| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000YE2049X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
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 ignition switch is turned from OFF to ON, 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, the DTC is displayed by 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
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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Battery |
Always |
11 to 14 V |
|
|
3. |
CHECK CONNECTORS |
(a) Turn the ignition 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.
|
|
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 ignition switch to ON.
(d) Operate all 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 |
|---|---|---|
|
H56-21 (IG2) - H56-25 (E1) |
Ignition switch ON |
11 to 14 V |
|
H56-21 (IG2) - H56-26 (E2) |
Ignition switch ON |
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 connector from the combination meter.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Turn the ignition switch to ON.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H37-18 (B) - H37-40 (E1) |
Always |
11 to 14 V |
|
H37-20 (IG+) - H37-40 (E1) |
Ignition switch ON |
11 to 14 V |
|
|
6. |
CHECK SRS WARNING LIGHT |
(a) Turn the ignition 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 ignition switch to ON.
(f) Check the SRS warning light condition.
OK:
After the primary check period, SRS warning light goes off for approximately 10 seconds and remains on.
HINT:
The primary check period is approximately 6 seconds after the ignition switch is turned to ON.
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