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EC-386 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] P1572 ASCD BRAKE SWITCH Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident" . NO >> GO TO 6. 3. CHECK ASCD BRAKE SWITCH POWER SUPPLY 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. Is the inspection result normal? YES >> GO TO 4. NO >> Perform the trouble diagnosis for power supply circuit. 4. CHECK ASCD BRAKE SWITCH INPUT SIGNAL 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. 4. Also check harness for short to ground and to power. YES >> GO TO 5. NO >> Repair or replace error-detected parts. 5. CHECK ASCD BRAKE SWITCH Check the ASCD brake switch. Refer to EC-426, "Component Inspection (ASCD Brake Switch)" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident" . NO >> Replace ASCD brake switch. Refer to . 6. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector. 3. Check the voltage between stop lamp switch harness connector and ground. Is the inspection result normal? YES >> GO TO 7. NO >> Perform the trouble diagnosis for power supply circuit. ECM Condition Voltage (Approx.) Connector + – Terminal E16 99 108 Brake pedal Slightly depressed Battery voltage Fully released 0 V ASCD brake switch Ground Voltage Connector Terminal E36 1 Ground Battery voltage ASCD brake switch ECM Continuity Connector Terminal Connector Terminal E36 2 E16 100 Existed Stop lamp switch Ground Voltage Connector Terminal E13 1 Ground Battery voltage |