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DTC B1128:11, B1128:12, B1128:13, B1128:19 OR B1128:1A [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)]

DTC B1128:11, B1128:12, B1128:13, B1128:19 OR B1128:1A [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)]

 id0802g7010500

Note
•  The SRS air bag system can be identified by whether or not the seat track position sensor is present.
―  Standard deployment control system: Without seat track position sensor
―  Two-step deployment control system: With seat track position sensor

Outline

System malfunction location

B1128:11: Driver-side curtain air bag module circuit short to body ground

B1128:12: Driver-side curtain air bag module circuit short to power supply

B1128:13: Driver-side curtain air bag module circuit open circuit or resistance high

B1128:19: Short circuit to driver-side curtain air bag module and other air bag module circuits

B1128:1A: Driver-side curtain air bag module circuit resistance low
Detection condition
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  Resistance other than 0.81—6.42 ohms detected in driver-side curtain air bag module circuit
•  Wiring harness between the driver-side curtain air bag module and SAS control module has a malfunction
Fail-safe
•  Not applicable
Possible cause
•  Driver-side curtain air bag module connector malfunction
•  Open circuit in driver-side curtain air bag module deployment signal circuit
•  Short circuit to body ground in driver-side curtain air bag module deployment signal circuit
•  Short circuit to power supply in driver-side curtain air bag module deployment signal circuit
•  Short circuit to each other in driver-side curtain air bag module deployment signal circuit
•  Short circuit to other air bag module circuits in driver-side curtain air bag module deployment signal circuit
•  Driver-side curtain air bag module malfunction
•  SAS control module malfunction

Diagnostic Procedure

Step

Inspection

Results

Action
1
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CONNECTOR
Warning
•  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.
•  Switch the ignition off.
•  Disconnect the negative battery terminal and wait for 1 min or more.
•  Disconnect the driver-side curtain air bag module connector.
•  Inspect the driver-side curtain air bag module connector (both sides of connector). (Corrosion, damage, and disconnected pins)
•  Is there any malfunction of the driver-side curtain air bag module connector (wiring harness-side)?
Yes
Replace the malfunctioning part and perform the repair completion verification.
No
Go to the next step.
2
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Disconnect the driver-side knee air bag module connector.
•  Disconnect the driver-side air bag module connectors.
•  Remove the clock spring.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side side air bag module connectors.
•  Disconnect the driver and passenger-side front seat connectors.
•  Disconnect the passenger-side curtain air bag module connector.
•  Disconnect the driver and passenger-side front pre-tensioner seat belt connectors.
•  Disconnect the driver and passenger-side rear pre-tensioner seat belt connectors.
•  Disconnect the all SAS control module connectors.
•  Inspect the driver-side curtain air bag module deployment signal circuit for a short to ground.
Note
•  Inspect for a short to ground while shaking the wiring harness between the SAS control module and the driver-side curtain air bag module.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
3
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Driver-side curtain air bag module and SAS control module connectors are disconnected.
•  Inspect the driver-side curtain air bag module deployment signal circuit for open.
Note
•  Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
4
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR SHORT TO EACH OTHER
•  Driver-side curtain air bag module and SAS control module connectors are disconnected.
•  Inspect the driver-side curtain air bag module deployment signal circuit for short to each other.
Note
•  Inspect for short to each other while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
5
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR SHORT TO OTHER AIR BAG MODULE CIRCUIT
•  Driver-side curtain air bag module and SAS control module connectors are disconnected.
•  Other air bag module, pre-tensioner seat belt connectors are disconnected.
•  Refer to the wiring diagram and inspect for continuity between the following terminals and other air bag module/pre-tensioner seat belt terminals (wiring harness-side).
―  SAS control module terminal 2AJ
―  SAS control module terminal 2AN
Note
•  Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
•  Is there continuity?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
No
Go to the next step.
6
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO POWER SUPPLY
•  Driver-side curtain air bag module and SAS control module connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Inspect the driver-side curtain air bag module deployment signal circuit for a short to power supply.
Note
•  Inspect for a short to power supply while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
7
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE
•  Switch the ignition off.
•  Disconnect the negative battery terminal and wait for 1 min or more.
•  Connect the SAS control module connectors.
•  Except for the driver-side curtain air bag module connector, reconnect all disconnected connectors.
•  Apply 2 ohms resistance to the driver-side curtain air bag module connector terminals A and B (wiring harness-side).
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Clear the DTC for the SAS control module using the M-MDS.
•  Perform the DTC inspection for the SAS control module using the M-MDS.
•  Are the same Pending DTCs present?
Yes
Perform the repair completion verification.
No
Replace the driver-side curtain air bag module and perform the repair completion verification.
(See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
(See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
Repair completion verification
PERFORM SAS CONTROL MODULE DTC INSPECTION
•  Switch the ignition off.
•  Disconnect the negative battery terminal and wait for 1 min or more.
•  Disconnect the 2 ohms resistance.
•  Connect the driver-side curtain air bag module connector.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Clear the DTC for the SAS control module using the M-MDS.
•  Perform the DTC inspection for the SAS control module using the M-MDS.
•  Are the same Pending DTCs present?
Yes
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)
If the CAN communication is normal, perform the diagnosis from Step 1.
•  If the malfunction recurs, replace the SAS control module.
No
DTC troubleshooting completed.