Lost Communication with Side Satellite Sensor Bus RH - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1642/81: Lost Communication with Side Satellite Sensor Bus RH
B1642/81 - Lost Communication with Side Satellite Sensor Bus RH

DESCRIPTION

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

The side airbag sensor RH (for front side), side airbag sensor RH (for rear side) and rear airbag sensor RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.

DTC B1642/81 is recorded when a malfunction is detected in the circuit for the side collision sensor RH and rear collision sensor RH (to determine deployment of the front seat side airbag RH, curtain shield airbag RH and rear window curtain shield airbag).

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 and side airbag sensor RH (for front side).

OK:

The connectors are properly connected.

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

2. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor assembly and side airbag sensor RH (for front side).

(b) Check that the connectors (on the center airbag sensor assembly side and side airbag sensor RH (for front side) 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 RH (FOR FRONT SIDE) CIRCUIT (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH (FOR FRONT SIDE))

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 17 and 18 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 - FRONT DOOR WIRE RH)
OK -- Continue to next step.

4. CHECK SIDE AIRBAG SENSOR RH (FOR REAR SIDE) CIRCUIT

Text in Illustration

(a) Disconnect the connectors from the side airbag sensor RH (for front side) and side airbag sensor RH (for rear side).

(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 1 and 2 of connector E.

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 E.

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

Standard Resistance:

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

5. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR RH (FOR REAR SIDE) - REAR AIRBAG SENSOR RH)

Text in Illustration

(a) Disconnect the connectors from the side airbag sensor RH (for rear side) and rear airbag sensor RH.

(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 2 and 1 of connector C.

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 C.

(j) 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 SIDE AIRBAG SENSOR RH (FOR FRONT SIDE)

(a) Interchange the side airbag sensor RH (for front side) with side airbag sensor LH (for front side) 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 Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off.

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

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

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 (for front side) and side airbag sensor LH (for front side) to their original positions and connect the connectors to them.

A -- REPLACE SIDE AIRBAG SENSOR RH (FOR FRONT SIDE) Removal

B -- USE SIMULATION METHOD TO CHECK Diagnosis System
C -- Continue to next step.

7. CHECK SIDE AIRBAG SENSOR RH (FOR REAR SIDE)

(a) Interchange the side airbag sensor RH (for rear side) with side airbag sensor LH (for rear side) 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 Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off.

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

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

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 (for rear side) and side airbag sensor LH (for rear side) to their original positions and connect the connectors to them.

A -- REPLACE SIDE AIRBAG SENSOR RH (FOR REAR SIDE) Removal

B -- USE SIMULATION METHOD TO CHECK Diagnosis System
C -- Continue to next step.

8. CHECK REAR AIRBAG SENSOR RH

(a) Interchange the rear airbag sensor RH with rear airbag sensor LH 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 Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off.

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

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

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 RH and rear airbag sensor LH to their original positions and connect the connectors to them.

A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

B -- REPLACE REAR AIRBAG SENSOR RH Removal

C -- USE SIMULATION METHOD TO CHECK Diagnosis System

9. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH)

Text in Illustration

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

(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 17 and 18 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 RH

10. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR RH (FOR REAR SIDE) - FRONT DOOR WIRE RH)

Text in Illustration

(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 and 4 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 RH