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DTC U0156:41 OR U0156:82 [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)]

DTC U0156:41 OR U0156:82 [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)]

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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

U0156:41: Communication error with instrument cluster (check sum error)

U0156:82: Communication error with instrument cluster (counter error)
Detection condition
U0156:41
•  The SAS control module detects that a check sum error received from the instrument cluster.
U0156:82
•  The SAS control module detects that a counter value error received from the instrument cluster.
Fail-safe
•  Not applicable
Possible cause
•  Instrument cluster malfunction
•  Noise enters communication signal with instrument cluster
•  BCM malfunction
•  SAS control module malfunction
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY OTHER SAS CONTROL MUDULE DTCs
•  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.
•  Is DTC U3000:49 displayed?
Yes
Go to the applicable DTC inspection.
(See DTC U3000:49 [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)
No
Go to the next step.
2
VERIFY BODY CONTROL MODULE (BCM) DTCs
•  Retrieve the body control module (BCM) DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No
Go to the next step.
3
VERIFY IF MALFUNCTIONING LOCATION IS INSTRUMENT CLUSTER DEPENDING ON REPEATABILITY
•  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.
•  Is the same Pending DTC present?
Yes
Replace the instrument cluster and perform the repair completion verification.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
Repair completion verification
PERFORM SAS CONTROL MODULE DTC INSPECTION
•  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.