Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000001983L
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: C1ABE; Short to GND or Open in Buzzer; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1ABE

Short to GND or Open in Buzzer

DESCRIPTION

DTC C1ABE is stored when the blind spot monitor sensor LH detects a ground short or open in rear cross traffic alert buzzer (blind spot monitor buzzer) circuit.

DTC No.

DTC Detection Condition

Trouble Area

C1ABE

Both of the following conditions are met:

  • Blind spot monitor system is on with ignition switch ON.
  • The current flowing to the buzzer is below a specified value when buzzer operation voltage is being sent to the buzzer.
  • Blind spot monitor sensor LH
  • Rear cross traffic alert buzzer (blind spot monitor buzzer)
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot system is on.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs (See page 2018 - 2020 MY Sienna [11/2017 -        ]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DTC CHECK / CLEAR ).

(b) Recheck for DTCs and check if the same DTC is output again.

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (REAR CROSS TRAFFIC ALERT BUZZER - BATTERY AND BLIND SPOT MONITOR SENSOR LH)

(a) Disconnect the L45 rear cross traffic alert buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the q3 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

L45-2 (BZN) - q3-3 (BUZ)

Always

Below 1 Ω

L45-2 (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

Switch Condition

Specified Condition

L45-1 (BZP) - Body ground

Ignition switch ON

11 to 14 V

L45-1 (BZP) - Body ground

Ignition Switch off

Below 1 V

*a

Front view of wire harness connector

(to Rear Cross Traffic Alert Buzzer (Blind Spot Monitor Buzzer))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

REPLACE REAR CROSS TRAFFIC ALERT BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Replace the rear cross traffic alert buzzer (blind spot monitor buzzer) (See page 2016 - 2020 MY Sienna [12/2015 -        ]; PARK ASSIST / MONITORING: REAR CROSS TRAFFIC ALERT BUZZER: REMOVAL ).

NEXT

4.

CHECK DTC

(a) Clear the DTCs (See page 2018 - 2020 MY Sienna [11/2017 -        ]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DTC CHECK / CLEAR ).

(b) Recheck for DTCs and check if the same DTC is output again.

OK:

No DTCs are output.

OK

END (REAR CROSS TRAFFIC ALERT BUZZER (BLIND SPOT MONITOR BUZZER) WAS DEFECTIVE
NG

REPLACE BLIND SPOT MONITOR SENSOR LH