Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001N2HE
Model Year Start: 2021 Model: GR Corolla Prod Date Range: [04/2020 - 06/2020]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model (w/o Safe Exit Assist Function)): Buzzer does not Sound; 2021 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 06/2020]

Buzzer does not Sound

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.

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.

NG

GO TO DTC CHART

OK

2.

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

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O143-1 (BZP) - Body ground

Engine Switch on (IG)

11 to 14 V

O143-2 (BZN) or O58-3 (BUZ) - Body ground

Below 1 V

O143-2 (BZN) - O143-1 (BZP)

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

(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

Switch Condition

Specified Condition

O143-2 (BZN) or O58-3 (BUZ) - Body ground

Engine switch on (IG)

Below 1 V

O143-1 (BZP) - Body ground

Engine switch on (IG)

11 to 14 V

O143-1 (BZP) - Body ground

Engine switch off

Below 1 V

OK

REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR