DTC U0316:09 [RADAR UNIT]

id1502a6018900

Description

Error signal received from DSC HU/CM

Detection condition

•  The radar unit detects the following conditions.

―  There is an error in the following signals sent from the 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

―  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

^*1: Enabled depending on malfunction content.

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

Description	Error signal received from DSC HU/CM
Detection condition	• The radar unit detects the following conditions. ― There is an error in the following signals sent from the 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 ― 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 ^1: Enabled depending on malfunction content.
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

PERFORM DTC INSPECTION FOR SAS CONTROL MODULE

•  Perform the SAS control module DTC inspection using the M-MDS.
(See DTC INSPECTION [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].)

(See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].)

(See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)

Go to Step 5.

No

Go to the next step.

2

PERFORM DTC INSPECTION FOR DSC HU/CM

•  Perform the DSC HU/CM DTC inspection using the M-MDS.
(See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)

Go to Step 5.

No

Go to the next step.

3

PERFORM DTC INSPECTION FOR REAR BODY CONTROL MODULE (RBCM)

•  Perform the rear body control module (RBCM) DTC inspection using the M-MDS.
(See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)

Go to Step 5.

No

Go to the next step.

4

VERIFY IF MALFUNCTIONING LOCATION IS DSC HU/CM DEPENDING ON REPEATABILITY

•  Clear radar unit DTCs using the M-MDS.
(See CLEARING DTC [RADAR UNIT].)

•  Switch the ignition ON (engine on).

•  Drive the vehicle at 40 km/h {25 mph} or more for 3 min or more.

•  Perform the radar unit DTC inspection using the M-MDS.
(See DTC INSPECTION [RADAR UNIT].)

•  Is the same Pending DTC present?

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 radar unit DTCs using the M-MDS.
(See CLEARING DTC [RADAR UNIT].)

•  Switch the ignition ON (engine on).

•  Perform the radar unit DTC inspection using the M-MDS.
(See DTC INSPECTION [RADAR UNIT].)

•  Is the same Pending DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction does not recur, go to the next step.

•  If the malfunction recurs, replace the radar unit.
(See RADAR UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

6

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.

•  Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION FOR SAS CONTROL MODULE • Perform the SAS control module DTC inspection using the M-MDS. (See DTC INSPECTION [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].) (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].) (See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Go to Step 5.
1		No	Go to the next step.
2	PERFORM DTC INSPECTION FOR DSC HU/CM • Perform the DSC HU/CM DTC inspection using the M-MDS. (See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].) Go to Step 5.
2		No	Go to the next step.
3	PERFORM DTC INSPECTION FOR REAR BODY CONTROL MODULE (RBCM) • Perform the rear body control module (RBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].) Go to Step 5.
3		No	Go to the next step.
4	VERIFY IF MALFUNCTIONING LOCATION IS DSC HU/CM DEPENDING ON REPEATABILITY • Clear radar unit DTCs using the M-MDS. (See CLEARING DTC [RADAR UNIT].) • Switch the ignition ON (engine on). • Drive the vehicle at 40 km/h {25 mph} or more for 3 min or more. • Perform the radar unit DTC inspection using the M-MDS. (See DTC INSPECTION [RADAR UNIT].) • Is the same Pending DTC present?	Yes	Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear radar unit DTCs using the M-MDS. (See CLEARING DTC [RADAR UNIT].) • Switch the ignition ON (engine on). • Perform the radar unit DTC inspection using the M-MDS. (See DTC INSPECTION [RADAR UNIT].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction does not recur, go to the next step. • If the malfunction recurs, replace the radar unit. (See RADAR UNIT REMOVAL/INSTALLATION.) Go to the next step.
5		No	Go to the next step.
6	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
6		No	DTC troubleshooting completed.