DTC C1A67:92 [RADAR UNIT]

id1502a6018300

Description

Radar unit sensitivity lowered

Detection condition

•  Radar unit sensitivity decreases.

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

•  Inhibits the cruising & traffic support (CTS).

Possible cause

•  Dirt, snow, or thick moisture film (such as condensation) is adhering to surface of radar unit or radiator grille ornament

•  Reflective object is adhering to radar unit surface and the area around it

•  Radar unit malfunction

System wiring diagram

Not applicable

Description	Radar unit sensitivity lowered
Detection condition	• Radar unit sensitivity decreases.
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 • Inhibits the cruising & traffic support (CTS).
Possible cause	• Dirt, snow, or thick moisture film (such as condensation) is adhering to surface of radar unit or radiator grille ornament • Reflective object is adhering to radar unit surface and the area around it • Radar unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY AREA AROUND RADIATOR GRILLE ORNAMENT

•  Visually inspect the area around the radiator grille ornament for the following:

―  Dirt

―  Adhering foreign matter (reflective object)

•  Is there any dirt, foreign matter (reflective object) or damage, or are there any scratches around the radiator grille?

Yes

Return the surfaces of the radiator grille ornament to their normal condition, then go to Step 5.

No

Go to the next step.

2

VERIFY AREA AROUND RADAR UNIT

•  Remove front bumper.
(See FRONT BUMPER REMOVAL/INSTALLATION.)

•  Visually inspect the area around the radar unit for the following:

―  Dirt

•  Is there any dirt, foreign matter (reflective object) or damage, or are there any scratches around the radar unit?

Yes

Return the radar unit to their normal condition, then go to Step 5.

No

Vehicles with distance recognition support system (DRSS):

•  Go to Step 4.

Vehicles without distance recognition support system (DRSS):

•  Go to the next step.

3

VERIFY CENTER DISPLAY

•  Verify if "SBS/MRCC radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." is displayed in the center display.

•  Is "SBS/MRCC radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." displayed?

Yes

Clean the radar unit, then go to Step 5.

(See RADAR UNIT REMOVAL/INSTALLATION.)

No

Go to Step 5.

4

VERIFY CENTER DISPLAY

•  Verify if "SBS/MRCC/DRSS radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." is displayed in the center display.

•  Is "SBS/MRCC/DRSS radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." displayed?

Yes

Clean the radar unit, then go to the next step.

(See RADAR UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the removed parts.

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

•  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.
(See DTC INSPECTION [RADAR UNIT].)

•  Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

•  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 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.

Step	Inspection		Action
1	VERIFY AREA AROUND RADIATOR GRILLE ORNAMENT • Visually inspect the area around the radiator grille ornament for the following: ― Dirt ― Adhering foreign matter (reflective object) • Is there any dirt, foreign matter (reflective object) or damage, or are there any scratches around the radiator grille?	Yes	Return the surfaces of the radiator grille ornament to their normal condition, then go to Step 5.
1		No	Go to the next step.
2	VERIFY AREA AROUND RADAR UNIT • Remove front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION.) • Visually inspect the area around the radar unit for the following: ― Dirt • Is there any dirt, foreign matter (reflective object) or damage, or are there any scratches around the radar unit?	Yes	Return the radar unit to their normal condition, then go to Step 5.
2		No	Vehicles with distance recognition support system (DRSS): • Go to Step 4. Vehicles without distance recognition support system (DRSS): • Go to the next step.
3	VERIFY CENTER DISPLAY • Verify if "SBS/MRCC radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." is displayed in the center display. • Is "SBS/MRCC radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." displayed?	Yes	Clean the radar unit, then go to Step 5. (See RADAR UNIT REMOVAL/INSTALLATION.)
3		No	Go to Step 5.
4	VERIFY CENTER DISPLAY • Verify if "SBS/MRCC/DRSS radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." is displayed in the center display. • Is "SBS/MRCC/DRSS radar (sensor) malfunction. Clean the entire surface of the front grill emblem if dirty or covered with snow." displayed?	Yes	Clean the radar unit, then go to the next step. (See RADAR UNIT REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the removed parts. • Clear the DTC for the radar unit using the M-MDS. (See CLEARING DTC [RADAR UNIT].) • 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. (See DTC INSPECTION [RADAR UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • 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 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].)
6		No	DTC troubleshooting completed.