B1608

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1607/84,B1608/84,B1617/84,B1618/84:

DTC B1607/84 - Lost Communication with Front Satellite Sensor Bus LH

DTC B1608/84 - Front Satellite Sensor Bus LH Initialization Incomplete

DTC B1617/84 - Lost Communication with Front Airbag Sensor LH

DTC B1618/84 - Front Airbag Sensor LH Initialization Incomplete

DESCRIPTION

The front airbag sensor LH circuit consists of the center airbag sensor and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1607/84, B1608/84, B1617/84 or B1618/84 is recorded when a malfunction is detected in the front airbag sensor LH circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTION OF CONNECTORS
(a) Turn the ignition switch to 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 and the front airbag sensor LH.
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 front airbag sensor LH.
(b) Check that the connectors (on the center airbag sensor side and front 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 FRONT AIRBAG SENSOR LH CIRCUIT




(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 to OFF.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 30 (+SL) and 28 (-SL) 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 INSTRUMENT PANEL WIRE ASSEMBLY (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)
OK -- Continue to next step.
4. CHECK FRONT AIRBAG SENSOR LH




(a) Connect the connectors to the center airbag sensor.
(b) Interchange the front airbag sensor LH with RH and connect the connectors to them.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to ON, and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the ignition switch to OFF.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.

Result





HINT: Codes other than B1602, B1603, B1607, B1608, DTC B1612, B1613, B1617 and B1618 or 83 and 84 may be output at this time, but they are not related to this check.

B -- REPLACE FRONT AIRBAG SENSOR LH
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK
5. CHECK INSTRUMENT PANEL WIRE ASSEMBLY (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)




(a) Disconnect the instrument panel wire connector from the engine room main wire.
(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 to OFF.
(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 30 (+SL) and 28 (-SL) 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 INSTRUMENT PANEL WIRE ASSEMBLY
OK -- REPLACE ENGINE ROOM MAIN WIRE