SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Vehicle Interior	Section: Supplemental Restraint Systems
Model Year: 2008	Model: LX570	Doc ID: RM000002NNA00JX
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570)

DTC

B1635/24

Rear Airbag Sensor LH Circuit Malfunction

DTC

B1637/82

Lost Communication with Rear Airbag Sensor LH

DTC

B1690/15

Door Side Airbag Sensor RH Malfunction

DTC

B1692/81

Lost Communication with Door Side Airbag Sensor RH

DESCRIPTION

HINT:

"Door side airbag sensor RH" refers to the side airbag sensor RH.

For DTC B1690 and B1635:
The rear airbag sensor LH and side airbag sensor RH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.

If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

DTC B1690/15 or B1635/24 is stored when a malfunction is detected in the rear airbag sensor LH or side airbag sensor RH circuit.
For DTC B1692 and B1637:
The circuit for the side collision sensor RH or LH (to determine deployment of the front seat side airbag RH or LH, rear seat side airbag RH or LH and curtain shield airbag RH or LH) is composed of the center airbag sensor, side airbag sensor RH or LH, and rear airbag sensor RH or LH.

The side airbag sensor RH or LH, and rear airbag sensor RH or LH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.

DTC B1692 or B1637 is stored when a malfunction is detected in the circuit for the side collision sensor RH or LH (to determine deployment of the front seat side airbag RH or LH, rear seat side airbag RH or LH, and curtain shield airbag RH or LH).

DTC Code	DTC Detection Condition	Trouble Area
B1635/24	When one of the following conditions is met: A side airbag sensor LH malfunction. A center airbag sensor malfunction.	Rear airbag sensor LH Center airbag sensor assembly
B1637/82	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to B+ signal in the circuit for the side collision sensor LH (to determine deployment of the front seat side airbag LH, rear seat side airbag LH and curtain shield airbag LH) for 2 seconds. A side airbag sensor LH malfunction. A center airbag sensor malfunction.	Rear airbag sensor LH Center airbag sensor assembly
B1690/15	When one of the following conditions is met: A side airbag sensor RH malfunction. A center airbag sensor malfunction.	Side airbag sensor RH Center airbag sensor assembly
B1692/81	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to B+ signal in the circuit for the side collision sensor RH (to determine deployment of the front seat side airbag RH, rear seat side airbag RH and curtain shield airbag RH) for 2 seconds. A side airbag sensor RH malfunction. A center airbag sensor malfunction.	Side airbag sensor RH Center airbag sensor assembly

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 stored in the memory .

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG), and wait for at least 60 seconds.

(e) Check for DTCs .

Result:

Result	Proceed to
DTC B1635, B1637, B1690 and B1692 are not output	A
DTC B1635 or B1637 is output	B
DTC B1690 or B1692 is output	C

HINT:

Codes other than DTC B1635, B1637, B1690 and B1692 may be output at this time, but they are not related to this check.

C

2.	CHECK SIDE AIRBAG SENSOR RH

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Interchange the side airbag sensor RH with LH and connect the connectors to them.

(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 stored in the memory .

(g) Turn the engine switch off.

(h) Turn the engine switch on (IG), and wait for at least 60 seconds.

(i) Check for DTCs .

Result:

Result	Proceed to
DTC B1695, B1697, B1690 and B1692 are not output	A
DTC B1695 or B1697 is output	B
DTC B1690 or B1692 is output	C

HINT:

Codes other than DTC B1690, B1692, B1695 and B1697 may be output at this time, but they are not related to this check.

(j) Turn the engine switch off.

(k) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(l) Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

C

3.	CHECK REAR AIRBAG SENSOR LH

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Temporarily replace the rear airbag sensor LH with a new one.

(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 stored in the memory .

(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 B1635 and B1637 are not output.

HINT:

Codes other than DTC B1635 and B1637 may be output at this time, but they are not related to this check.

OK