| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001BKC5 |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for Gasoline Model): B163B,B163C; Side Airbag Sensor Assembly No.2 Lost Communication (LH); 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
DTC |
B163B |
Side Airbag Sensor Assembly No.2 Lost Communication (LH) |
|
DTC |
B163C |
Side Airbag Sensor Assembly No.2 Initialization Error (LH) |
DESCRIPTION
The side collision sensor LH circuit (bus 2) consists of the airbag ECU assembly and side No. 1 airbag sensor LH.
The side No. 1 airbag sensor LH detects impacts to the vehicle and sends 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 collision sensor LH circuit (bus 2).
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Test Mode / Check Mode |
|---|---|---|---|---|---|
|
B163B |
Side Airbag Sensor Assembly No.2 Lost Communication (LH) |
|
|
Comes on |
Does not apply to test/check mode |
|
B163C |
Side Airbag Sensor Assembly No.2 Initialization Error (LH) |
|
|
Comes on |
Does not apply to test/check mode |
WIRING DIAGRAM
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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![2019 - 2022 MY Avalon Avalon HV [04/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the engine switch off.
(b) 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.
(c) Check that the connectors are properly connected to the airbag ECU assembly and side No. 1 airbag sensor LH.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the airbag ECU assembly and side No. 1 airbag sensor LH.
(b) Check that the terminals of the connectors are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
| NG |
|
REPLACE FLOOR WIRE |
|
|
3. |
CHECK FLOOR WIRE |
|
(a) Connect the cable to the negative (-) battery terminal. |
|
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K33-2 (BFL+) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
K33-1 (BFL-) - Body ground |
Engine switch on (IG) |
Below 1 V |
(d) Turn the engine switch off.
(e) 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.
(f) Using a service wire, connect terminals 29 (BCL+) and 30 (BCL-) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K33-2 (BFL+) - K33-1 (BFL-) |
Always |
Below 1 Ω |
(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K33-2 (BFL+) - K33-1 (BFL-) |
Always |
1 MΩ or higher |
|
K33-2 (BFL+) - Body ground |
Always |
1 MΩ or higher |
|
K33-1 (BFL-) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
REPLACE FLOOR WIRE |
|
|
4. |
CHECK SIDE NO. 1 AIRBAG SENSOR LH |
|
(a) Connect the connector to the airbag ECU assembly. |
|
(b) Interchange the side No. 1 airbag sensor LH with RH and connect the connectors.
(c) Connect the cable to the negative (-) battery terminal.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory.
Body Electrical > SRS Airbag > Clear DTCs
(f) Turn the engine switch off.
(g) Turn the engine switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
HINT:
Codes other than DTCs B162B, B162C, B163B and B163C may be output at this time, but they are not related to this check.
|
Result |
Proceed to |
|---|---|
|
DTC B163B or B163C is output. |
A |
|
DTC B162B or B162C is output. |
B |
|
DTCs B162B, B162C, B163B and B163C are not output. |
C |
(i) Turn the engine switch off.
(j) 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.
(k) Return the side No. 1 airbag sensor LH and RH to their original positions and connect the connectors.
| A |
|
REPLACE AIRBAG ECU ASSEMBLY
|
| B |
|
REPLACE SIDE NO. 1 AIRBAG SENSOR LH
|
| C |
|
|
|