Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJB8
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: C1ABD,C1ABE; Short to +B in Buzzer; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

C1ABD

Short to +B in Buzzer

DTC

C1ABE

Short to GND or Open in Buzzer

DESCRIPTION

  • DTC C1ABD is stored when the blind spot monitor sensor LH detects a +B short in rear cross traffic alert buzzer (blind spot monitor buzzer) circuit.
  • 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

C1ABD

Both of the following conditions are met:

  • Blind spot monitor main switch (warning canceling switch assembly) is on with ignition switch ON.
  • The blind spot monitor sensor is not sending voltage to the buzzer but the buzzer receives voltage above a specified level for a specified period of time.
  • Blind spot monitor sensor LH
  • Rear cross traffic alert buzzer (blind spot monitor buzzer)
  • Harness or connector

C1ABE

Both of the following conditions are met:

  • Blind spot monitor main switch (warning canceling switch assembly) 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 main switch (warning canceling switch assembly) 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 2016 - 2017 MY Sienna [12/2015 - 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

(See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING )
NG

2.

CHECK HARNESS AND CONNECTOR (REAR CROSS TRAFFIC ALERT BUZZER - BATTERY ANDBLIND 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
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 2016 - 2017 MY Sienna [12/2015 - 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