Lost Communication with Side Satellite Sensor Bus LH - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1647/82: Lost Communication with Side Satellite Sensor Bus LH
B1647/82 - Lost Communication with Side Satellite Sensor Bus LH

DESCRIPTION

The circuit for the side collision sensor LH (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.

DTC B1647/82 is recorded when a malfunction is detected in the circuit for the side collision sensor LH (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

(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.

NG -- CONNECT CONNECTOR PROPERLY
OK -- Continue to next step.

2. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor assembly, side airbag sensor LH and rear airbag sensor LH.

(b) Check that the connectors (on the center airbag sensor assembly side, side airbag sensor LH side and rear airbag sensor LH side) are not damaged.

OK:

The connectors are not deformed or damaged.

NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. CHECK SIDE AIRBAG SENSOR LH CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY - SIDE AIRBAG SENSOR LH)





Text in Illustration





(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

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

Standard Voltage:





(d) Turn the ignition switch off.

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

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

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

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

Standard Resistance:





(h) Disconnect the service wire from connector B.

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

Standard Resistance:





NG -- CHECK FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - FRONT DOOR WIRE LH)
OK -- Continue to next step.

4. CHECK REAR AIRBAG SENSOR LH CIRCUIT (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH)





Text in Illustration





(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

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

Standard Voltage:





(d) Turn the ignition switch off.

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

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

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

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

Standard Resistance:





(h) Disconnect the service wire from connector E.

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

Standard Resistance:





NG -- CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH - FRONT DOOR WIRE LH)
OK -- Continue to next step.

5. CHECK SIDE AIRBAG SENSOR LH





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

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in the memory DTC Check / Clear.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 90 seconds.

(g) Check for DTCs DTC Check / Clear.

Result





Text in Illustration





(h) Turn the ignition switch off.

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

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

A -- USE SIMULATION METHOD TO CHECK Diagnosis System

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

6. CHECK REAR AIRBAG SENSOR LH





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

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in the memory DTC Check / Clear.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 90 seconds.

(g) Check for DTCs DTC Check / Clear.

Result





Text in Illustration





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

(h) Turn the ignition switch off.

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

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

A -- REPLACE REAR AIRBAG SENSOR LH Removal

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

C -- USE SIMULATION METHOD TO CHECK Diagnosis System

7. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - FRONT DOOR WIRE LH)





Text in Illustration





(a) Disconnect the floor wire connector from the front door wire LH.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON.

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

Standard Voltage:





(e) Turn the ignition switch off.

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

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

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

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

Standard Resistance:





(i) Disconnect the service wire from connector B.

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

Standard Resistance:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT DOOR WIRE LH

8. CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH - FRONT DOOR WIRE LH)





Text in Illustration





(a) Disconnect the floor wire connector from the front door wire LH.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON.

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

Standard Voltage:





(e) Turn the ignition switch off.

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

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

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

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

Standard Resistance:





(i) Disconnect the service wire from connector B.

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

Standard Resistance:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT DOOR WIRE LH