SRS Warning Light does not Come ON [03/2017 - 05/2023]: Procedure

1. Measure the battery voltage.

   Standard voltage

   11 to 14 V

   HINT: 

   It may be possible to tell whether the battery is discharged by operating the horn.

   If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE OR RECHARGE BATTERY 

Result: 

OK 

See step  2

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 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.

4. Disconnect the connector from the combination meter assembly.
5. Check that the terminals of the connector are not deformed or damaged.

   OK

   The terminals are not deformed or damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CONNECTOR 

Result: 

OK 

See step  3

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Combination Meter Assembly)

2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   P25-21 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V
   P25-22 (B) - Body ground	Engine switch off	11 to 14 V

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P25-31 (ES) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
2. Connect the connector to the combination meter assembly.
3. Disconnect the connector from the airbag ECU assembly.
4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. Turn the engine 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 engine switch is turned on (IG).

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [03/2017 - ]