| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001QM5Z |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - 10/2022] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SRS Warning Light does not Come ON; 2021 - 2022 MY RAV4 RAV4 HV [08/2020 - 10/2022] | ||
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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 ignition switch is turned from off 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, 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 airbag ECU assembly in case the 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 recorded in the airbag ECU 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 ECU assembly to the combination meter assembly through the CAN communication system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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![2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION](/t3Portal/stylegraphics/info.gif)
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When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
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After replacing the airbag ECU assembly, refer to initialization.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
- When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
PROCEDURE
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1. |
CHECK AUXILIARY BATTERY |
(a) Measure the auxiliary battery voltage with the ignition switch off.
Standard voltage:
11 to 14 V
HINT:
It may be possible to tell whether the auxiliary battery is discharged by operating the horn.
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
| NG |
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REPLACE OR RECHARGE AUXILIARY BATTERY |
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2. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(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 |
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REPAIR OR REPLACE CONNECTOR |
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3. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND) |
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(a) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds. |
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(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
w/o Stop and Start System
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
G18-38 (IG+) - Body ground |
Ignition switch ON |
11 to 14 V |
|
G18-22 (B) - Body ground |
Ignition switch OFF |
11 to 14 V |
w/ Stop and Start System
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
G18-38 (IG+) - Body ground |
Ignition switch ON |
10.5 to 16 V |
|
G18-22 (B) - Body ground |
Ignition switch OFF |
11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G18-23 (ES) - Body ground |
Always |
Below 1 Ω |
| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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4. |
CHECK SRS WARNING LIGHT |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(b) Connect the connector to the combination meter assembly.
(c) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
(d) Turn the ignition switch to 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 to ON.
| OK |
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REPLACE AIRBAG ECU ASSEMBLY
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| NG |
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