzzer) circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1ABE

Short to GND or Open in Buzzer

Both of the following conditions are met:

  • The blind spot monitor system is on
  • The blind spot monitor sensor is not sounding the buzzer but the buzzer receives voltage below a specified level for a specified period of time.
  • RCTA buzzer (blind spot monitor buzzer)
  • Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is turned on.
  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BLIND SPOT MONITOR SENSOR LH STATUS)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Blind Spot Monitor Slave / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Blind Spot Monitor Slave > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Buzzer Connection

Status of the buzzer connection

Valid or Invalid

Valid: Buzzer connection is valid

Invalid: Buzzer connection is invalid

-

Slave Side RCTA Function

Switches the RCTA function on and off

OFF or ON

OFF: RCTA function off

ON: RCTA function on

-

Body Electrical > Blind Spot Monitor Slave > Data List

Tester Display

Buzzer Connection

Slave Side RCTA Function

Result

Proceed to

"Valid" and "ON" is displayed for all items.

A

"Invalid" or "OFF" is displayed.

B
B

REPLACE BLIND SPOT MONITOR SENSOR LH

A

2.

CHECK DTC

(a) Turn the engine switch off.

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

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

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK HARNESS AND CONNECTOR (RCTA BUZZER - BATTERY AND BLIND SPOT MONITOR SENSOR LH)

(a) Disconnect the K22 RCTA buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the P6 blind spot monitor sensor LH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K22-2 (BZN) - P6-3 (BUZ)

Always

Below 1 Ω

K22-2 (BZN) or P6-3 (BUZ) - Body ground

Always

10 kΩ or higher

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

K22-1 (BZP) - Body ground

Engine switch on (IG)

11 to 14 V

K22-1 (BZP) - Body ground

Engine switch off

Below 1 V
OK

REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER) 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; PARK ASSIST / MONITORING: REAR CROSSING TRAFFIC ALERT BUZZER: REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; PARK ASSIST / MONITORING: REAR CROSSING TRAFFIC ALERT BUZZER: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; PARK ASSIST / MONITORING: REAR CROSSING TRAFFIC ALERT BUZZER: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR