DTC U0316:09 [RADAR UNIT]

id1502a6018900

Description

Error signal received from DSC HU/CM
Detection condition
•  There is an error in the following signals sent from the DSC HU/CM.
?  Yaw rate signal
?  Lateral-G signal
?  Longitudinal-G signal
?  Wheel speed signal
?  Brake fluid pressure signal
?  Cruise control system control signal
?  Signal error in brake light circuit
Fail-safe
•  Inhibits the Mazda radar cruise control (MRCC) system control
•  Inhibits the smart brake support (SBS) system control
•  Inhibits the distance recognition support system (DRSS) control
Possible cause
•  DTCs are stored in the SAS control module.
?  SAS control module malfunction
•  DTCs are stored in the DSC HU/CM.
•  DTCs are stored in the rear body control module (RBCM).
?  Rear body control module (RBCM) malfunction
•  DSC HU/CM malfunction
•  Radar unit malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY SAS CONTROL MODULE DTCs
•  Retrieve the SAS control module 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 [SAS CONTROL MODULE].)
No
Go to the next step.
2
VERIFY DSC HU/CM DTCs
•  Retrieve the DSC HU/CM 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 [DSC HU/CM].)
No
Go to the next step.
3
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs
•  Retrieve the rear body control module (RBCM) 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 [REAR BODY CONTROL MODULE (RBCM)].)
No
Go to the next step.
4
VERIFY IF MALFUNCTIONING LOCATION IS DSC HU/CM DEPENDING ON REPEATABILITY
•  Clear the DTC for the radar unit using the M-MDS.
•  Drive the vehicle at 40 km/h (25 mph) or more for 3 min or more.
•  Retrieve the radar unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION.)
No
Go to the next step.
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear the DTC for the radar unit using the M-MDS.
•  Retrieve the radar unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the radar unit, then go to the next step.
(See RADAR UNIT REMOVAL/INSTALLATION.)
No
Go to the next step.
6
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [RADAR UNIT].)
No
DTC troubleshooting completed.