Lexus ES manuals

Lexus ES: 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 LH)

(a) Disconnect the N28 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

N28-1 (BZP) - Body ground

Engine Switch on (IG)

11 to 14 V

N28-2 (BZN) or R5-3 (BUZ) - Body ground

Below 1 V

N28-2 (BZN) - N28-1 (BZP)

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

(a) Disconnect the N28 RCTA buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the R5 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

N28-2 (BZN) - R5-3 (BUZ)

Always

Below 1 Ω

N28-2 (BZN) or R5-3 (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

N28-2 (BZN) or R5-3 (BUZ) - Body ground

Engine switch on (IG)

Below 1 V

N28-1 (BZP) - Body ground

Engine switch on (IG)

11 to 14 V

N28-1 (BZP) - Body ground

Engine switch off

Below 1 V

OK

REPLACE BLIND SPOT MONITOR BUZZER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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