- The center airbag sensor receives an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the passenger airbag ON/OFF indicator circuit for 2 seconds.
- A passenger airbag ON/OFF indicator malfunction.
- A center airbag sensor malfunction.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001W2801WX |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1660/43 |
Passenger Airbag ON/OFF Indicator Circuit Malfunction |
DESCRIPTION
The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor and the passenger airbag ON/OFF indicator.
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag, front passenger side knee airbag, front seat side airbag RH and front seat outer belt RH.
DTC B1660/43 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1660/43 |
When one of the following conditions is met: |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
-
w/ Navigation system:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
-
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected
.
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
.
Result
|
Result |
Proceed to |
|---|---|
|
Always on |
A |
|
Off |
B |
|
|
2. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor and the multi-display or display and navigation module display.
OK:
The connectors are properly connected.
|
|
3. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and the multi-display or display and navigation module display.
(b) Check that the connectors (on the center airbag sensor side and multi-display side or display and navigation module display side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
4. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR |
(a) Connect the connector to the multi-display or display and navigation module display.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(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.
|
|
5. |
CHECK CENTER AIRBAG SENSOR |
(a) Connect the connector to the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the 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
.
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.
|
|
6. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the connector from the center airbag sensor and multi-display or display and navigation module display.
(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
F28-20 (AIR) - Body ground |
Engine switch on (IG) |
Below 1 V |
(f) Turn the engine switch off.
(g) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(h) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - F28-20 (AIR) |
Always |
Below 1 Ω |
(j) Disconnect the service wire from connector B.
(k) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - F28-20 (AIR) |
Always |
1 MΩ or higher |
|
F28-9 (ARON) - Body ground |
Always |
1 MΩ or higher |
|
F28-20 (AIR) - Body ground |
Always |
1 MΩ or higher |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (w/o Navigation System) |
B |
|
OK (w/ Navigation System) |
C |
|
|
7. |
CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE) |
(a) Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
FE4-13 (PAON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
FE4-12 (P-AB) - Body ground |
Engine switch on (IG) |
Below 1 V |
(d) Turn the engine switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
FE4-13 (PAON) - FE4-12 (P-AB) |
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 |
|---|---|---|
|
FE4-13 (PAON) - FE4-12 (P-AB) |
Always |
1 MΩ or higher |
|
FE4-13 (PAON) - Body ground |
Always |
1 MΩ or higher |
|
FE4-12 (P-AB) - Body ground |
Always |
1 MΩ or higher |
|
|
8. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor and the multi-display or display and navigation module display.
OK:
The connectors are properly connected.
|
|
9. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and the multi-display or display and navigation module display.
(b) Check that the connectors (on the center airbag sensor side and multi-display side or display and navigation module display side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
10. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT |
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
F28-20 (AIR) - Body ground |
Engine switch on (IG) |
Below 1 V |
(c) Turn the engine switch off.
(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(e) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - F28-20 (AIR) |
Always |
Below 1 Ω |
(g) Disconnect the service wire from connector B.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F28-9 (ARON) - F28-20 (AIR) |
Always |
1 MΩ or higher |
|
F28-9 (ARON) - Body ground |
Always |
1 MΩ or higher |
|
F28-20 (AIR) - Body ground |
Always |
1 MΩ or higher |
|
|
11. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE) |
(a) Turn the engine switch off.
(b) Connect the connectors to the center airbag sensor.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
F28-3 (IG) - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
|
12. |
CHECK PASSENGER AIRBAG ON/OFF INDICATOR |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Connect the connector to the multi-display or display and navigation module display.
(d) Disconnect the connectors from the center airbag sensor.
(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(f) Check the indicator according to the value(s) in the table below.
OK:
|
Tester Connection |
Switch Condition |
Passenger airbag ON/OFF indicator |
|---|---|---|
|
E47-23 (PAON) - Body ground |
Engine switch on (IG) |
"ON" comes on |
|
E47-17 (P-AB) - Body ground |
Engine switch on (IG) |
"OFF" comes on |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (w/ Navigation System) |
B |
|
NG (w/o Navigation System) |
C |
|
|
13. |
CHECK CENTER AIRBAG SENSOR |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Connect the connectors to the center airbag sensor.
(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Clear the 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
.
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.
|
|
14. |
CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE) |
(a) Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
FE4-13 (PAON) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
FE4-12 (P-AB) - Body ground |
Engine switch on (IG) |
Below 1 V |
(d) Turn the engine switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
FE4-13 (PAON) - FE4-12 (P-AB) |
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 |
|---|---|---|
|
FE4-13 (PAON) - FE4-12 (P-AB) |
Always |
1 MΩ or higher |
|
FE4-13 (PAON) - Body ground |
Always |
1 MΩ or higher |
|
FE4-12 (P-AB) - Body ground |
Always |
1 MΩ or higher |
|
|
|