B1635

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1635/24: Front Passenger Side Rear Airbag Sensor Circuit Malfunction

DTC B1635/24 - Front Passenger Side Rear Airbag Sensor Circuit Malfunction

DESCRIPTION

The rear airbag sensor RH consists of the safing sensor, the diagnostic circuit and the lateral deceleration sensor. The center airbag sensor receives signals from the lateral deceleration sensor and determines whether or not the SRS should be activated.
DTC B1635/24 is recorded when a malfunction is detected in the rear airbag sensor RH circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC




(a) Turn the power switch ON (IG), and wait for at least 60 seconds.
(b) Clear the DTCs 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.
OK:
DTC B1635/24 is not output.
HINT: DTCs other than DTC B1635/24 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.

2. CHECK CONNECTION OF CONNECTOR
(a) Turn the power 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 rear airbag sensor RH.
OK:
Connectors are connected.
NG -- CONNECT CONNECTOR
OK -- Continue to next step.

3. CHECK FLOOR WIRE NO. 2 (OPEN)




(a) Disconnect the connectors from the center airbag sensor and rear airbag sensor RH.
(b) Using a service wire, connect terminals C16-2 (VUCR) and C16-1 (ESCR) of connector C.
NOTE: Do not forcibly insert a service wire into the terminals of the connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






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

4. CHECK FLOOR WIRE NO. 2 (SHORT)




(a) Disconnect the service wire from connector C.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






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

5. CHECK FLOOR WIRE NO. 2 (TO B+)




(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Turn the power switch ON (IG).
(c) Measure the voltage of the wire harness side connector.
Standard voltage:






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

6. CHECK FLOOR WIRE NO. 2 (TO GROUND)




(a) Turn the power switch OFF.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






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

7. CHECK REAR AIRBAG SENSOR RH




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

Result





HINT: DTCs other than DTC B1630/23 and B1635/24 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