Toyota Avalon Service & Repair Manual: Yaw Rate Sensor Circuit (C1AA4,C1AA5)

DESCRIPTION

The forward recognition camera receives vehicle stability signals from the yaw rate sensor (airbag ECU assembly). If the yaw rate sensor (airbag ECU assembly) detects an abnormal yaw rate sensor signal or yaw rate sensor power supply voltage, it informs the forward recognition camera via CAN communication, and DTC C1AA4 or C1AA5 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AA4

Yaw Rate Sensor Circuit

When all of the following conditions are met:

  • 2 seconds after the engine switch is turned on (IG)
  • The vehicle speed is 1 km/h or 1 mph or more.
  • A signal from the yaw rate sensor (airbag ECU assembly) indicating a malfunction in the yaw rate sensor is detected by the forward recognition camera for 5 seconds or more.

Electronically controlled brake system

C1AA5

Yaw Rate Sensor Power Supply Voltage Circuit

When all of the following conditions are met:

  • 2 seconds after the engine switch is turned on (IG)
  • The vehicle speed is 1 km/h or 1 mph or more.
  • A signal from the yaw rate sensor (airbag ECU assembly) indicating an abnormal yaw rate sensor power supply voltage signal is detected by the forward recognition camera for 5 seconds or more.

Electronically controlled brake system

CAUTION / NOTICE / HINT

NOTICE:

The lane departure alert system (w/ steering control) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Click here

PROCEDURE

1.

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

HINT:

If DTC C1AA4 or C1AA5 is output by the lane departure alert system (w/ steering control), perform troubleshooting for the electronically controlled brake system.

Click here

NEXT

END

    Vehicle Speed Sensor Circuit (C1AA3)

    Yaw Rate Sensor Zero Point Malfunction (C1AA6)

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