SUPPLEMENTAL RESTRAINT SYSTEMS  AIRBAG SYSTEM  DIAGNOSIS SYSTEM  


CHECK DLC3


a.

Check the DLC3.

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>GENERAL INFORMATION



FUNCTION OF SRS WARNING LIGHT


a.

Primary check

i.

Turn the ignition switch off. Wait for at least 2 seconds, then turn the ignition switch to ON. The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system (including the seat belt pretensioner) is performed.

HINT:

If malfunctions are detected during the primary check, the SRS warning light remains on even after the primary check period of approximately 6 seconds.




b.

Constant check

i.

After the primary check, the airbag ECU assembly constantly monitors the airbag system for malfunctions.

HINT:
If malfunctions are detected during the constant check, the airbag ECU assembly will indicate the malfunction as follows:
·

The SRS warning light comes on.

·

The SRS warning light goes off, and then comes on. This indicates a source voltage drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.





c.

Review

i.

When the airbag system is normal:

The SRS warning light comes on only during the primary check period of approximately 6 seconds after the ignition switch is turned to ON.


ii.

When the airbag system is malfunctioning:

·

The SRS warning light remains on even after the primary check period.

·

The SRS warning light goes off after the primary check, but comes on again during the constant check.

·

The SRS warning light does not come on when the ignition switch is turned from off to ON.


HINT:

The airbag ECU assembly keeps the SRS warning light on if the airbag and pretensioner have been deployed.





SRS WARNING LIGHT CHECK


a.
C265591

Turn the ignition switch to ON, and check that the SRS warning light comes on for approximately 6 seconds (primary check).


b.

Check that the SRS warning light goes off approximately 6 seconds after the ignition switch is turned to ON (constant check).

HINT:

When any of the following symptoms occur, refer to Problem Symptoms Table.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM>PROBLEM SYMPTOMS TABLE

·

The SRS warning light comes on occasionally after the primary check period.

·

The SRS warning light comes on, but DTCs are not output.

·

The ignition switch is turned from off to ON, but the SRS warning light does not come on.





FUNCTION OF SRS CONNECTORS


a.

The SRS connectors are located as shown in the illustration.

C302849
5.385,0.552 6.854,1.031 1.469,0.479 10 false Airbag ECU Assembly 5.521,1.031 6.021,1.552 0.5,0.521 10 false 1 5.521,1.333 6.021,1.854 0.5,0.521 10 false 2 6.552,1.031 7.052,1.552 0.5,0.521 10 false 3 6.552,1.333 7.052,1.854 0.5,0.521 10 false 4 6.073,1.188 6.573,1.708 0.5,0.521 10 false A 0.635,1.448 2.667,1.906 2.031,0.458 10 false SRS Warning Light (Combination Meter Assembly) 3.167,1.302 3.615,1.729 0.448,0.427 10 false 15 3.438,1.771 3.885,2.198 0.448,0.427 10 false 16 0.906,2.542 2.375,3.031 1.469,0.49 10 false Front Airbag Sensor LH 0.365,4.094 1.813,4.615 1.448,0.521 10 false Driver Side Squib (Horn Button Assembly) 2.76,4.313 4.521,4.792 1.76,0.479 10 false Spiral Cable Sub-assembly 2.073,3.958 2.625,4.302 0.552,0.344 10 false 7 2.323,4.427 2.875,4.771 0.552,0.344 10 false 8 4.563,3.958 5.115,4.302 0.552,0.344 10 false 5 4.813,4.427 5.365,4.771 0.552,0.344 10 false 6 0.938,3.438 2.406,3.927 1.469,0.49 10 false Front Airbag Sensor RH 4.198,3.333 4.75,3.677 0.552,0.344 10 false 9 4.521,3.333 5.073,3.677 0.552,0.344 10 false 10 3.167,3.063 3.719,3.406 0.552,0.344 10 false 11 3.427,3.531 3.979,3.875 0.552,0.344 10 false 12 4.521,2.458 5.073,2.802 0.552,0.344 10 false 10 4.198,2.458 4.75,2.802 0.552,0.344 10 false 9 3.167,2.177 3.719,2.521 0.552,0.344 10 false 11 3.427,2.667 3.979,3.01 0.552,0.344 10 false 12 0.396,4.99 2.885,5.479 2.49,0.49 10 false Front Pretensioner Squib RH (Front Seat Outer Belt Assembly RH) 3.167,4.844 3.719,5.188 0.552,0.344 10 false 13 3.427,5.333 3.979,5.677 0.552,0.344 10 false 14

Connector Type Application
Terminal Twin-lock Mechanism Connectors 2, 4, 6, 10, 16
Half Connection Prevention Mechanism Connector 6
Activation Prevention Mechanism Connectors 2, 4, 5, 7, 13
Connector Lock Mechanism (1) Connectors 8, 14
Connector Position Assurance Mechanism Connectors 9, 12
Connector Lock Mechanism (2) Connector A
Improper Connection Prevention Lock Mechanism Connector A


b.

Terminal twin-lock mechanism

C190972E05
2.438,0.094 2.052,0.094 false 2.813,0.656 2.438,0.094 false 5.708,0.094 5.573,0.094 false 5.854,0.635 5.708,0.094 false 0.729,0.01 2.083,0.188 1.354,0.177 10 Lance (Primary Lock) 1.229,1.448 2.167,1.625 0.938,0.177 10 Primary Lock 4.021,0.01 5.698,0.188 1.677,0.177 10 Spacer (Secondary Lock) 4.896,1.427 5.948,1.604 1.052,0.177 10 Secondary Lock

i.

This mechanism is designed to increase the ability of the terminal to remain connected and prevent it from accidentally being disconnected.


ii.

The connector has a two-piece construction consisting of the housing and spacer to securely lock the terminal using both the lance (primary lock) and spacer (secondary lock).



c.

Half connection prevention mechanism

C147461E14
1.427,1.083 1.271,1.083 false 1.531,1.417 1.427,1.083 false 1.719,0.813 1.5,0.813 false 1.833,1.375 1.719,0.813 false 2.146,0.531 1.938,0.531 false 2.354,1.333 2.146,0.531 false 3.219,0.563 3.406,0.563 false 3.01,1.208 3.219,0.563 false 3.458,0.865 3.635,0.865 false 3.198,1.313 3.458,0.865 false 5.917,0.74 5.729,0.74 false 6.063,1.156 5.917,0.74 false 1.125,0.458 1.958,0.667 0.833,0.208 10 Locking Arm 0.979,0.729 1.531,0.927 0.552,0.198 10 Stopper 0.469,1 1.323,1.25 0.854,0.25 10 Locking Part 3.448,0.5 3.885,0.688 0.438,0.188 10 Slider 3.667,0.802 4.135,0.99 0.469,0.188 10 Spring 5.177,0.646 5.76,0.833 0.583,0.188 10 Stopper 4.615,1.969 6.01,2.344 1.396,0.375 10 Rebounded by Slider

i.

This mechanism is designed to prevent the connector from being connected only halfway.


ii.

If the connector is not completely connected, the connector is disconnected due to the spring force so that no continuity exists.



d.

Activation prevention mechanism

C238382E02
1.583,1.063 1.198,0.917 false 5.26,1.521 5.26,2.042 false 1.844,1.667 1.844,2.083 false 1.656,1.448 1.198,1.448 false 2.646,1.646 2.969,1.646 false 2.354,1.385 3,0.969 3,0.969 2.552,1.458 false 1.771,0.375 2.51,0.708 0.74,0.333 10 When open 0.313,0.833 1.208,1.146 0.896,0.313 10 Male Housing 3.042,0.885 4.115,1.229 1.073,0.344 10 Female Terminal 0.302,1.375 1.198,1.698 0.896,0.323 10 Male Terminal 3.01,1.573 4.073,1.938 1.063,0.365 10 Female Housing 1.26,2.104 2.448,2.448 1.188,0.344 10 Short Spring Plate 5.448,0.375 6.354,0.75 0.906,0.375 10 When shorted 4.375,2.063 6.156,2.635 1.781,0.573 10 Short spring plate contacting the male terminal

i.

This mechanism is designed to create a short circuit automatically between the positive and negative terminals of an airbag power source connector when disconnected.


ii.

The short spring plate contained in the connector creates a closed circuit on the airbag side (no potential difference can occur between both terminals), preventing accidental airbag deployment when servicing.



e.

Connector lock mechanism (1)

C147462E03
2.521,0.344 2.021,0.198 false 2.635,0.76 2.281,0.885 false 2.469,1.24 2.271,1.323 false 4.927,0.896 5.24,0.688 false 0.531,0.115 2.01,0.292 1.479,0.177 10 Lock the locking button 1.927,0.813 2.302,0.979 0.375,0.167 10 Claw 1.792,1.25 2.281,1.417 0.49,0.167 10 Groove 5.281,0.604 6.927,1.031 1.646,0.427 10 Claw on the locking button is locked in the groove

i.

This mechanism is designed to prevent the connector from accidentally being disconnected.


ii.

Locking the connector locking button engages the locking button claws in the grooves on the other side of the connector to connect the connector securely.



f.

Connector Position Assurance (CPA) mechanism

C161464E04
0.854,0.198 1.021,0.198 false 0.833,1.104 0.854,0.198 false 1.052,0.479 1.219,0.479 false 0.927,1.25 1.052,0.479 false 0.729,2.292 0.958,2.292 false 0.51,1.792 0.729,2.292 false 5.635,0.781 5.469,0.781 false 5.646,1.156 5.635,0.781 false 1.063,0.125 2.271,0.354 1.208,0.229 10 Female Connector 1.26,0.406 2.094,0.656 0.833,0.25 10 Locking Part 1.0,2.219 2.042,2.469 1.042,0.25 10 Male Connector 2.958,0.302 4.542,0.573 1.583,0.271 10 Primary Lock Completed 5.073,0.302 6.844,0.573 1.771,0.271 10 Secondary Lock Completed 4.896,0.698 5.521,0.875 0.625,0.177 10 Retainer

i.

This mechanism is designed to detect when the connector is connected only halfway.


ii.

The CPA and female connector slide to the male connector side at the same time and the primary lock is completed when the female connector is engaged with the male connector. From this point, only the CPA slides to the male connector side and secondary lock is completed when the CPA retainer is engaged with the female connector. When the CPA and female connector ends are aligned, they are completely engaged.



g.

Connector lock mechanism (2)

C302021E01
0.552,1.802 0.802,1.802 0.802,1.802 1.031,1.51 false 5.896,2.698 5.979,2.365 5.979,2.365 6.146,2.365 false 3.302,1.021 3.302,0.521 3.302,0.521 3.552,0.521 false 5.281,2.74 5.781,2.74 false 5.25,3.146 5.5,3.146 5.5,3.146 5.656,3.302 false 3.917,3.313 3.917,2.813 false 0.833,3.5 1.25,3.5 1.25,3.5 1.688,3.219 false 0.156,1.719 0.927,1.917 0.771,0.198 10 false Lance 3.604,0.438 4.375,0.635 0.771,0.198 10 false Holder 6.188,2.292 6.958,2.49 0.771,0.198 10 false Claw 4.844,2.646 5.573,2.896 0.729,0.25 10 false Holder 4.708,3.063 5.479,3.26 0.771,0.198 10 false Retainer 3.667,3.333 4.417,3.563 0.75,0.229 10 false Retainer 0.292,3.406 1.042,3.635 0.75,0.229 10 false Retainer

i.

This mechanism is designed to prevent the connector from accidentally being disconnected.


ii.

Sliding the connector all the way into the holder and locking the lance completes the primary lock.


iii.

Engaging the retainer to the holder as shown in the illustration completes the secondary lock, preventing the connector from accidentally being disconnected.



h.

Improper connection prevention lock mechanism

C302022E01
4.083,3.281 4.365,3.281 false 5.01,0.854 5.26,0.521 5.26,0.521 5.427,0.521 false 4.719,0.667 4.719,0.167 4.719,0.167 4.969,0.167 false 4.313,1.458 4.51,1.458 4.51,1.458 4.76,1.042 false 1.417,1.125 1.417,0.542 1.417,0.542 1.667,0.542 false 0.99,2.948 1.406,2.948 1.406,2.948 1.406,1.531 false 3.5,0.063 4.5,0.427 1,0.365 10 false Top View 5.01,0.094 6.01,0.458 1,0.365 10 false Unlock Rib 5.469,0.438 6.469,0.802 1,0.365 10 false A 3.646,1.375 4.396,1.823 0.75,0.448 10 false Temporary Hold Lock 3.719,3.198 4.229,3.479 0.51,0.281 10 false Lever 1.719,0.469 2.719,0.833 1,0.365 10 false A 0.302,2.865 1.135,3.313 0.833,0.448 10 false Unlock Rib

i.

This mechanism is designed to prevent the connector from being connected only halfway.


ii.

When the holder is connected to the airbag ECU assembly, the unlock rib unlocks the temporary hold lock, allowing the lever to be pushed in by rotating around axis A.


iii.

Locking the lever to the holder locks the holder securely.




ACTIVATION PREVENTION MECHANISM


a.

Function of activation prevention mechanism

i.

An activation prevention mechanism is built into the connector of the airbag system squib circuit to prevent accidental airbag and pretensioner activation.


ii.

This mechanism closes the circuit when the connector is disconnected by bringing the short spring into contact with the terminals and insulating the circuit from external power sources to prevent accidental airbag and pretensioner activation.



b.

Releasing of activation prevention mechanism

i.

To release the activation prevention mechanism, insert a piece of paper with the same thickness as the male terminal (approximately 0.5 mm (0.0197 in.)) between the terminals and short spring to break the connection.


ii.

Refer to the following illustrations concerning connectors utilizing the activation prevention mechanism and its release method.

CAUTION:

Never release the activation prevention mechanism on the squib connector even when inspecting with the squib disconnected.


NOTICE:
·

Do not release the activation prevention mechanism unless specifically directed by the troubleshooting procedure.

·

To prevent the terminal and short spring from being damaged, always use a piece of paper with the same thickness as the male terminal.



C303864
2.49,0.344 2.823,0.542 0.333,0.198 4.615,0.344 4.948,0.542 0.333,0.198 0.219,4.635 0.521,4.844 0.302,0.208 2.938,2.552 3.24,2 3.24,2 2.938,2.24 false 5.792,2.552 6.094,2 6.094,2 5.792,2.24 false 2.354,2.635 2,3.094 2,3.094 2.344,2.333 false 5.344,2.635 4.99,3.094 4.99,3.094 5.333,2.333 false 3.25,5.125 3.25,4.375 false 4.167,4.417 4.167,4 4.167,4 4.333,4 false 5.479,5.115 5.479,4.365 false 6.406,4.417 6.406,4 6.406,4 6.573,4 false 0.052,0.052 3.271,0.458 3.219,0.406 10 false Wire harness connector (to Airbag ECU Assembly): 2.542,0.365 3.792,0.833 1.25,0.469 10 false E14 4.677,0.365 5.927,0.833 1.25,0.469 10 false L47 1.698,1.698 2.76,2.073 1.063,0.375 10 false Before Release 4.698,1.698 5.76,2.073 1.063,0.375 10 false After Release 3.271,1.917 4.333,2.292 1.063,0.375 10 false Paper 6.135,1.917 6.698,2.313 0.563,0.396 10 false Paper 1.646,3.104 2.448,3.448 0.802,0.344 10 false Short Spring 4.635,3.104 5.438,3.448 0.802,0.344 10 false Short Spring 0.052,3.552 2.49,3.958 2.438,0.406 10 false Spiral Cable Sub-assembly Connector: 0.292,4.656 1.542,5.125 1.25,0.469 10 false E9 3.031,3.802 4.094,4.177 1.063,0.375 10 false Before Release 5.292,3.802 6.229,4.188 0.938,0.385 10 false After Release 2.906,5.135 3.969,5.51 1.063,0.375 10 false Short Spring 4.365,3.927 5.427,4.302 1.063,0.375 10 false Paper 5.156,5.135 6.219,5.51 1.063,0.375 10 false Short Spring 6.604,3.927 7.042,4.302 0.438,0.375 10 false Paper 0.552,5.479 1.667,5.719 1.115,0.24 10 false : Short Spring