SRS Warning Light does not Come ON [02/2019 - 08/2020]: Procedure

1. 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE OR RECHARGE AUXILIARY BATTERY 

Result: 

OK 

See step  2

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) auxiliary 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 (-) auxiliary 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 ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   W/O STOP AND START SYSTEM
   
   

   Tester Connection	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	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

4. 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

   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 (-) auxiliary battery terminal, and wait for at least 90 seconds.
2. Connect the connector to the combination meter assembly.
3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
4. 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.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022]