SRS Warning Light does not Come ON: Procedure

1. Measure the voltage of the auxiliary battery.

   Standard Voltage

   11 to 14 V

NG → See step   6 

OK: Go to next step 

1. Turn the power switch off.
2. Disconnect the cable from the negative (-) auxiliary battery terminal.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Check that the connectors are properly connected to the airbag ECU assembly and the combination meter assembly.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Turn the power switch off.
   Fig 1: Measuring Voltage Of Combination Meter Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) auxiliary battery terminal.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Disconnect the connectors from the combination meter assembly and airbag ECU assembly.
4. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
5. Turn the power switch on (IG).
6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C1-1 (IG+) - C1-24 (ET)	Power switch on (IG)	11 to 14 V
   C1-2 (B) - C1-24 (ET)	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch off.
2. Disconnect the cable from the negative (-) auxiliary battery terminal.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Connect the connector to the combination meter assembly.
4. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
5. Turn the power switch on (IG).
6. Check the SRS warning light condition.

   OK

   The SRS warning light goes off after the primary check period and comes on again after approximately 10 seconds.

   HINT: 

   The primary check period lasts for approximately 6 seconds after the power switch is turned on (IG).

NG → See step   7 

OK → See step   5