DTC B1934

id080200805400


System Malfunction Location

•  Driver-side 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.
•  The SAS control module monitors the resistance between the driver-side air bag module terminal 2S and 2P. If the SAS control module detects low resistance between the pins, it will store DTC B1934 in memory and output a pattern 34 flash to the air bag system warning light.

Possible Cause

•  Clock spring wire short circuit
•  Related wiring harness short circuit
•  Driver-side air bag module circuit resistance low
•  SAS control module internal malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
Turn the ignition switch to the LOCK position.
Connect the M-MDS.
Turn the ignition switch to the ON position.
Using the M-MDS, verify the DTCs and record the past malfunction DTCs.
Is the present malfunction DTC B1934 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.
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 B1934 displayed?
Yes
Go to the next step.
No
Replace the driver-side air bag module.
(See DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
After replacement, go to Step 6.
3
Turn the ignition switch to the LOCK position.
Disconnect the SST (diagnostic simulator) from clock spring driver-side air bag module-side connector.
Measure the resistance between clock spring driver-side air bag module-side connector terminal A and B.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and clock spring.
Is the resistance more than 10,000 ohms?
Yes
Go to the next step.
No
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
After replacement, go to Step 6.
4
Disconnect the clock spring connector.
Measure the resistance between clock spring terminal C and D.
Note
•  Inspect the clock spring wiring harness for continuity while shaking it.
Is the resistance more than 10,000 ohms?
Yes
Replace the clock spring.
(See CLOCK SPRING REMOVAL/INSTALLATION.)
After replacement, go to Step 6.
No
Repair the related wiring harness. After repair, 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 the cause of intermittent low resistance between the driver-side air bag module and the SAS control module, and clock spring. 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.