B1677

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1676/85: Lost Communication with Rear Floor Airbag Sensor RH

DTC B1676/85 - Lost Communication with Rear Floor Airbag Sensor RH

DTC B1677/85 - Rear Floor Airbag Sensor RH Initialization Incomplete

DTC B1694/85 - Side Satellite Sensor No. 2 Bus RH Initialization Incomplete

DESCRIPTION
HINT:
"Rear floor airbag sensor RH" refers to the rear floor airbag sensor.

- The rear floor airbag sensor circuit consists of the center airbag sensor and rear floor airbag sensor.
The rear floor airbag sensor detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1676/85, B1677/85 or B1694/85 is stored when a malfunction is detected in the rear floor airbag sensor circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- w/ Navigation system:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
- When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

PROCEDURE

1. CHECK CONNECTION OF CONNECTORS
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor and the rear floor airbag sensor.
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 and rear floor airbag sensor.
(b) Check that the connectors (on the center airbag sensor side and rear floor airbag sensor side) are not damaged.
OK:
The connectors are not deformed or damaged.
NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK REAR FLOOR AIRBAG SENSOR CIRCUIT





(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





(c) Turn the engine switch off.
(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(e) Using a service wire, connect terminals 20 (BCR+) and 19 (BCR-) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





(g) Disconnect the service wire from connector B.
(h) 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.
4. CHECK REAR FLOOR AIRBAG SENSOR





(a) Connect the connectors to the center airbag sensor.
(b) Temporarily replace the rear floor airbag sensor with a new one.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the engine switch off.
(g) Turn the engine switch on (IG), and wait for at least 60 seconds.
(1) Check for DTCs DTC Check / Clear.
OK:
DTC B1676, B1677 and B1694 are not output.
HINT:
Codes other than DTC B1676, B1677 and B1694 may be output at this time, but they are not related to this check.

B -- REPLACE REAR FLOOR AIRBAG SENSOR
A -- USE SIMULATION METHOD TO CHECK
C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY