Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness connector and ground.
   TERMINAL CONTINUITY REFERENCE CHART
   
   

   ASCD brake switch		Ground	Voltage
   Connector	Terminal
   E109	1	Ground	Battery voltage

   Is the inspection result normal? 

   YES: GO TO  3.

   NO: GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect fuse block (J/B) harness connector.
3. Check the continuity between ASCD brake switch harness connector and fuse block (J/B) harness connector.
   TERMINAL CONTINUITY REFERENCE CHART
   
   

   ASCD brake switch		Fuse block (J/B)		Continuity
   Connector	Terminal	Connector	Terminal
   E109	1	E103	4F	Existed

   Is the inspection result normal? 

   YES: Perform the trouble diagnosis for power supply circuit.

   NO: Repair or replace error-detected parts.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.
   TERMINAL CONTINUITY REFERENCE CHART
   
   

   ASCD brake switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E109	2	E16	126	Existed

4. Also check harness for short to ground and short to power.

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Repair open circuit, short to ground or short to power in harness or connectors.

Check ASCD brake switch. Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) ".

Is the inspection result normal? 

YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

NO: Replace ASCD brake switch. Refer to "EXPLODED VIEW ".