SRS Warning Light does not Come ON [06/2020 - 10/2022]: 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 60 seconds.
3. Check that the connector is properly connected to the combination meter assembly.

   Result

   Proceed to
   The connectors are properly connected
   The connectors are not properly connected

Result: 

The connectors are not properly connected 

CONNECT CONNECTORS PROPERLY 

Result: 

The connectors are properly connected 

See step  3

1. Disconnect the combination meter connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Combination Meter
   *2	Airbag ECU Assembly
   *3	Wire Harness

2. Check that the connectors (on the combination meter side) are not damaged.

   Result

   Proceed to
   The connectors are not deformed or damaged
   The connectors are deformed or damaged

Result: 

The connectors are deformed or damaged 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

The connectors are not deformed or damaged 

See step  4

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

   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

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  5

1. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
2. Connect the G18 combination meter assembly connector.
3. Disconnect the G70 airbag ECU assembly connector.
4. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
5. Turn the ignition switch to ON.
6. Approximately 6 seconds after the ignition switch is turned to ON, check the condition of the SRS warning light.

   Result

   Proceed to
   Turns off for 10 seconds, and then illuminates
   Turns off for 10 seconds, and then remains off

Result: 

Turns off for 10 seconds, and then illuminates 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [06/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022] 

Result: 

Turns off for 10 seconds, and then remains off 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022]