DTC C1A96:62 [RADAR UNIT]

id1502a6018500

Description

Brake switch malfunction

Detection condition

•  The radar unit detects that the brake switch signal and the brake fluid pressure value are incompatible.

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

•  Brake switch malfunction

•  DTCs are stored in the PCM.

―  Malfunction in circuit between brake switch and PCM

―  PCM malfunction

•  DTCs are stored in the ABS HU/CM or DSC HU/CM.

―  ABS HU/CM or DSC HU/CM malfunction

•  Radar unit malfunction

System wiring diagram

Not applicable

Description	Brake switch malfunction
Detection condition	• The radar unit detects that the brake switch signal and the brake fluid pressure value are incompatible.
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	• Brake switch malfunction • DTCs are stored in the PCM. ― Malfunction in circuit between brake switch and PCM ― PCM malfunction • DTCs are stored in the ABS HU/CM or DSC HU/CM. ― ABS HU/CM or DSC HU/CM malfunction • Radar unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT BRAKE SWITCH

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

•  Is it brake switch normal?

Yes

Go to the next step.

No

Replace the brake switch, then go to the Step 4.

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

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

2

VERIFY PCM DTCs

•  Retrieve the PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].)

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

•  Are any DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

(See DTC TABLE [PCM (SKYACTIV-D 1.5)].)

(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)

(See DTC TABLE [MZR 1.6].)

No

Go to the next step.

3

VERIFY ABS HU/CM OR DSC HU/CM DTCs

•  Retrieve the ABS HU/CM or DSC HU/CM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

•  Are any DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

No

Go to the next step.

4

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  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.

5

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	INSPECT BRAKE SWITCH • Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) • Is it brake switch normal?	Yes	Go to the next step.
1		No	Replace the brake switch, then go to the Step 4. (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].) (See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
2	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) (See DTC TABLE [PCM (SKYACTIV-D 1.5)].) (See DTC TABLE [PCM (SKYACTIV-D 2.2)].) (See DTC TABLE [MZR 1.6].)
2		No	Go to the next step.
3	VERIFY ABS HU/CM OR DSC HU/CM DTCs • Retrieve the ABS HU/CM or DSC HU/CM DTCs using the M-MDS. (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
3		No	Go to the next step.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • 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.
4		No	Go to the next step.
5	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].)
5		No	DTC troubleshooting completed.