B1647

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1632/81,B1637/82,B1642/81,B1647/82: Lost Communication with Rear Airbag Sensor RH
B1647/82 - Lost Communication with Side Satellite Sensor Bus LH

DESCRIPTION

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

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

DTC B1632/81 or B1637/82 is recorded when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC B1642/81 or B1647/82 is recorded when a malfunction is detected in the circuit for the side satellite sensor bus LH or RH (to determine deployment of the front and rear seat side airbag LH or RH and curtain shield airbag LH or RH).

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* w/ Navigation System (for HDD):
After the power switch is turned OFF, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch OFF, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:

* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

PROCEDURE

1. CHECK FOR DTC

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

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

(c) Turn the power switch OFF.

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

(e) Check for DTCs DTC Check / Clear.

Result

HINT
Codes other than DTC B1632, B1637, B1642 and B1647 may be output at this time, but they are not related to this check.

B -- CHECK CONNECTION OF CONNECTORS

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

2. CHECK CONNECTION OF CONNECTORS

(a) Turn the power 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, the side airbag sensor RH and rear airbag sensor RH.

OK:

The connectors are properly connected.

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

3. CHECK CONNECTORS

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

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

OK:

The connectors are not deformed or damaged.

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

4. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH)

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

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

(f) Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.

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

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

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

5. CHECK SIDE AIRBAG SENSOR RH

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

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

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

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

(e) Turn the power switch OFF.

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

(g) Check for DTCs DTC Check / Clear.

Result

(h) Turn the power switch OFF.

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

B -- REPLACE SIDE AIRBAG SENSOR RH Removal

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

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

(d) Turn the power switch OFF.

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

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

(g) Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

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

7. CHECK REAR AIRBAG SENSOR RH

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

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

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

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

(e) Turn the power switch OFF.

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

(g) Check for DTCs DTC Check / Clear.

Result

(h) Turn the power switch OFF.

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

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

B -- REPLACE REAR AIRBAG SENSOR RH Removal

A -- USE SIMULATION METHOD TO CHECK Diagnosis System

C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

8. CHECK CONNECTION OF CONNECTORS

(a) Turn the power 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, the side airbag sensor LH and rear airbag sensor LH.

OK:

The connectors are properly connected.

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

9. CHECK CONNECTORS

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

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

OK:

The connectors are not deformed or damaged.

NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

10. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR LH)

(d) Turn the power 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 24 (BBL+) and 23 (BBL-) of connector B.

NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service 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 -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

11. CHECK SIDE AIRBAG SENSOR LH

(h) Turn the power switch OFF.

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

B -- REPLACE SIDE AIRBAG SENSOR LH Removal

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

12. CHECK NO. 2 FLOOR WIRE (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH)

(d) Turn the power switch OFF.

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

(f) Disconnect the connectors from the side airbag sensor LH and rear airbag sensor LH.

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

NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service 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 NO. 2 FLOOR WIRE
OK -- Continue to next step.

13. CHECK REAR AIRBAG SENSOR LH