Front Satellite Sensor Bus LH Initialization Incomplete - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1608/84: Front Satellite Sensor Bus LH Initialization Incomplete

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 consists of parts including the diagnostic circuit and the frontal deceleration sensor.
When the center airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1608/84, B1617/84 or B1618/84 is set when a malfunction is detected in the front airbag sensor LH circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTE: In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the center airbag sensor assembly.
4. Disconnect the connectors from the steering pad.
5. Disconnect the connectors from the front passenger airbag assembly.
6. Disconnect the connector from the front seat outer belt assembly LH.
7. Disconnect the connector from the front seat outer belt assembly RH.
8. Disconnect the connector from the front seat side airbag assembly LH.
9. Disconnect the connector from the front seat side airbag assembly RH.
10. Disconnect the connector from the curtain shield airbag assembly LH.
11. Disconnect the connector from the curtain shield airbag assembly RH.

PROCEDURE

1. CHECK CONNECTOR (INSTRUMENT PANEL WIRE - CENTER AIRBAG SENSOR ASSEMBLY)
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the instrument panel wire connector from the center airbag sensor assembly.
(d) Check the instrument panel wire connector and terminals (on the center airbag sensor assembly side) and check that the connector is properly connected to the center airbag sensor assembly.
Result:

C -- CONNECT CONNECTOR PROPERLY
B -- REPLACE INSTRUMENT PANEL WIRE
A -- Continue to next step.
2. CHECK CONNECTOR (ENGINE ROOM MAIN WIRE - FRONT AIRBAG SENSOR LH)
(a) Disconnect the engine room main wire connector from the front airbag sensor LH.
(b) Check the engine room main wire connector and terminals (on the front airbag sensor LH side) and check that the connector is properly connected to the front airbag sensor LH.
Result:

C -- CONNECT CONNECTOR PROPERLY
B -- REPLACE ENGINE ROOM MAIN WIRE
A -- Continue to next step.
3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT

(a) Check for short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:

(4) Turn the ignition switch off.
(5) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(b) Check for open in the circuit.
(1) Using a service wire, connect A15-1 and A15-2 of connector E.
NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.

(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

(c) Check for short in the circuit.
(1) Disconnect the service wire from connector E.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

(d) Check for short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- CHECK CONNECTOR (ENGINE ROOM MAIN WIRE - INSTRUMENT PANEL WIRE)
OK -- Continue to next step.
4. CHECK FRONT AIRBAG SENSOR LH

(a) Connect the connectors to the center airbag sensor assembly.
(b) Interchange the front airbag sensor LH with the front airbag sensor 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 off.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
Result:

B -- REPLACE FRONT AIRBAG SENSOR LH
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
5. CHECK CONNECTOR (ENGINE ROOM MAIN WIRE - INSTRUMENT PANEL WIRE)
(a) Disconnect the engine room main wire connector from the instrument panel wire.
(b) Check the engine room main wire connector and terminals (on the instrument panel wire side) and check that the connector is properly connected to the instrument panel wire.
Result:

C -- CONNECT CONNECTOR PROPERLY
B -- REPLACE ENGINE ROOM MAIN WIRE
A -- Continue to next step.
6. CHECK ENGINE ROOM MAIN WIRE

(c) Check for short in the circuit.
(1) Disconnect the service wire from connector E.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

(d) Check for short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPLACE ENGINE ROOM MAIN WIRE
OK -- REPLACE INSTRUMENT PANEL WIRE