B1648
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1648/82: Front Passenger Side Satellite Sensor Bus Initialization Incomplete
DTC B1648/82 - Front Passenger Side Satellite Sensor Bus Initialization Incomplete
DESCRIPTION
The side airbag sensor RH and the rear airbag sensor RH consist of parts including the diagnostic circuit and the lateral deceleration sensor.
When the center airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1648/82 is set when a malfunction is detected in the side airbag sensor RH or rear airbag sensor RH 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 DTC OUTPUT (PAST DTC)
(a) Turn the ignition switch off.
(b) Turn the ignition switch to ON, and wait for at least 60 seconds.
(c) Check the DTCs DTC Check / Clear.
Result:
C -- GO TO ANOTHER TROUBLESHOOTING
B -- GO TO ANOTHER TROUBLESHOOTING
A -- Continue to next step.
2. CHECK CONNECTORS (CENTER AIRBAG SENSOR ASSEMBLY - SIDE AIRBAG SENSOR RH)
(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 floor wire connectors from the center airbag sensor assembly and the side airbag sensor RH.
(d) Check the floor wire connectors and terminals (on the center airbag sensor assembly and the side airbag sensor RH sides) and check that the connectors are properly connected.
Result:
C -- CONNECT CONNECTORS PROPERLY
B -- REPLACE FLOOR WIRE
A -- Continue to next step.
3. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - SIDE AIRBAG SENSOR RH)
(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 K2-4 (BBR+) and K2-3 (BBR-) of connector C.
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 C.
(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 FLOOR WIRE
OK -- Continue to next step.
4. CHECK CONNECTORS (SIDE AIRBAG SENSOR RH - REAR AIRBAG SENSOR RH)
(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 floor wire connectors from the side airbag sensor RH and the rear airbag sensor RH.
(d) Check the floor wire connectors and terminals (on the side airbag sensor RH and the rear airbag sensor RH sides) and check that the connectors are properly connected.
Result:
C -- CONNECT CONNECTORS PROPERLY
B -- REPLACE FLOOR WIRE
A -- Continue to next step.
5. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR RH - REAR AIRBAG SENSOR RH)
(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 K3-1 (BCR-) and K3-2 (BCR+) of connector C.
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 C.
(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 FLOOR WIRE
OK -- Continue to next step.
6. CHECK SIDE AIRBAG SENSOR RH
(a) Connect the connector to the center airbag sensor assembly.
(b) Interchange the side airbag sensor RH with the side airbag sensor LH 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:
HINT: DTCs other than DTC B1643/81 and B1648/82 may be output at this time, but they are not related to this check.
C -- USE SIMULATION METHOD TO CHECK
B -- REPLACE SIDE AIRBAG SENSOR RH
A -- Continue to next step.
7. CHECK REAR AIRBAG SENSOR RH
(a) Connect the connector to the side airbag sensor RH.
(b) Interchange the rear airbag sensor RH with the rear airbag sensor LH 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:
HINT: DTCs other than DTC B1643/81 and B1648/82 may be output at this time, but they are not related to this check.
C -- REPLACE REAR AIRBAG SENSOR RH
B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- USE SIMULATION METHOD TO CHECK