SRS Warning Light Remains ON [10/2014 - 10/2015]: Procedure

1. Check the SRS warning light operation approximately 6 seconds after the engine switch is turned on (IG).

   Result

   SRS Warning Light Illumination	Proceed to
   Remains on	A
   Goes off and then comes on again	B

Result: 

B 

See step  6

Result: 

A 

See step  2

1. Measure the voltage of the battery.

   Standard Voltage

   11 to 14 V

Result: 

NG 

INSPECT CHARGING SYSTEM AND BATTERY 

(Refer to ON-VEHICLE INSPECTION [10/2014 - ] )

Result: 

OK 

See step  3

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

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

3. Check that the connector is properly connected to the airbag ECU 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 D36 airbag ECU assembly connector.
5. Check that the terminals of the connector are not damaged.

   OK

   The terminals are not deformed or damaged.

Result: 

NG 

REPLACE WIRE HARNESS 

Result: 

OK 

See step  4

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Airbag ECU Assembly)

2. Turn the engine switch on (IG).
3. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D36-21 (IG2) - Body ground	Engine switch on (IG)	8 to 16 V

5. Turn the engine switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D36-25 (E1) - Body ground	Always	Below 1 Ω
   D36-26 (E2) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPLACE WIRE HARNESS 

Result: 

OK 

See step  5

1. Turn the engine switch on (IG).
2. Check the SRS warning light condition.

   OK

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

   HINT: 

   The primary check operates for approximately 6 seconds after the engine switch is turned on (IG).

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

1. Using the Techstream, check if the CAN communication system is functioning normally.

   HINT: 

   • Refer to CAN Bus Check for the CAN communication system (Refer to DIAGNOSIS SYSTEM [10/2014 - 10/2015] ).
   • The airbag ECU assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

   Result

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

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result: 

A 

See step  7

1. Measure the voltage of the battery.

   Standard Voltage

   11 to 14 V

Result: 

NG 

INSPECT CHARGING SYSTEM AND BATTERY 

(Refer to ON-VEHICLE INSPECTION [10/2014 - ] )

Result: 

OK 

See step  8

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

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

3. Check that the connector is properly connected to the airbag ECU 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 D36 airbag ECU assembly connector.
5. Check that the terminals of the connector are not damaged.

   OK

   The terminals are not deformed or damaged.

Result: 

NG 

REPLACE WIRE HARNESS 

Result: 

OK 

See step  9

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Airbag ECU Assembly)

2. Turn the engine switch on (IG).
3. Operate all components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D36-21 (IG2) - Body ground	Engine switch on (IG)	8 to 16 V

5. Turn the engine switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D36-25 (E1) - Body ground	Always	Below 1 Ω
   D36-26 (E2) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPLACE WIRE HARNESS 

Result: 

OK 

See step  10

1. Disconnect the cable from the negative (-) battery terminal.
   WARNING:

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

2. 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.

3. Disconnect the D9 combination meter assembly connector.
4. Check that the terminals of the connector are not damaged.

   OK

   The terminals are not deformed or damaged.

Result: 

NG 

REPAIR OR REPLACE CONNECTOR 

Result: 

OK 

See step  11

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *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	Condition	Specified Condition
   D9-13 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V
   D9-1 (B) - Body ground	Always	11 to 14 V

4. Turn the engine switch off.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D9-7 (ES) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE WIRE HARNESS 

Result: 

OK 

See step  12

1. Disconnect the cable from the negative (-) battery terminal.
   WARNING:

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

2. Reconnect the D9 combination meter assembly connector.
3. Connect the cable to the negative (-) battery terminal.
4. Turn the engine switch on (IG).
5. Check the SRS warning light condition.

   OK

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

   HINT: 

   The primary check operates for approximately 6 seconds after the engine switch is turned on (IG).

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )