Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Door Pressure Sensor RH Circuit Range/Performance (B166B,B166C,B166F)

DESCRIPTION

The side collision sensor RH circuit (bus 1) consists of the airbag ECU assembly, side airbag pressure sensor RH and side No. 2 airbag sensor RH.

The side airbag pressure sensor RH and side No. 2 airbag sensor RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the side airbag pressure sensor RH.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B166B

Front Door Pressure Sensor RH Circuit Range/Performance

  • Side airbag pressure sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Side airbag pressure sensor RH
  • Airbag ECU assembly

Comes on

Does not apply to test/check mode

B166C

Front Door Pressure Sensor RH

  • Side airbag pressure sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Side airbag pressure sensor RH
  • Airbag ECU assembly

Comes on

Does not apply to test/check mode

B166F

Front Door Pressure Sensor Threshold Malfunction (RH)

  • Side airbag pressure sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Side airbag pressure sensor RH
  • Airbag ECU assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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PROCEDURE

1.

CHECK SIDE AIRBAG PRESSURE SENSOR RH

(a) Turn the engine switch off.

*1

Side Airbag Pressure Sensor LH

*2

Side No. 2 Airbag Sensor RH

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminals to disable the SRS system.

(c) Interchange the side airbag pressure sensor RH with LH and connect the connectors.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the engine switch on (IG), and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

(h) Turn the engine switch on (IG), and wait for at least 60 seconds.

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B166B, B166C, B166F, B167A, B167E and B167F may be output at this time, but they are not related to this check.

Result

Proceed to

DTC B166B, B166C or B166F is output.

A

DTC B167A, B167E or B167F is output.

B

DTCs B166B, B166C, B166F, B167A, B167E and B167F are not output.

C

(j) Turn the engine switch off.

(k) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(l) Return the side airbag pressure sensor RH and LH to their original positions and connect the connectors.

A

REPLACE AIRBAG ECU ASSEMBLY

B

REPLACE SIDE AIRBAG PRESSURE SENSOR RH

C

USE SIMULATION METHOD TO CHECK

    Side Airbag Sensor Assembly No.2 Lost Communication (LH) (B163B,B163C)

    Lost Communication with Front Door Pressure Sensor RH (B166D,B166E)

    See More:

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