- The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the rear floor airbag sensor circuit for 2 seconds.
- A rear floor airbag sensor 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: RM0000038BD003X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1676/85 |
Lost Communication with Rear Floor Airbag Sensor RH |
|
DTC |
B1677/85 |
Rear Floor Airbag Sensor RH Initialization Incomplete |
|
DTC |
B1694/85 |
Side Satellite Sensor No. 2 Bus RH Initialization Incomplete |
DESCRIPTION
HINT:
"Rear floor airbag sensor RH" refers to the rear floor airbag sensor.
-
The rear floor airbag sensor circuit consists of the center airbag sensor and rear floor airbag sensor.
The rear floor airbag sensor detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1676/85, B1677/85 or B1694/85 is stored when a malfunction is detected in the rear floor airbag sensor circuit.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1676/85 |
When one of the following conditions is met: |
|
|
B1677/85 |
When one of the following conditions is met:
|
|
|
B1694/85 |
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 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 rear floor airbag sensor.
OK:
The connectors are properly connected.
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and rear floor airbag sensor.
(b) Check that the connectors (on the center airbag sensor side and rear floor airbag sensor side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
3. |
CHECK REAR FLOOR AIRBAG SENSOR 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 |
|---|---|---|
|
L19-2 (BER+) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
L19-1 (BER-) - 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 20 (BCR+) and 19 (BCR-) 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 |
|---|---|---|
|
L19-2 (BER+) - L19-1 (BER-) |
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 |
|---|---|---|
|
L19-2 (BER+) - L19-1 (BER-) |
Always |
1 MΩ or higher |
|
L19-2 (BER+) - Body ground |
Always |
1 MΩ or higher |
|
L19-1 (BER-) - Body ground |
Always |
1 MΩ or higher |
|
|
4. |
CHECK REAR FLOOR AIRBAG SENSOR |
(a) Connect the connectors to the center airbag sensor.
(b) Temporarily replace the rear floor airbag sensor with a new one.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory
.
(f) Turn the engine switch off.
(g) Turn the engine switch on (IG), and wait for at least 60 seconds.
(1) Check for DTCs
.
OK:
DTC B1676, B1677 and B1694 are not output.
HINT:
Codes other than DTC B1676, B1677 and B1694 may be output at this time, but they are not related to this check.
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