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.

   ASCD brake switch		Ground	Voltage
   Connector	Terminal
   E36	1	Ground	Battery voltage

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Perform the trouble diagnosis for power supply circuit.

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

   ASCD brake switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E36	2	E16	100	Existed

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

   Is the inspection result normal? 

   YES: GO TO 3.

   NO: Repair or replace error-detected parts.

Check the 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 ".