DTC U2018

id080200808400


System Malfunction Location

•  Passenger-side side air bag sensor (communication error)

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 passenger-side side air bag sensor monitors the scale of an impact. If the crash event is severe enough for the passenger-side side air bag module to operate (deploy), the sensor will signal the SAS control module to operate (deploy) the passenger-side side air bag. The SAS control module monitors signals which are not within the specification to the passenger-side side air bag sensor. If the SAS control module receives a signal from the passenger-side side air bag sensor which indicates a communication error, it will store DTC U2018 in memory and output a pattern 45 flash to the air bag system warning light.

Possible Cause

•  Wiring harness damage between passenger-side side air bag sensor and SAS control module
•  Passenger-side side air bag sensor damage

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 U2018 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 9.
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.
Verify that the passenger-side side air bag sensor connector is connected properly.
Is the driver-side side air bag sensor connector connected properly?
Yes
Go to the next step.
No
Connect the connector properly, and go to Step 10.
3
Turn the ignition switch to the LOCK position.
Disconnect the SAS control module connector.
Disconnect the passenger-side side air bag sensor connector.
Measure the resistance between SAS control module terminal 1H and passenger-side side air bag sensor terminal A.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance more than 1 ohm?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Go to the next step.
4
Measure the resistance between SAS control module terminal 1K and passenger-side side air bag sensor terminal B.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance more than 1 ohm?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Go to the next step.
5
Disconnect SAS control module connector.
Measure the resistance between SAS control module terminal 1H and 2Q.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance less than 10,000 ohms?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Go to the next step.
6
Measure the resistance between SAS control module terminal 1K and 2Q.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance less than 10,000 ohms?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Go to the next step.
7
Turn the ignition switch to the LOCK position.
Disconnect the negative battery cable.
Turn the ignition switch to the ON position.
Measure the resistance between SAS control module terminal 1H and SAS control module connector terminal 2V.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance less than 10,000 ohms?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Go to the next step.
8
Measure the resistance between SAS control module terminal 1K and SAS control module connector terminal 2V.
Note
•  Measure the resistance while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor.
Is the resistance less than 10,000 ohms?
Yes
Repair the related wiring harness. After repair, go to Step 10.
No
Replace the passenger-side side air bag sensor.
(See PASSENGER-SIDE SIDE AIR BAG SENSOR REMOVAL/INSTALLATION.)
After replacement, go to Step 10.
9
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 the communication error. 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.
10
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.