Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018KEB
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1232,C1243,C1245; Acceleration Sensor Stuck Malfunction; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1232

Acceleration Sensor Stuck Malfunction

DTC

C1243

Acceleration Sensor Stuck Malfunction

DTC

C1245

Acceleration Sensor Output Malfunction

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).

If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, the DTC U0124 (malfunction in CAN communication with the acceleration sensor) is output.

These DTCs are also output when calibration has not been completed.

DTC No.

DTC Detection Condition

Trouble Area

C1232

At a vehicle speed of 10 km/h (6 mph) or more, either GL1 or GL2 (input signal) does not change for 30 seconds or more.

  • Acceleration sensor (airbag sensor assembly)
  • Acceleration sensor (airbag sensor assembly) circuit
  • Sensor installation

C1243

Any of the following is detected:

  • Output values of GL1 and GL2 do not change 16 times or more while vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph).
  • Output values of GL1 and GL2 (front and rear, left and right) are outside permitted output range for 60 seconds or more.
  • Left and right output values of GL1 and GL2 are outside permitted output range for 60 seconds or more.
  • Acceleration sensor (airbag sensor assembly)
  • Acceleration sensor (airbag sensor assembly) circuit
  • Sensor installation

C1245

At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.

  • Acceleration sensor (airbag sensor assembly)
  • Acceleration sensor (airbag sensor assembly) circuit
  • Sensor installation

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).

HINT:

When U0124 is output together with C1232, C1243, and/or C1245, inspect and repair the trouble areas indicated by U0124 first (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: U0073,U0100,U0124,U0126; Control Module Communication Bus OFF ).

PROCEDURE

1.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: INSTALLATION ).

OK:

The sensor should be tightened to the specified torque.

The sensor should not be installed in a tilted position.

NOTICE:

Check the yaw rate and acceleration sensor signal after replacement (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE ).

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY