SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B166A; Pressure Sensor Difference for Front Door; 2019 MY RAV4 RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001FQQA
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 02/2019]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B166A; Pressure Sensor Difference for Front Door; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

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 ECU assembly.

Based on the signals sent by the side airbag pressure sensor, the airbag ECU assembly determines if the SRS 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 ECU assembly will output 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 ECU assembly	Comes on	Not applicable

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal.
Click here
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
Click here
After replacing the airbag ECU assembly, refer to initialization.
Click here

PROCEDURE

CHECK DTC

(a) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK:

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

HINT:

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

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	CHECK SIDE AIRBAG PRESSURE SENSOR LH

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Click here

HINT:

Perform the following inspection using known good parts from another vehicle if possible.
When using a new part, since the side airbag pressure sensor LH and RH have the same part number, prepare either one.
A prepared side airbag pressure sensor can also be used for the side airbag pressure sensor RH inspection.

(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the ignition switch off.

(h) Turn the ignition switch to ON, and wait for at least 60 seconds.

(i) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

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

(j) Turn the ignition switch off.

(k) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

DTC B166A is not output

REPLACE SIDE AIRBAG PRESSURE SENSOR LH

DTC B166A is output

3.	CHECK SIDE AIRBAG PRESSURE SENSOR RH

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

Click here

HINT:

Perform the following inspection using known good parts from another vehicle if possible.
Use the door side airbag sensor that was prepared during the door side airbag sensor LH inspection.

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(d) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

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

(h) Turn the ignition switch off.

(i) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

DTC B166A is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B166A is not output

REPLACE SIDE AIRBAG PRESSURE SENSOR RH