DTC C1105:62 [RADAR UNIT]

id1502a6017700

System malfunction location

Brake light signal malfunction

Detection condition

•  The radar unit detects that the brake switch signal and the brake light on/off are incompatible.

Fail-safe

•  Inhibits the Mazda radar cruise control (MRCC) system control

•  Inhibits the smart brake support (SBS) system control

Possible cause

•  Brake light unit malfunction

•  Malfunction in circuit between brake light unit and rear body control module (RBCM) and rear body control module (RBCM)

•  Brake switch malfunction

•  Signal error in circuit between rear body control module (RBCM) and instrument cluster

•  Signal error in circuit between instrument cluster and radar unit

•  Radar unit malfunction

System wiring diagram

•  Not applicable

System malfunction location	Brake light signal malfunction
Detection condition	• The radar unit detects that the brake switch signal and the brake light on/off are incompatible.
Fail-safe	• Inhibits the Mazda radar cruise control (MRCC) system control • Inhibits the smart brake support (SBS) system control
Possible cause	• Brake light unit malfunction • Malfunction in circuit between brake light unit and rear body control module (RBCM) and rear body control module (RBCM) • Brake switch malfunction • Signal error in circuit between rear body control module (RBCM) and instrument cluster • Signal error in circuit between instrument cluster and radar unit • Radar unit malfunction
System wiring diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

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)].)

Then go to Step 5.

No

Go to the next step.

2

INSPECT BRAKE SWITCH

•  Inspect the brake switch.
(See BRAKE SWITCH INSPECTION.)

•  Is it normal?

Yes

Go to the next step.

No

Replace the brake switch, then go to the Step 5.

(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)

(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)

3

PERFORM DTC INSPECTION FOR INSTRUMENT CLUSTER

•  Perform the instrument cluster DTC inspection using the M-MDS.
(See DTC INSPECTION [INSTRUMENT CLUSTER].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

Then go to Step 5.

No

Go to the next step.

4

PERFORM DTC INSPECTION FOR RADAR UNIT

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

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [RADAR UNIT].)

Then go to the next step.

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).

•  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 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 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)].) Then go to Step 5.
1		No	Go to the next step.
2	INSPECT BRAKE SWITCH • Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) • Is it normal?	Yes	Go to the next step.
2		No	Replace the brake switch, then go to the Step 5. (See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].) (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)
3	PERFORM DTC INSPECTION FOR INSTRUMENT CLUSTER • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].) Then go to Step 5.
3		No	Go to the next step.
4	PERFORM DTC INSPECTION FOR RADAR UNIT • Perform the radar unit DTC inspection using the M-MDS. (See DTC INSPECTION [RADAR UNIT].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [RADAR UNIT].) Then go to the next step.
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). • 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 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.