DESCRIPTION
The SRS warning light is located in the combination meter assembly.
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.
If a malfunction occurs in the airbag sensor assembly, combination meter assembly or wire harness connected to the airbag sensor assembly or combination meter assembly, the SRS warning light turns on.
When terminals TC and CG of the DLC3 are connected, DTCs are displayed by blinking of the SRS warning light.
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly 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 stored in the airbag sensor assembly. 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 airbag sensor assembly to the combination meter assembly via CAN communication.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK BATTERY VOLTAGE |
(a) Measure the voltage of the battery.
Standard Voltage:
11 to 14 V
NG |
INSPECT CHARGING SYSTEM AND BATTERY |
|
2. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Check that the connector is properly connected to the combination meter assembly.
OK:
The connector is properly connected.
HINT:
If the connector is not properly connected, reconnect the connector and proceed to the next inspection.
(d) Disconnect the connector from the combination meter assembly.
(e) Check that the terminals of the connector are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
NG |
REPAIR OR REPLACE CONNECTOR |
|
3. |
CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND) |
(a) Connect the cable to the negative (-) battery terminal. |
|
(b) Turn the ignition switch ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F4-39 (IG+) - Body ground |
Ignition switch ON |
11 to 14 V |
F4-40 (B) - Body ground |
Ignition switch off |
11 to 14 V |
(d) Turn the ignition switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F4-21 (ET) - Body ground |
Always |
Below 1 Ω |
NG |
REPAIR OR REPLACE WIRE HARNESS |
|
4. |
CHECK SRS WARNING LIGHT |
(a) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(b) Connect the connector to the combination meter assembly.
(c) Disconnect the connector from the airbag sensor assembly.
(d) Connect the cable to the negative (-) battery terminal.
(e) Turn the ignition switch ON and check the SRS warning light condition.
OK:
After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.
HINT:
The primary check period is approximately 6 seconds after the ignition switch is turned ON.
OK |
REPLACE AIRBAG SENSOR ASSEMBLY |
NG |
REPLACE COMBINATION METER ASSEMBLY |
Toyota CH-R Owners Manual > Do-it-yourself maintenance: Checking and replacing fuses
If any of the electrical components do not operate, a fuse may have
blown. If this happens, check and replace the fuses as necessary.
1. Turn the engine switch off.
2. Open the fuse box cover.
Engine compartment type A fuse box
While pushing the 2 claws, lift up the cover.
When closing the co ...
Toyota CH-R Service Manual > Airbag System: Short in Rear Side Squib LH Circuit (B1855/63-B1858/63)
DESCRIPTION
The rear side squib LH circuit consists of the airbag sensor assembly and rear
seat airbag LH.
The airbag sensor assembly uses this circuit to deploy the airbag when deployment
conditions are met.
These DTCs are stored when a malfunction is detected in the rear side squib LH
cir ...