DTC U2527

id080200000100

DTC U2527

DSC/RSC HU/CM communication fault
DETECTION CONDITION
Communication error to DSC/RSC HU/CM
POSSIBLE CAUSE
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.
•  Open circuit in wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P
•  Open circuit in wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M
•  Short to power supply in wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P
•  Short to power supply in wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M
•  Short to GND in wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P
•  Short to GND in wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M
•  DSC/RSC HU/CM malfunction
•  SAS control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DSC/RSC HU/CM CONNECTOR
•  Turn the ignition switch to OFF position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Disconnect the DSC/RSC HU/CM connector.
•  Inspect the DSC/RSC HU/CM connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to next step.
No
Go to the next step.
2
INSPECT SAS CONTROL MODULE CONNECTOR
•  Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Inspect the SAS control module connector terminal for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to next step.
No
Go to the next step.
3
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE SIDE AIR BAG MODULE AND SAS CONTROL MODULE
•  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)
•  Disconnect the clock spring connector. (See COMBINATION SWITCH REMOVAL/INSTALLATION.)
•  Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
•  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Disconnect the passenger-side front seat connector. (See FRONT SEAT REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side curtain air bag module connectors. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Inspect the wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P, SAS control module terminal 2D and DSC/RSC HU/CM terminal M for the following:
―  Short to body ground
―  Open circuit
―  Short circuit between terminals
Note
•  Inspect for continuity while shaking the wiring harness between the DSC/RSC HU/CM and SAS control module.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness between the SAS control module and the DSC/RSC HU/CM, then go to next step.
4
INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND DSC/RSC HU/CM FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position with SAS control module and DSC/RSC HU/CM connector disconnected.
•  Measure the voltage of SAS control module connector terminals 2H and 2D of SAS control module harness side connector.
Note
•  Measure the voltage while shaking the wiring harness between the SAS control module and DSC/RSC HU/CM.
•  Is the voltage measured?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No
Replace the DSC/RSC HU/CM, then go to the next step.
(See DSC/RSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC/RSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
5
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the SAS control module memory using the M-MDS.
•  Turn the ignition switch to OFF position then ON position.
•  Is the same DTC present?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.