- 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 seat position sensor circuit for 2 seconds.
- A seat position 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: RM000000YTS038X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1653/35 |
Seat Position Airbag Sensor Circuit Malfunction |
DESCRIPTION
The seat position sensor circuit consists of the center airbag sensor and the seat position sensor.
DTC B1653/35 is stored when a malfunction is detected in the seat position sensor circuit.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1653/35 |
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 FOR DTC |
(a) Turn the engine switch on (IG).
(b) Clear the DTCs
.
(c) Turn the engine switch off.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Check for DTCs
.
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.
|
|
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 seat position sensor.
OK:
The connectors are properly connected.
|
|
3. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and the seat position sensor.
(b) Check that the connectors (on the center airbag sensor side and seat position sensor side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
4. |
CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SEAT POSITION AIRBAG SENSOR) |
(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 |
|---|---|---|
|
K10-4 (LSP+) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
K10-8 (LSP-) - 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) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K10-4 (LSP+) - K27-9 (LSP+) |
Always |
Below 1 Ω |
|
K10-4 (LSP+) - Body ground |
Always |
1 MΩ or higher |
|
K10-8 (LSP-) - Body ground |
Always |
Below 1 Ω |
|
|
5. |
CHECK SEAT POSITION SENSOR |
(a) Connect the connectors to the center airbag sensor and the seat position 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 stored in the memory
.
(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 B1653 is not output.
HINT:
Codes other than DTC B1653 may be output at this time, but they are not related to this check.
|
|
6. |
REPLACE SEAT POSITION SENSOR |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Replace the seat position sensor
.
HINT:
Perform the inspection using parts from a normally functioning vehicle if possible.
|
|
7. |
CHECK CENTER AIRBAG SENSOR |
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Turn the engine switch on (IG), and wait for at least 60 seconds.
(c) Clear the DTCs
.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Check for DTCs
.
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.
|
|
|