| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001G4QF |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): SRS Warning Light does not Come ON; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
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SRS Warning Light does not Come ON |
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 power switch is turned from off to on (IG), and then turns 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.
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in case the power source voltage drops.
When the auxiliary 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 turns off when the power 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:
-
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
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1. |
CHECK AUXILIARY BATTERY VOLTAGE |
(a) Measure the voltage of the auxiliary battery with the power switch off.
Standard Voltage:
11 to 14 V
| NG |
|
|
|
2. |
CHECK CONNECTOR |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 (-) auxiliary battery terminal. |
|
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I4-38 (IG+) - Body ground |
Power switch on (IG) |
11 to 14 V |
|
I4-22 (B) - Body ground |
Power switch off |
11 to 14 V |
(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I4-23 (ES) - Body ground |
Always |
Below 1 Ω |
|
I4-19 (EP) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE WIRE HARNESS |
|
|
4. |
CHECK SRS WARNING LIGHT |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 (-) auxiliary battery terminal.
(e) Turn the power switch on (IG) 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 power switch is turned on (IG).
| OK |
|
REPLACE AIRBAG SENSOR ASSEMBLY
|
| NG |
|
REPLACE COMBINATION METER ASSEMBLY
|
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