NO.2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]

id0403b2804600

2

Any of the following lights remain on: (ABS warning light, BRAKE system warning light, DSC indicator light and/or DSC OFF light)

Possible cause

•  Brake fluid amount is low. •  Parking brake is not released. •  Parking brake switch or brake fluid level sensor stuck on. •  No connection at DSC CM connector (When DSC CM connector goes out, ABS warning light and BRAKE system warning light illuminate.) •  DSC CM detected malfunction (input and output device malfunction). •  DSC CM detects low voltage in power supply circuit. •  DSC CM GND malfunction (When DSC CM GND is not securely connected, ABS warning light and BRAKE system warning light illuminate but no DTC is displayed.) •  DSC CM does not operate (DSC CM malfunction). •  Improper brake switch signal input to PCM (PCM stores DTC P0571:00 and/or P0703:00.) (MZR 1.3, MZR 1.5 without malfunction warning light)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT PARKING BRAKE RELEASES •  Is the brake fluid amount normal? •  Is the parking brake lever released?	Yes	MZR 1.3, MZR 1.5 with malfunction warning light Go to step 3. MZR 1.3, MZR 1.5 without malfunction warning light Go to the next step. MZ-CD 1.6 Go to step 3.
		No	Add brake fluid or release the parking brake lever.
2	INSPECT PCM DTC •  Retrieve the PCM DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) •  Is the DTC P0571:00 and/or P0703:00 present?	Yes	Go to the applicable DTC inspection. (See DTC P0571:00 [MZR 1.3, MZR 1.5].) (See DTC P0703:00 [MZR 1.3, MZR 1.5].)
		No	Go to the next step.
3	INSPECT FOR DTCS IN DSC •  Retrieve DSC DTC using the M-MDS. •  Is there any DSC DTC displayed?	Yes	Go to applicable DTC troubleshooting procedure. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
		No	Go to the next step.
4	INSPECT DTCS IN INSTRUMENT CLUSTER •  Retrieve instrument cluster DTC using the M-MDS. •  Is DTC U0415:92 displayed?	Yes	Go to the next step.
		No	Go to Step 7.
5*	INSPECT DSC CM POWER SUPPLY VOLTAGE •  Monitor PID VPWR using the M-MDS data monitor function. •  Is the monitoring value above 10 V?	Yes	DSC CM internal malfunctions. Replace the DSC CM. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
		No	Go to the next step.
6	INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE •  Release the parking brake. •  Turn off all warning light and indicator light using M-MDS simulation function WL+IL? (See ACTIVE COMMAND MODES TABLE [INSTRUMENT CLUSTER].) •  Does the DSC warning light turn off?	Yes	Go to the next step.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
7	INSPECT FOR CONNECTION OF DSC HU/CM CONNECTOR •  Is the DSC HU/CM connector connected securely?	Yes	Go to Step 9.
		No	Connect the connector securely, then go to the next step.
8	VERIFY DSC WARNING LIGHT OPERATION •  Turn the ignition switch to ON position. •  Does the DSC warning light turn off 4 seconds after the ignition switch is ON position?	Yes	Troubleshooting is completed. (DSC HU/CM connector is not connected securely.)
		No	Go to the next step.
9	INSPECT BATTERY VOLTAGE •  Inspect battery voltage. •  Is the battery voltage normal?	Yes	Go to the next step.
		No	Inspect charging system. Replace the battery if necessary.
10	INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING •  Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating. •  Is the battery voltage normal?	Yes	Inspect wiring harness in DSC HU/CM terminal Y and terminal B related circuit.
		No	Go to the next step.
11	INSPECT CHARGING SYSTEM •  Inspect the battery voltage normal with electrical load (such as, A/C headlight) on the engine idling?	Yes	Go to the next step.
		No	Inspect the charging system (such as drive belt tension, generator). (See GENERATOR INSPECTION [MZR 1.3, MZR 1.5].) (See GENERATOR INSPECTION [MZ-CD 1.6].)
12	INSPECT WTHERE MALFUNCTION IS IN BRAKE SYSTEM WARNING LIGHT RELATED SWITCHES OR ELSE WHERE •  Inspect following parts for continuity. ―  Parking brake switch (See PARKING BRAKE SWITCH INSPECTION.) ―  Brake fluid level sensor (See BRAKE FLUID LEVEL SENSOR INSPECTION.) •  Is the continuity condition normal?	Yes	Go to the next step.
		No	Repair or replace malfunctioning part. (See PARKING BRAKE LEVER REMOVAL/INSTALLATION [L.H.D.].) (See PARKING BRAKE LEVER REMOVAL/INSTALLATION [R.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
13	INSPECT FOR SHORT TO GND CIRCUIT IN WIRING BETWEEN BCM AND BRAKE SYSTEM WARNING LIGHT RELATED SWITCHES •  Inspect for open circuit in wiring for following: ―  Between parking switch and BCM terminal 7B ―  Between brake fluid level sensor and BCM terminal 4A •  Is the short to GND circuit detected?	Yes	Repair or replace malfunctioning part.
		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)