| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000YE2046X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
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SRS Warning Light Remains ON |
DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the engine switch is turned from off to on (IG), and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, DTCs are output by the blinking of the SRS warning light.
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the center airbag sensor in case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage.
A malfunction in this circuit is not recorded in the center airbag sensor. The SRS warning light automatically goes off when the source voltage returns to normal.
The signal to illuminate the SRS warning light is transmitted from the center airbag sensor to the combination meter through the CAN communication system.
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 CAN COMMUNICATION SYSTEM |
(a) Check if a CAN communication DTC is output
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is not output |
A |
|
DTCs are output |
B |
|
|
2. |
CHECK BATTERY |
(a) Measure the voltage of the battery.
Standard voltage:
11 to 14 V
|
|
3. |
CHECK 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 combination meter.
OK:
The connectors are properly connected.
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|
4. |
CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR) |
(a) Disconnect the connectors from 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).
(d) Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
E47-21 (IG2) - E47-25 (E1) |
Engine switch on (IG) |
11 to 14 V |
|
E47-21 (IG2) - E47-26 (E2) |
Engine switch on (IG) |
11 to 14 V |
|
|
5. |
CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER) |
(a) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(b) Disconnect the E77 connector from the combination meter.
(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 |
|---|---|---|
|
E77-30 (IG+) - E77-26 (ET) |
Engine switch on (IG) |
11 to 14 V |
|
E77-21 (B) - E77-26 (ET) |
Always |
11 to 14 V |
|
|
6. |
CHECK SRS WARNING LIGHT (SHORT TO GROUND) |
(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 combination meter.
(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(e) Turn the engine switch on (IG).
(f) Check the SRS warning light condition.
NOTICE:
Make sure that nobody is in the vehicle.
OK:
After the primary check period, the SRS warning light goes off for approximately 10 seconds and then remains on.
HINT:
The primary check period is approximately 6 seconds after the engine switch is turned on (IG).
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