- 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 front airbag sensor LH circuit for 2 seconds.
- A front airbag sensor LH 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: RM0000038AX003X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1608/84 |
Front Satellite Sensor Bus LH Initialization Incomplete |
|
DTC |
B1617/84 |
Lost Communication with Front Airbag Sensor LH |
|
DTC |
B1618/84 |
Front Airbag Sensor LH Initialization Incomplete |
DESCRIPTION
The front airbag sensor LH circuit consists of the center airbag sensor and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1608/84, B1617/84 or B1618/84 is stored when a malfunction is detected in the front airbag sensor LH circuit.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1608/84 |
When one of the following conditions is met: |
|
|
B1617/84 |
When one of the following conditions is met:
|
|
|
B1618/84 |
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 front airbag sensor LH.
OK:
The connectors are properly connected.
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and front airbag sensor LH.
(b) Check that the connectors (on the center airbag sensor side and front airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
3. |
CHECK FRONT AIRBAG SENSOR LH 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 |
|---|---|---|
|
A7-2 (+SL) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
A7-1 (-SL) - 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 30 (+SL) and 28 (-SL) 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 |
|---|---|---|
|
A7-2 (+SL) - A7-1 (-SL) |
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 |
|---|---|---|
|
A7-2 (+SL) - A7-1 (-SL) |
Always |
1 MΩ or higher |
|
A7-2 (+SL) - Body ground |
Always |
1 MΩ or higher |
|
A7-1 (-SL) - Body ground |
Always |
1 MΩ or higher |
|
|
4. |
CHECK FRONT AIRBAG SENSOR LH |
(a) Connect the connectors to the center airbag sensor.
(b) Interchange the front airbag sensor LH with RH and connect the connectors to them.
(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.
(h) Check for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1617 or B1618 is output |
A |
|
DTC B1612 or B1613 is output |
B |
|
DTC B1612, B1613, B1617 and B1618 are not output |
C |
HINT:
Codes other than DTC B1612, B1613, B1617 and B1618 may be output at this time, but they are not related to this check.
|
|
5. |
CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE) |
(a) Disconnect the instrument panel wire connector from the engine room main 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 |
|---|---|---|
|
AE1-2 (+SL) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
AE1-1 (-SL) - 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 30 (+SL) and 28 (-SL) 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 |
|---|---|---|
|
AE1-2 (+SL) - AE1-1 (-SL) |
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 |
|---|---|---|
|
AE1-2 (+SL) - AE1-1 (-SL) |
Always |
1 MΩ or higher |
|
AE1-2 (+SL) - Body ground |
Always |
1 MΩ or higher |
|
AE1-1 (-SL) - Body ground |
Always |
1 MΩ or higher |
|
|
|