Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Short to +B in Buzzer (C1ABD,C1ABE)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Blind Spot Monitor System / Short to +B in Buzzer (C1ABD,C1ABE)

DESCRIPTION

  • DTC C1ABD is stored when the blind spot monitor sensor RH detects a short to +B in the RCTA buzzer (blind spot monitor buzzer) circuit.
  • 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

C1ABD

Short to +B in Buzzer
Both of the following conditions are met:
  • The blind spot monitor system is on
  • The blind spot monitor sensor is attempting to sound the buzzer but the buzzer receives voltage above a specified level for a specified period of time
  • Blind spot monitor sensor RH
  • RCTA buzzer (blind spot monitor buzzer)
  • Wire harness or connector

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.
  • Blind spot monitor sensor RH
  • 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.

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

2.

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

(a) Disconnect the S52 RCTA buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the W2 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

S52-2 (BZN) - W2-3 (BUZ)

Always

Below 1 Ω

S52-2 (BZN) - 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

S52-1 (BZP) - Body ground

Engine switch on (IG)

11 to 14 V

S52-1 (BZP) - Body ground

Engine switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Replace the RCTA buzzer (blind spot monitor buzzer).

REAR CROSSING TRAFFIC ALERT BUZZER (w/o Rear No. 2 Seat): Click here

REAR CROSSING TRAFFIC ALERT BUZZER (w/ Rear No. 2 Seat): Click here

NEXT

4.

CHECK DTC

(a) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Slave > Clear DTCs

(b) 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

END
NG

REPLACE BLIND SPOT MONITOR SENSOR RH

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