Lexus ES manuals

Lexus ES: Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor (C1381)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hv Model) / Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor (C1381)

DESCRIPTION

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

If a power source malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly) is detected by the skid control ECU (brake booster with master cylinder assembly), DTC C1381 is stored.

DTC C1381 may be stored due to an intermittent low power source voltage.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1381

Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor

601

At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.
  • Wire harness or connector
  • Acceleration sensor (airbag ECU assembly)

Comes on
  • INF Code 601: SAE Code C14D7
  • ABS DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives valid or invalid information from the yaw rate and acceleration sensor (airbag ECU assembly) power supply voltage via CAN communication. When the vehicle is being driven and an invalid yaw rate and acceleration sensor (airbag ECU assembly) power supply voltage is received via CAN communication for a certain amount of time, the skid control ECU (brake booster with master cylinder assembly) judges that the power supply of the yaw rate and acceleration sensor (airbag ECU assembly) is abnormal and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C14D7: Acceleration sensor voltage circuit/open

Required Sensors/Components(Main)

Yaw rate and acceleration sensor (airbag ECU assembly)

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Speed sensor

Frequency of Operation

Continuous

Duration

10 seconds

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)

Not detected

IG1 voltage

Higher than 9.54 V

Vehicle speed

Higher than 3 km/h (2 mph)

TYPICAL MALFUNCTION THRESHOLDS

Yaw rate and acceleration sensor power supply voltage (IG) invalidation/validation (CAN communication data)

"1" (Invalid)

COMPONENT OPERATING RANGE

Both of the following conditions are met

-

Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)

Not detected

Yaw rate and acceleration sensor power supply voltage (IG) invalidation/validation (CAN communication data)

"0" (Valid)

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off.
  6. Turn the power switch on (READY).
  7. Turn the Techstream on.
  8. Drive the vehicle at a speed of 3 km/h (2 mph) or more for 10 seconds or more.
  9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
  10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
  11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))

(b) Disconnect the G64 yaw rate and acceleration sensor (airbag ECU assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the power switch on (IG).

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G64-36 (IG2) - Body ground

Power switch on (IG)

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)
OK

2.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the power switch off.

*a

Front view of wire harness connector

(to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G64-33 (E1) - Body ground

Always

Below 1 Ω

G64-32 (E2) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK

3.

RECONFIRM DTC

(a) Reconnect the G64 yaw rate and acceleration sensor (airbag ECU assembly) connector.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (READY).

(e) Perform a road test.

(f) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTC C1381 is not output.

A

DTC C1381 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG ECU ASSEMBLY

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