Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Buzzer does not Sound

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Park Assist / Monitoring / Blind Spot Monitor System(for Gasoline Model) / 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 RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Check that the RCTA buzzer (blind spot monitor buzzer) sounds when the initial check is performed.

Click here

OK:

RCTA buzzer sounds

OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

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.

NG

GO TO DTC CHART

OK

3.

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

(a) Disconnect the K22 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

K22-1 (BZP) - Body ground

Engine Switch on (IG)

11 to 14 V

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

Below 1 V

K22-2 (BZN) - K22-1 (BZP)

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

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

(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

Switch Condition

Specified Condition

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

Engine switch on (IG)

Below 1 V

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)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Blind Spot Monitor System(for Gasoline Model)

    Vehicle Speed Sensor (C1A45)

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