Diagnostic Procedure

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC C1A67:78 (VEHICLE CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY RADIATOR GRILLE Is the radiator on a vehicle with a radar sensor installed?	Yes	Go to the next step.
1		No	Replace the radiator grille on the vehicle with a radar sensor, then go to Step 9.
2	VERIFY AREA AROUND RADIATOR GRILLE ORNAMENT Visually inspect the surface of the radiator grille ornament. Under the following conditions? Dirt is adhering to radiator grille ornament Foreign matter (reflective object) is adhering to radiator grille ornament Radiator grille ornament is scratched or damaged	Yes	Return the surfaces of the radiator grille ornament to their normal condition, then go to Step 9.
2		No	Go to the next step.
3	VERIFY AREA AROUND RADAR SENSOR Remove front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION .) Visually inspect the surface of the radar sensor. Under the following conditions? Dirt is adhering to radar sensor Foreign matter (reflective object) is adhering to radar sensor Radar sensor is scratched or damaged	Yes	Return the radar sensor to their normal condition, then go to Step 9.
3		No	Go to the next step.
4	VERIFY LCD Is the message indicating "FOW, MRCC Radar blocked" displayed in the LCD in the instrument cluster?	Yes	Switch the ignition off (LOCK), leave it for 30 min to cool down the radar sensor, switch the ignition ON (engine off or on) again, and verify the message indicating "FOW, MRCC, Radar blocked" in the LCD. "FOW, MRCC Radar blocked" is not displayed Go to the next step. "FOW, MRCC Radar blocked" is displayed Replace radar sensor, then go to Step 9. (See RADAR SENSOR REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM] .)
4		No	Go to the next step.
5	VERIFY RADAR SENSOR BRACKET Verify that there is no bending or damage on the radar sensor bracket. Is there bending or damage on the radar sensor bracket?	Yes	Go to the next step.
5		No	Replace the radar sensor bracket and perform the aiming adjustment. (See RADAR SENSOR DISASSMBLY/ASSEMBLY [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM] .) (See RADAR SENSOR AIMING [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM] .) Then go to Step 9.
6	PERFORM DTC INSPECTION FOR DSC HU/CM Perform the DSC HU/CM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Then go to Step 9.
6		No	Go to the next step.
7	PERFORM DTC INSPECTION FOR SAS CONTROL MODULE Perform the SAS control module DTC inspection using the M-MDS. (See DTC INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM] .) (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [STANDARD DEPLOYMENT CONTROL SYSTEM] .) (See DTC TABLE [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) Then go to Step 9.
7		No	Go to the next step.
8	PERFORM DTC INSPECTION FOR VEHICLE CONTROL MODULE (V/C-MODULE) Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS. (See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [VEHICLE CONTROL MODULE (V/C-MODULE)] .) Then go to the next step.
8		No	Go to the next step.
9	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear vehicle control module (V/C-module) DTCs using the M-MDS. (See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)] .) Switch the ignition ON (engine on). Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS. (See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)] .) 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 vehicle control module (V/C-module). (See VEHICLE CONTROL MODULE (V/C-MODULE) REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM] .) Go to the next step.
9		No	Go to the next step.
10	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
10		No	DTC troubleshooting completed.