DTC U0316:09 [RADAR UNIT]


id1502a6018900

Description

Error signal received from ABS HU/CM or DSC HU/CM

Detection condition
•  The radar unit detects the following conditions.
―  There is an error in the following signals sent from the ABS HU/CM or DSC HU/CM.
•  Yaw rate signal
•  Lateral-G signal
•  Wheel speed signal
•  Brake fluid pressure signal
•  Cruise control system control signal
•  Signal error in brake light circuit
―  ABS HU/CM or DSC HU/CM internal malfunction
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*1
Possible cause
•  DTCs are stored in the SAS control module.
―  SAS control module malfunction
•  DTCs are stored in the ABS HU/CM or DSC HU/CM.
•  DTCs are stored in the rear body control module (RBCM).
―  Rear body control module (RBCM) malfunction
•  ABS HU/CM or DSC HU/CM malfunction
•  Radar unit malfunction
System wiring diagram
Not applicable

*1  :Enabled depending on malfunction content.

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.
No
Go to the next step.
2
VERIFY ABS HU/CM OR DSC HU/CM DTCs
•  Retrieve the ABS HU/CM or 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.
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.
No
Go to the next step.
4
VERIFY IF MALFUNCTIONING LOCATION IS ABS HU/CM OR 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 ABS HU/CM or DSC HU/CM, then go to the next step.
No
Go to the next step.
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  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 radar unit, then go to the next step.
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.
No
DTC troubleshooting completed.