Lost communication with Side Airbag Sensor LH - Airbag System (except TMC Made)

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM (except TMC Made): B1627/82,B1628/82,B1637/82,B1638/82,B1647/82: Lost communication with Side Airbag Sensor LH
B1647/82 - Lost Communication with Side Satellite Sensor Bus LH

DESCRIPTION

The side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) is composed of the center airbag sensor assembly, side airbag sensor LH and rear airbag sensor LH.

The side airbag sensor LH and rear airbag sensor LH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK PRESENT DTC

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

(b) Check for present DTCs Airbag System (except TMC Made).

Result:

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

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

D -- CHECK SIDE AIRBAG SENSOR LH

C -- CHECK CONNECTORS

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

2. CHECK HISTORY DTC

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

(b) Check for history DTCs Airbag System (except TMC Made).

Result:

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

C -- CHECK SIDE AIRBAG SENSOR LH

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

3. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

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

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

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

OK:

The terminals are not deformed or damaged.

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

4. CHECK FLOOR WIRE (OPEN)

(a) Using SST, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.

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

SST : 09843-18040

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

Standard Resistance:

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

5. CHECK FLOOR WIRE (SHORT)

(a) Disconnect SST from connector B.

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

Standard Resistance:

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

6. CHECK FLOOR WIRE (SHORT TO B+)

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

(b) Turn the ignition 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.

7. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the ignition switch off.

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

8. CHECK FLOOR WIRE (OPEN)

(a) Using SST, connect terminals 2 (BCL+) and 1 (BCL-) of connector C.

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

9. CHECK FLOOR WIRE (SHORT)

(a) Disconnect SST from connector C.

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

Standard Resistance:

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

10. CHECK FLOOR WIRE (SHORT TO B+)

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

(b) Turn the ignition 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.

11. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the ignition switch off.

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

12. CHECK SIDE AIRBAG SENSOR LH

(a) Connect the connectors to the rear airbag sensor LH and center airbag sensor assembly.

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

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

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

(e) Clear the DTCs stored in the memory Airbag System (except TMC Made).

(f) Turn the ignition switch off.

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

(h) Check for DTCs Airbag System (except TMC Made).

Result:

HINT
Codes other than DTCs B1623, B1642 or 81 and B1628, B1647 or 82 may be output at this time, but they are not related to this check.

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

B -- REPLACE SIDE AIRBAG SENSOR LH Removal
A -- Continue to next step.

13. CHECK REAR AIRBAG SENSOR LH

(a) Turn the ignition switch off.

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

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

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

(d) Interchange the rear airbag sensor RH with LH and connect the connectors to them.

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

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

(g) Clear the DTCs stored in the memory Airbag System (except TMC Made).

(h) Turn the ignition switch off.

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

(j) Check for DTCs Airbag System (except TMC Made).

Result:

HINT
Codes other than DTCs B1623, B1642 or 81 and B1628, B1647 or 82 may be output at this time, but they are not related to this check.

C -- REPLACE REAR AIRBAG SENSOR LH Removal

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

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

14. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

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

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

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

OK:

The terminals are not deformed or damaged.

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

15. CHECK FLOOR WIRE (OPEN)

(a) Using SST, connect terminals 2 (BCL+) and 1 (BCL-) of connector C.

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

16. CHECK FLOOR WIRE (SHORT)

(a) Disconnect SST from connector C.

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

Standard Resistance:

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

17. CHECK FLOOR WIRE (SHORT TO B+)

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

(b) Turn the ignition 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.

18. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the ignition switch off.

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

19. CHECK SIDE AIRBAG SENSOR LH

(a) Connect the connector to the rear airbag sensor LH.

HINT
Codes other than DTCs B1632, B1633, B1637 and B1638 may be output at this time, but they are not related to this check.

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

B -- REPLACE SIDE AIRBAG SENSOR LH Removal
A -- Continue to next step.

20. CHECK REAR AIRBAG SENSOR LH

(a) Turn the ignition switch off.

HINT
Codes other than DTCs B1632, B1633, B1637 and B1638 may be output at this time, but they are not related to this check.

C -- REPLACE REAR AIRBAG SENSOR LH Removal

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

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

21. CHECK SIDE AIRBAG SENSOR LH

(a) Turn the ignition switch off.

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

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

(c) Interchange the side airbag sensor RH with LH and connect the connectors to them.

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

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

(f) Clear the DTCs stored in the memory Airbag System (except TMC Made).

(g) Turn the ignition switch off.

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

(i) Check for DTCs Airbag System (except TMC Made).

Result:

HINT
Codes other than DTCs B1622 and B1627 may be output at this time, but they are not related to this check.

C -- REPLACE SIDE AIRBAG SENSOR LH Removal

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

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