| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AR8Q |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1653; Driver Side Seat Position Sensor; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
|
DTC |
B1653 |
Driver Side Seat Position Sensor |
DESCRIPTION
The seat position airbag sensor circuit consists of the airbag ECU assembly and seat position airbag sensor.
DTC B1653 is stored when a malfunction is detected in the seat position airbag sensor circuit.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Test Mode / Check Mode |
|---|---|---|---|---|---|
|
B1653 |
Driver Side Seat Position Sensor |
|
|
Comes on |
Does not apply to test/check mode |
WIRING DIAGRAM
w/o Seat Position Memory System:
w/ Seat Position Memory System:
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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![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 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) Check that the connectors are properly connected to the airbag ECU assembly, front seat inner belt assembly LH and seat position airbag sensor.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the airbag ECU assembly, front seat inner belt assembly LH and seat position airbag sensor.
(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 OR FRONT SEAT INNER BELT ASSEMBLY LH |
|
|
3. |
CHECK WIRE HARNESS |
|
(a) Connect the connectors to the front seat inner belt assembly LH and floor wire. |
|
(b) Connect the cable to the negative (-) auxiliary battery terminal.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z12-2 (LSP+) - Body ground |
Power switch on (IG) |
Below 1 V |
|
z12-1 (LSP-) - Body ground |
Power switch on (IG) |
Below 1 V |
(e) Turn the power switch off.
(f) 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.
(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z12-2 (LSP+) - z12-1 (LSP-) |
Always |
Below 1 Ω |
(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z12-2 (LSP+) - z12-1 (LSP-) |
Always |
1 MΩ or higher |
|
z12-2 (LSP+) - Body ground |
Always |
1 MΩ or higher |
|
z12-1 (LSP-) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
4. |
CHECK DTC |
|
(a) Connect the connectors to the airbag ECU assembly and seat position airbag sensor. |
|
(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 B1653 is not output.
HINT:
Codes other than DTC B1653 may be output at this time, but they are not related to this check.
| OK |
|
|
|
5. |
CHECK SEAT POSITION AIRBAG SENSOR |
|
(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 seat position airbag sensor with a known good one.
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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 B1653 is not output.
HINT:
Codes other than DTC B1653 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 seat position airbag sensor that was installed for testing to its original location.
Click here
| OK |
|
REPLACE SEAT POSITION AIRBAG SENSOR
|
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY
|
|
6. |
CHECK FLOOR WIRE |
(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
|
*A |
w/o Seat Position Memory System |
*B |
w/ Seat Position Memory System |
|
*1 |
Seat Position Airbag Sensor |
*2 |
Front Seat Inner Belt Assembly LH |
|
*3 |
Airbag ECU Assembly |
*4 |
Floor Wire |
|
*5 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Airbag ECU Assembly) |
*b |
Front view of wire harness connector (to Front Seat Inner Belt Assembly LH) |
(b) Connect the cable to the negative (-) auxiliary battery terminal.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
w/o Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K53-4 (LSP+) - Body ground |
Power switch on (IG) |
Below 1 V |
|
K53-3 (LSP-) - Body ground |
Power switch on (IG) |
Below 1 V |
w/ Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K54-3 (LSP+) - Body ground |
Power switch on (IG) |
Below 1 V |
|
K54-4 (LSP-) - Body ground |
Power switch on (IG) |
Below 1 V |
(e) Turn the power switch off.
(f) 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.
(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/o Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K53-4 (LSP+) - K53-3 (LSP-) |
Always |
Below 1 Ω |
w/ Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K54-3 (LSP+) - K54-4 (LSP-) |
Always |
Below 1 Ω |
(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/o Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K53-4 (LSP+) - K53-3 (LSP-) |
Always |
1 MΩ or higher |
|
K53-4 (LSP+) - Body ground |
Always |
1 MΩ or higher |
|
K53-3 (LSP-) - Body ground |
Always |
1 MΩ or higher |
w/ Seat Position Memory System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K54-3 (LSP+) - K54-4 (LSP-) |
Always |
1 MΩ or higher |
|
K54-3 (LSP+) - Body ground |
Always |
1 MΩ or higher |
|
K54-4 (LSP-) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
|
| NG |
|
REPLACE FLOOR WIRE |
|
|