Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001N2HA
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for HV Model (w/o Safe Exit Assist Function)): C1ABE; Short to GND or Open in Buzzer; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

C1ABE

Short to GND or Open in Buzzer

DESCRIPTION

DTC C1ABE is stored when the blind spot monitor sensor RH 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)
  • Blind spot monitor sensor RH
  • 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 RH STATUS)

(a) Connect the Techstream to the DLC3.

(b) Turn the power 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 RH

A

2.

CHECK DTC

(a) Turn the power switch off.

(b) Turn the power 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 - AUXILIARY BATTERY AND BLIND SPOT MONITOR SENSOR RH)

(a) Disconnect the O143 RCTA buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the O58 blind spot monitor sensor RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O143-2 (BZN) - O58-3 (BUZ)

Always

Below 1 Ω

O143-2 (BZN) or O58-3 (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

O143-1 (BZP) - Body ground

Power switch on (IG)

11 to 14 V

O143-1 (BZP) - Body ground

Power switch off

Below 1 V
OK

REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR