NO.1 ANY OF THE FOLLOWING LIGHTS ARE NOT ILLUMINATED WITH THE IGNITION SWITCHED ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND/OR DSC OFF INDICATOR LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]

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2014 - Mazda6 - Brakes

NO.1 ANY OF THE FOLLOWING LIGHTS ARE NOT ILLUMINATED WITH THE IGNITION SWITCHED ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND/OR DSC OFF INDICATOR LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]


1	Any of the following lights are not illuminated with the ignition switched ON: (ABS warning light, brake system warning light, TCS/DSC indicator light and/or DSC OFF indicator light)
POSSIBLE CAUSE	DSC HU/CM does not operate. Communication error between DSC HU/CM and instrument cluster Instrument cluster malfunction DSC HU/CM internal malfunction

Diagnostic procedure


STEP	INSPECTION		ACTION
1	VERIFY IF MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHTS’ COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS Connect the M-MDS (IDS) to the DLC-2. Turn on all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) Are other warning and indicator lights illuminated?	Yes	Go to Step 5.
1		No	If communication error message is displayed on the M-MDS (IDS) screen: Go to the next step. If communication error message is not displayed: Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
2	INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE Inspect the instrument cluster ignition power supply fuse. Is the fuse normal?	Yes	Go to the next step.
2		No	Inspect the blown fuse’s circuit for a short to ground. Repair or replace the wiring harness for a possible short to ground if necessary. Install appropriate amperage fuse.
^*3	VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER FOR CONTINUITY) OR ELSEWHERE Switch the ignition ON. Measure the voltage at instrument cluster terminal 2S (wiring harness-side). Is the voltage approx. 12 V?	Yes	Go to the next step.
^*3		No	Refer to the wiring diagram and verify whether or not there is a common connector between instrument cluster terminal 2S (wiring harness-side) and ignition switch. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit.
^*4	VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN INSTRUMENT CLUSTER AND GROUND FOR CONTINUITY) OR INSTRUMENT CLUSTER Switch the ignition off. Disconnect the instrument cluster connector. Inspect for continuity between instrument cluster terminal 2K (wiring harness-side) and body ground. Is there continuity?	Yes	Replace the instrument cluster. (Open circuit in the instrument cluster) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
^*4		No	Repair or replace the wiring harness for a possible open circuit and poor contact at ground point.
5	CONFIRM DSC HU/CM DTC Retrieve the DSC HU/CM DTC using the M-MDS (IDS). (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)].)
5		No	If a communication error message is displayed on the M-MDS (IDS) screen: Go to the next step. If a communication error message is not displayed: Go to Step 9.
6	INSPECT DSC HU/CM POWER SUPPLY FUSE Inspect the DSC HU/CM ignition power supply fuse. Is the fuse normal?	Yes	Go to the next step.
6		No	Inspect the blown fuse’s circuit for a short to ground. Repair or replace the wiring harness for a possible short to ground if necessary. Install appropriate amperage fuse.
^*7	VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN DSC HU/CM POWER SUPPLY AND DSC HU/CM FOR CONTINUITY) OR ELSEWHERE Switch the ignition ON. Measure the voltage at the DSC HU/CM terminal Q (wiring harness-side). Is the voltage approx. 12 V?	Yes	Go to the next step.
^*7		No	Inspect for an open circuit between the DSC HU/CM and ignition. Repair or replace the wiring harness for a possible open circuit if necessary.
^*8	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN DSC HU/CM AND GROUND FOR CONTINUITY) OR ELSEWHERE Switch the ignition off. Disconnect the DSC HU/CM connector. Inspect for continuity between DSC HU/CM terminal AL (wiring harness-side) and body ground. Is there continuity?	Yes	Replace the DSC HU/CM. (Open circuit in the DSC HU/CM) (See DSC HU/CM REMOVAL/INSTALLATION.)
^*8		No	Repair or replace the wiring harness for a possible open circuit and poor contact at ground point.
9	CONFIRM INSTRUMENT CLUSTER DTC Retrieve the instrument cluster DTC using the M-MDS (IDS). (See DTC INSPECTION [INSTRUMENT CLUSTER].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
9		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that connectors, terminals and wiring harnesses are connected correctly and undamaged.

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