Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001G4PV
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B166A; Pressure Sensor Difference for Front Door; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

B166A

Pressure Sensor Difference for Front Door

DESCRIPTION

The side airbag pressure sensor LH and side airbag pressure sensor RH detect impacts to the vehicle through changes in pressure inside the front doors caused by deformation of the outer side of the front doors and send signals to the airbag sensor assembly.

Based on the signals sent by the side airbag pressure sensors, the airbag sensor assembly determines if the airbags and pretensioners should be deployed.

If the difference between the pressure detected by the side airbag pressure sensor LH and the pressure detected by the side airbag pressure sensor RH exceeds a certain value a certain number of times, the airbag sensor assembly will store DTC B166A.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B166A

Pressure Sensor Difference for Front Door

The difference between the pressure detected by the side airbag pressure sensor LH and the side airbag pressure sensor RH exceeds a certain value a certain number of times.
  • Side airbag pressure sensor LH
  • Side airbag pressure sensor RH
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

CAUTION / NOTICE / HINT

NOTICE:

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

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PROCEDURE

1.

CHECK DTC

(a) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTCs B1633, B1642, B1643, B166D, B166E, B1638, B1647, B1648, B167B and B167C are not output.

HINT:

If DTC B1633, B1642, B1643, B166D, B166E, B1638, B1647, B1648, B167B or B167C is output, perform troubleshooting for the DTC first.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART 2021 MY Corolla Corolla HV [04/2020 - 06/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART 2022 MY Corolla Corolla HV [06/2021 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART

OK

2.

CHECK SIDE AIRBAG PRESSURE SENSOR LH

(a) Turn the power switch off.

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

CAUTION:

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

(c) Replace the side airbag pressure sensor LH with a known good one.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL

HINT:

Perform the following inspection using known good parts from another vehicle if possible.

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

(e) Turn the power 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 power switch off.

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

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B166A is not output.

HINT:

Codes other than DTC B166A may be output at this time, but they are not related to this check.

(j) Turn the power switch off.

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

CAUTION:

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

(l) Restore the side airbag pressure sensor LH that was installed for testing to its original location.

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OK

REPLACE SIDE AIRBAG PRESSURE SENSOR LH 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL

NG

3.

CHECK SIDE AIRBAG PRESSURE SENSOR RH

(a) Replace the side airbag pressure sensor RH with a known good one.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL

HINT:

Perform the following inspection using known good parts from another vehicle if possible.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

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

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the power switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B166A is not output.

HINT:

Codes other than DTC B166A may be output at this time, but they are not related to this check.

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

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

(j) Restore the side airbag pressure sensor RH that was installed for testing to its original location.

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OK

REPLACE SIDE AIRBAG PRESSURE SENSOR RH 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL

NG

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