SRS Warning Light Remains ON: Procedure

1. Check if a CAN communication DTC is output. Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2012 - ] .
   RESULT
   
   

   Result	Proceed to
   DTCs are output	A
   DTC is not output	B

A → See step   9 

B: Go to next step 

1. Measure the voltage of the auxiliary battery.

   Standard voltage

   11 to 14 V

NG → REPLACE OR RECHARGE AUXILIARY BATTERY 

OK: Go to next step 

1. Turn the power switch off.
2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the center airbag sensor assembly and combination meter assembly.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
3. Turn the power switch on (IG).
4. Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N52-21 (IG2) - N52-25 (E1)	Power switch on (IG)	11 to 14 V
   N52-21 (IG2) - N52-26 (E2)	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Center Airbag Sensor Assembly)

NG → REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the N40 connector from the combination meter assembly.
3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N40-21 (IG+) - N40-30 (ES)	Power switch on (IG)	11 to 14 V
   N40-22 (B) - N40-30 (ES)	Always	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, and wait for at least 90 seconds.
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.
   NOTE:

   Make sure that nobody is in the vehicle.

   OK

   After the primary check period, the SRS warning light goes off for approximately 10 seconds and then remains on.

   HINT: 

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

NG → See step   8 

OK → See step   7