| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001BKC9 |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for Gasoline Model): B1660; P Seat Airbag Active Mode Indicator; 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
DTC |
B1660 |
P Seat Airbag Active Mode Indicator |
DESCRIPTION
The passenger airbag ON/OFF indicator circuit consists of the airbag ECU assembly and passenger airbag ON/OFF indicator (radio and display receiver assembly).
The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag assembly and lower No. 2 instrument panel airbag assembly.
DTC B1660 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Test Mode / Check Mode |
|---|---|---|---|---|---|
|
B1660 |
P Seat Airbag Active Mode Indicator |
|
|
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)
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION |
(a) Turn the engine switch on (IG).
(b) Check the passenger airbag ON/OFF indicator operation.
HINT:
Refer to the normal condition of the passenger airbag ON/OFF indicator.
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|
Result |
Proceed to |
|---|---|
|
Passenger airbag ON/OFF indicator illumination is always on. |
A |
|
Passenger airbag ON/OFF indicator illumination is always off. |
B |
| B |
|
|
|
2. |
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, radio and display receiver assembly and instrument panel junction block assembly.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
3. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the airbag ECU assembly, radio and display receiver assembly and instrument panel junction block assembly.
(b) Check that the terminals of the connectors are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|
4. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION |
(a) Connect the connector to the radio and display receiver assembly and instrument panel junction block assembly.
(b) Connect the cable to the negative (-) battery terminal.
(c) Turn the engine switch on (IG).
(d) Check the passenger airbag ON/OFF indicator operation.
OK:
The passenger airbag ON/OFF indicator does not come on.
| NG |
|
|
|
5. |
CHECK DTC |
|
(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) Connect the connector to the airbag ECU assembly.
(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
OK:
DTC B1660 is not output.
HINT:
Codes other than DTC B1660 may be output at this time, but they are not related to this check.
| OK |
|
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY
|
|
6. |
CHECK WIRE HARNESS |
|
(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) Disconnect the connector from the radio and display receiver assembly.
(d) Connect the cable to the negative (-) battery terminal.
(e) Turn the engine switch on (IG).
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G20-9 (PAON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
G20-1 (P-AB) - Body ground |
Engine switch on (IG) |
Below 1 V |
(g) Turn the engine switch off.
(h) 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.
(i) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G20-9 (PAON) - G20-1 (P-AB) |
Always |
Below 1 Ω |
(k) Disconnect the service wire from connector B.
(l) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G20-9 (PAON) - G20-1 (P-AB) |
Always |
1 MΩ or higher |
|
G20-9 (PAON) - Body ground |
Always |
1 MΩ or higher |
|
G20-1 (P-AB) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
|
|
7. |
CHECK INSTRUMENT PANEL WIRE |
(a) Disconnect the connector from the instrument panel junction block assembly.
|
*1 |
Instrument Panel Junction Block Assembly |
*2 |
Airbag ECU Assembly |
|
*3 |
Radio and Display Receiver Assembly |
*4 |
Instrument Panel Wire |
|
*5 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
*b |
Front view of wire harness connector (to Airbag ECU Assembly) |
|
*c |
Front view of wire harness connector (to Radio and Display Receiver Assembly) |
- |
- |
(b) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-8 (PAON) - 4A-46 (P-AB) |
Always |
Below 1 Ω |
(d) Disconnect the service wire from connector B.
(e) Using a service wire, connect terminals 9 (PAON) and 1 (P-AB) of connector E.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-29 (PAON) - 4A-51 (P-AB) |
Always |
Below 1 Ω |
(g) Disconnect the service wire from connector E.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-8 (PAON) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-29 (PAON) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-46 (P-AB) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-51 (P-AB) - Body ground or other terminals |
Always |
1 MΩ or higher |
| OK |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
8. |
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, radio and display receiver assembly and instrument panel junction block assembly.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
9. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the airbag ECU assembly, radio and display receiver assembly and instrument panel junction block assembly.
(b) Check that the terminals of the connectors are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|
10. |
CHECK WIRE HARNESS |
|
(a) Connect the connector to the instrument panel junction block assembly. |
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Turn the engine switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G20-9 (PAON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
G20-1 (P-AB) - Body ground |
Engine switch on (IG) |
Below 1 V |
(e) Turn the engine switch off.
(f) 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.
(g) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) 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 |
|---|---|---|
|
G20-9 (PAON) - G20-1 (P-AB) |
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 |
|---|---|---|
|
G20-9 (PAON) - G20-1 (P-AB) |
Always |
1 MΩ or higher |
|
G20-9 (PAON) - Body ground |
Always |
1 MΩ or higher |
|
G20-1 (P-AB) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
11. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE) |
|
(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 |
|---|---|---|
|
G20-2 (IG+) - Body ground |
Engine switch on (IG) |
11 to 14 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.
| NG |
|
REPLACE WIRE HARNESS OR BATTERY |
|
|
12. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR |
|
(a) Connect the connector to the radio and display receiver assembly. |
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Turn the engine switch on (IG).
(d) Check the passenger airbag ON/OFF indicator according to the conditions in the table below.
OK:
|
Terminal Connection |
Condition |
Specified Condition |
|---|---|---|
|
G50-35 (PAON) - Body ground |
Engine switch on (IG) |
"ON" comes on |
|
G50-34 (P-AB) - Body ground |
Engine switch on (IG) |
"OFF" comes on |
(e) Turn the engine switch off.
(f) 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.
| NG |
|
|
|
13. |
CHECK DTC |
|
(a) Connect the connector to the airbag ECU assembly. |
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Turn the engine 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 engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
OK:
DTC B1660 is not output.
HINT:
Codes other than DTC B1660 may be output at this time, but they are not related to this check.
| OK |
|
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY
|
|
14. |
CHECK INSTRUMENT PANEL WIRE |
(a) Disconnect the connector from the instrument panel junction block assembly.
|
*1 |
Instrument Panel Junction Block Assembly |
*2 |
Airbag ECU Assembly |
|
*3 |
Radio and Display Receiver Assembly |
*4 |
Instrument Panel Wire |
|
*5 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
*b |
Front view of wire harness connector (to Airbag ECU Assembly) |
|
*c |
Front view of wire harness connector (to Radio and Display Receiver Assembly) |
- |
- |
(b) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-8 (PAON) - 4A-46 (P-AB) |
Always |
Below 1 Ω |
(d) Disconnect the service wire from connector B.
(e) Using a service wire, connect terminals 9 (PAON) and 1 (P-AB) of connector E.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-29 (PAON) - 4A-51 (P-AB) |
Always |
Below 1 Ω |
(g) Disconnect the service wire from connector E.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4A-8 (PAON) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-29 (PAON) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-46 (P-AB) - Body ground or other terminals |
Always |
1 MΩ or higher |
|
4A-51 (P-AB) - Body ground or other terminals |
Always |
1 MΩ or higher |
| OK |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|