DTC B1993

id080200805700

System Malfunction Location

• Driver-side side air bag module circuit short to body ground

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.

• The SAS control module monitors the driver-side side air bag module circuit at SAS control module terminal 1G and 1D for a short to body ground. If the SAS control module detects resistance of less than 10,000 ohms in any pin, it will store DTC B1993 in memory and output a pattern 36 flash to the air bag system warning light.

Possible Cause

• Short to body ground between driver-side side air bag module and SAS control module

• Driver-side side air bag module short to body ground

• SAS control module internal malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
Turn the ignition switch to the LOCK position.
Connect the WDS or the equivalent.
Turn the ignition switch to the ON position.
Using the WDS or equivalent, verify the DTCs and record the past malfunction DTCs.
Is the present malfunction DTC B1993 displayed?
Yes
Note
• Indicates a hard malfunction. The malfunction is still present. This malfunction cannot be cleared until it is corrected and the DTC is no longer displayed.
Go to the next step.
No
Intermittent malfunction. The malfunction is not present at this time. Go to Step 5.
2
Warning
• Handling the components improperly can accidentally deploy the air bags and pre-tensioner front buckle, which may seriously injure you. Read the service warnings and cautions before handling the SRS air bag system components.
(See SERVICE WARNINGS.)
(See SERVICE CAUTIONS.)
Turn the ignition switch to the LOCK position.
Refer to the air bag system deactivation procedure and deactivate the system.
Turn the ignition switch to the ON position.
Perform the DTC inspection.
Is the present malfunction DTC B1993 displayed?
Yes
Go to the next step.
No
Replace the driver-side side air bag module.
After replacement, go to Step 6.
3
Turn the ignition switch to the LOCK position.
 
Disconnect the SAS control module connector.
Measure the resistance between SAS control module terminal 2G and 2Q.
Is the resistance less than 10,000 ohms?
Yes
Repair the related wiring harness. After repair, go to Step 6.
No
Go to the next step.
4
Disconnect the SST (diagnostic simulator) from driver-side side air bag module connector.
Inspect the connector or wiring harness for malfunction.
Is there any malfunction?
Yes
Repair or replace the connector or the wiring harness.
After repair or replacement, go to Step 6.
No
Replace the SAS control module.
After replacement, go to Step 6.
5
Refer to the past malfunction DTCs recorded during Step 1.
Are the past malfunction DTCs displayed during Step 1 intermittent malfunctions which are not displayed as present malfunction DTCs?
Yes
Inspect for an intermittent short to body ground between the driver-side side air bag module and the SAS control module. Attempt to replicate the malfunction by flexing the wiring harness and cycling the ignition key between the ON and LOCK position repeatedly. Repair or replace if there is any intermittent malfunction.
After repair or replacement, go to the next step.
No
Go to the next step.
6
Refer to the past malfunction DTCs recorded during Step 1.
Was any past malfunction DTC displayed during Step 1?
Yes
If any DTC is displayed, refer to the DTC table, and repair the malfunctioning part according to the DTC inspection.
No
Refer to the reactivation procedure in the air bag system deactivation procedure, reactivate the system. Clear all DTCs.