B1651
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1651/33: Manual Cut off Switch Trouble
DTC B1651/33 - Manual Cut off Switch Trouble
DESCRIPTION
The airbag cut-off switch circuit consists of the center airbag sensor assembly and the airbag cut off switch.
DTC B1651/33 is set when a malfunction is detected in the airbag cut off switch circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
CAUTION: 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.
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the center airbag sensor assembly.
(d) Disconnect the connectors from the steering pad.
(e) Disconnect the connector from the front passenger airbag assembly.
(j) Disconnect the connector from the front seat outer belt assembly LH.
(k) Disconnect the connector from the front seat outer belt assembly RH.
HINT: Skip the following steps if side and curtain shield airbags are not fitted.
(f) Disconnect the connector from the front seat airbag assembly LH.
(g) Disconnect the connector from the front seat airbag assembly RH.
(h) Disconnect the connector from the curtain shield airbag assembly LH.
(i) Disconnect the connector from the curtain shield airbag assembly RH.
PROCEDURE
1. CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear any DTCs stored in the memory DTC Check / Clear.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position and wait for at least 60 seconds.
(e) Check for DTCs DTC Check / Clear.
OK:
DTC B1651/33 is not output.
HINT: DTCs other than B1651/33 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 CONNECTORS
(a) Turn the ignition switch to the LOCK position.
(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 assembly and the airbag cut off switch.
OK:
The connectors are properly connected.
NG -- CONNECTION OF CONNECTORS
OK -- Continue to next step.
3. CHECK CONNECTORS
(a) Check that the connectors (on the center airbag sensor assembly side and airbag cut-off switch side) are not damaged Electronic Circuit Inspection Procedure.
NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
4. INSPECT AIRBAG CUT-OFF SWITCH
(a) Disconnect the A20 airbag cut-off switch connector.
(b) Measure the resistance.
Standard resistance:
NG -- REPLACE AIRBAG CUT-OFF SWITCH
OK -- Continue to next step.
5. CHECK INSTRUMENT PANEL WIRE (FOR OPEN)
(a) Disconnect the instrument panel wire connector from the airbag cut off switch.
(b) Using a service wire, connect A20-1 (PMC+) and A20-2 (PMC-) of connector C.
NOTICE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
(c) Measure the resistance.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
6. CHECK INSTRUMENT PANEL WIRE (FOR SHORT)
(a) Disconnect the service wire from connector C.
(b) Measure the resistance.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
7. CHECK INSTRUMENT PANEL WIRE (TO B+)
(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage.
Standard voltage:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
8. CHECK INSTRUMENT PANEL WIRE (TO GROUND)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
9. CHECK CENTER AIRBAG SENSOR ASSEMBLY
(a) Connect the connectors to the center airbag sensor assembly and airbag cut off switch.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(d) Clear any DTCs stored in the memory DTC Check / Clear.
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(g) Check for DTCs DTC Check / Clear.
OK:
DTC B1651/33 is not output.
HINT: DTCs other than B1651/33 may be output at this time, but they are not related to this check.
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK