Part 1

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1627/82, B1628/82, B1637/82, B1638/82, B1647/82, B1697/82, B1698/82: Lost communication with Side Airbag Sensor LH
B1698/82 - Door Side Airbag Sensor LH Initialization Incomplete

DESCRIPTION

The side collision sensor LH circuit (to determine deployment of the front seat airbag assembly LH, curtain shield airbag assembly LH and front seat outer belt assembly LH) is composed of the airbag ECU assembly, side airbag sensor assembly LH, side No. 2 airbag sensor assembly LH and door side airbag sensor LH.

The side airbag sensor assembly LH, side No. 2 airbag sensor assembly LH and door side airbag sensor LH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

These DTCs are stored when a malfunction is detected for the side collision sensor LH circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.

PROCEDURE

1. CHECK CURRENT DTC

(a) Check for current DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:

HINT
* DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the power switch off and then on (IG) again.
* Codes other than current DTCs B1627, B1628, B1637, B1638, B1647, B1697, B1698 and 82 may be output at this time, but they are not related to this check.

B -- CHECK HISTORY DTC

C -- CHECK CONNECTORS

D -- CHECK CURRENT DTC

E -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK CONNECTORS

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(c) Check that the connectors are properly connected to the airbag ECU assembly, side airbag sensor assembly LH, side No. 2 airbag sensor assembly LH and door side airbag sensor LH. Also check that the connectors that link the floor wire and front door wire LH are properly connected.

OK:

The connectors are properly connected.

HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the airbag ECU assembly, side airbag sensor assembly LH, side No. 2 airbag sensor assembly LH and door side airbag sensor LH. Also disconnect the connectors that link the floor wire and front door wire LH.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.

3. CHECK FLOOR WIRE (OPEN)

(a) Using a service wire, connect terminals 8 (BBL+) and 15 (BBL-) of connector B.

NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

4. CHECK FLOOR WIRE (SHORT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

5. CHECK FLOOR WIRE (SHORT TO B+)

(a) Connect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

(d) Turn the power switch off.

(e) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

6. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

7. CHECK FLOOR WIRE (OPEN)

(a) Using a service wire, connect terminals 4 (BCL+) and 3 (BCL-) of connector C.

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

8. CHECK FLOOR WIRE (SHORT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

9. CHECK FLOOR WIRE (SHORT TO B+)

(a) Connect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

10. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

11. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (OPEN)

(a) Connect the connectors that link the floor wire and front door wire LH.

(b) Using a service wire, connect terminals 2 (BDL+) and 1 (BDL-) of connector E.

NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- CHECK FRONT DOOR WIRE LH (OPEN)
OK -- Continue to next step.

12. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector E.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- CHECK FRONT DOOR WIRE LH (SHORT)
OK -- Continue to next step.

13. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

(a) Connect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG -- CHECK FRONT DOOR WIRE LH (SHORT TO B+)
OK -- Continue to next step.

14. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- CHECK FRONT DOOR WIRE LH (SHORT TO GROUND)
OK -- Continue to next step.

15. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

(a) Connect the connectors to the side No. 2 airbag sensor assembly LH, door side airbag sensor LH and airbag ECU assembly.

(b) Interchange the side airbag sensor assembly LH with RH and connect the connectors.

(c) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the power switch off.

(f) Turn the power switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:

HINT
Codes other than DTCs B1642 or 81 and B1647 or 82 may be output at this time, but they are not related to this check.

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(j) Return the side airbag sensor assembly LH and RH to their original positions and connect the connectors.

Text in Illustration

B -- REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Removal

C -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

16. CHECK SIDE NO. 2 AIRBAG SENSOR ASSEMBLY LH

(a) Interchange the side No. 2 airbag sensor assembly LH with RH and connect the connectors to them.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(c) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the power switch off.

(e) Turn the power switch on (IG), and wait for at least 60 seconds.

(f) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:

HINT
Codes other than DTCs B1642 or 81 and B1647 or 82 may be output at this time, but they are not related to this check.

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(i) Return the side No. 2 airbag sensor assembly LH and RH to their original positions and connect the connectors.

Text in Illustration

B -- REPLACE SIDE NO. 2 AIRBAG SENSOR ASSEMBLY LH Removal

C -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

17. CHECK DOOR SIDE AIRBAG SENSOR LH

(a) Interchange the door side airbag sensor LH with RH and connect the connectors.

HINT
Codes other than DTCs B1642 or 81 and B1647 or 82 may be output at this time, but they are not related to this check.

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(i) Return the door side airbag sensor LH and RH to their original positions and connect the connectors.

Text in Illustration

B -- REPLACE DOOR SIDE AIRBAG SENSOR LH Removal

C -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE AIRBAG ECU ASSEMBLY Removal

18. CHECK HISTORY DTC

(a) Check for history DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:

HINT
Codes other than history DTCs B1627 and B1637 may be output at this time, but they are not related to this check.

B -- CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

C -- CHECK SIDE NO. 2 AIRBAG SENSOR ASSEMBLY LH
A -- Continue to next step.

19. CHECK CURRENT DTC

(a) Check for current DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:

HINT
Codes other than current DTCs B1628 and B1638 may be output at this time, but they are not related to this check.

B -- CHECK CONNECTORS
A -- Continue to next step.

20. CHECK CONNECTORS

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(c) Check that the connectors are properly connected to the airbag ECU assembly and side airbag sensor assembly LH.

OK:

The connectors are properly connected.

HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the airbag ECU assembly and side airbag sensor assembly LH.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

21. CHECK FLOOR WIRE (OPEN)

(a) Using a service wire, connect terminals 8 (BBL+) and 15 (BBL-) of connector B.

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

22. CHECK FLOOR WIRE (SHORT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

23. CHECK FLOOR WIRE (SHORT TO B+)

(a) Connect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

24. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

25. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

(a) Connect the connector to the airbag ECU assembly.

HINT
Codes other than DTCs B1623 and B1628 may be output at this time, but they are not related to this check.

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

(j) Return the side airbag sensor assembly LH and RH to their original positions and connect the connectors.

Text in Illustration

B -- REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Removal

C -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE AIRBAG ECU ASSEMBLY Removal