Diagnosis Procedure

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

1. CHECK WARNING ON INDICATOR POWER SUPPLY CIRCUIT
   
   
   1. Turn ignition switch OFF.
   2. Disconnect warning systems switch connector.
   3. Turn ignition switch ON.
   4. Check voltage between warning systems switch harness connector and ground.

      Terminals			Voltage (Approx.)
      (+)		(-)
      Warning systems switch		Ground
      Connector	Terminal
      M126	5		Battery voltage

   Is the inspection result normal?

   YES 

   GO TO STEP 2  .

   NO 

   Repair the warning systems ON indicator power supply circuit.

2. CHECK WARNING SYSTEMS ON INDICATOR SIGNAL FOR OPEN
   
   
   1. Turn ignition switch OFF.
   2. Disconnect the ADAS control unit harness connector.
   3. Check continuity between the ADAS control unit harness connector and warning systems switch harness connector.

   ADAS control unit		Warning systems switch		Continuity
   Connector	Terminal	Connector	Terminal
   B104	4	M126	3	Yes

   Is the inspection result normal?

   YES 

   GO TO STEP 3  .

   NO 

   Repair the harnesses or connectors.

3. CHECK WARNING SYSTEMS ON INDICATOR SIGNAL CIRCUIT FOR SHORT
   
   

   Check continuity between the ADAS control unit harness connector and ground.

   ADAS control unit		Ground	Continuity
   Connector	Terminal
   B104	4		No

   Is the inspection result normal?

   YES 

   GO TO STEP 4  .

   NO 

   Repair the harnesses or connectors.

4. CHECK WARNING SYSTEMS ON INDICATOR
   
   

   Check the warning systems ON indicator. Refer to COMPONENT INSPECTION .

   Is the inspection result normal?

   YES 

   Replace the ADAS control unit. Refer to REMOVAL AND INSTALLATION .

   NO 

   Replace warning systems switch. Refer to REMOVAL AND INSTALLATION .