DTC B1226:02 [TWO-STEP DEPLOYMENT CONTROL SYSTEM]

id0802b2027800

System malfunction location	•  B1226:02:Signal reception error from driver or passenger-side pressure sensor
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. •  SAS control module detects a large deviation between the driver-side and passenger-side pressure sensor values
Fail-safe function	Not applicable
Possible cause	•  Driver or passenger-side pressure sensor connector malfunction •  Open circuit in the wiring harness between the following terminals: ―  SAS control module terminal 1V—driver-side pressure sensor terminal A ―  SAS control module terminal 1T—driver-side pressure sensor terminal B ―  SAS control module terminal 1B—passenger-side pressure sensor terminal A ―  SAS control module terminal 1F—passenger-side pressure sensor terminal B •  Driver or passenger-side pressure sensor malfunction •  SAS control module malfunction

Diagnostic Procedure

Warning

•  Handling the component parts improperly can accidentally operate (deploy) the air bag modules, pre-tensioner seat belts and lap pre-tensioner seat belts, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.

(See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

Step	Inspection		Action
1	INSPECT DRIVER-SIDE PRESSURE SENSOR •  Verify that the driver-side pressure sensor is correctly installed. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Is the driver-side pressure sensor correctly installed?	Yes	Go to the next step.
		No	Correctly install the driver-side pressure sensor. Then go to step 10.
2	INSPECT DRIVER-SIDE PRESSURE SENSOR CONNECTOR •  Switch the ignition off. •  Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Remove the driver-side front door trim. (See FRONT DOOR TRIM REMOVAL/INSTALLATION.) •  Disconnect the driver-side pressure sensor connector. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Inspect the driver-side pressure sensor connector. (Corrosion, damage, and disconnected pins) •  Is there any malfunction of the driver-side pressure sensor connector?	Yes	Replace the malfunctioning part, then go to step 10.
		No	Go to the next step.
3	INSPECT DRIVER-SIDE PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT •  Driver-side pressure sensor and SAS control module connectors are disconnected. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Inspect for continuity between the following terminals (wiring harness-side): ―  Driver-side pressure sensor terminal A—SAS control module terminal 1V ―  Driver-side pressure sensor terminal B—SAS control module terminal 1T Note •  Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side pressure sensor. •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side pressure sensor terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Replace the malfunctioning part. If there is no common connector: •  Replace the wiring harness which has an open circuit. Go to step 10.
4	INSPECT PASSENGER-SIDE PRESSURE SENSOR •  Verify that the passenger-side pressure sensor is correctly installed. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Is the passenger-side pressure sensor correctly installed?	Yes	Go to the next step.
		No	Correctly install the passenger-side pressure sensor. Then go to step 10.
5	INSPECT PASSENGER-SIDE PRESSURE SENSOR CONNECTOR •  Remove the passenger-side front door trim. (See FRONT DOOR TRIM REMOVAL/INSTALLATION.) •  Disconnect the passenger-side pressure sensor connector. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Inspect the passenger-side pressure sensor connector. (Corrosion, damage, and disconnected pins) •  Is there any malfunction of the passenger-side pressure sensor connector?	Yes	Replace the malfunctioning part, then go to step 10.
		No	Go to the next step.
6	INSPECT PASSENGER-SIDE PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT •  Passenger-side pressure sensor and SAS control module connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Passenger-side pressure sensor terminal A—SAS control module terminal 1B ―  Passenger-side pressure sensor terminal B—SAS control module terminal 1F Note •  Inspect for continuity while shaking the wiring harness between the SAS control module and passenger-side pressure sensor. •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and passenger-side pressure sensor terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Replace the malfunctioning part. If there is no common connector: •  Replace the wiring harness which has an open circuit. Go to step 10.
7	PERFORM SAS CONTROL MODULE DTC INSPECTION •  Connect the SAS control module connectors. •  Reconnect all disconnected connectors. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Are the same DTCs present?	Yes	Go to the next step.
		No	DTC troubleshooting completed.
8	DETERMINE IF MALFUNCTION CAUSE IS DRIVER-SIDE PRESSURE SENSOR •  Replace the driver-side pressure sensor. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Switch the ignition ON (engine off or on). •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Are the same DTCs present?	Yes	Go to the next step.
		No	DTC troubleshooting completed.
9	DETERMINE IF MALFUNCTION CAUSE IS PASSENGER-SIDE PRESSURE SENSOR •  Replace the passenger-side pressure sensor. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Switch the ignition ON (engine off or on). •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Are the same DTCs present?	Yes	Go to the next step.
		No	DTC troubleshooting completed.
10	PERFORM SAS CONTROL MODULE DTC INSPECTION •  Connect the SAS control module connectors. •  Reconnect all disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Are the same DTCs present?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
		No	DTC troubleshooting completed.