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EC-402 < COMPONENT DIAGNOSIS > [VQ35HR] P1572 ASCD BRAKE SWITCH P1572 ASCD BRAKE SWITCH Description INFOID:0000000000956804 When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. for the ASCD function. DTC Logic INFOID:0000000000956805 DTC DETECTION LOGIC NOTE: • This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed. DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A With CONSULT-III 1. Start engine (VDC switch OFF). 2. Select “DATA MONITOR” mode with CONSULT-III. 3. Press MAIN switch and make sure that CRUISE lamp lights up. 4. Drive the vehicle for at least 5 consecutive seconds under the following conditions. CAUTION: Always drive vehicle at a safe speed. 5. Check 1st trip DTC. With GST DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1572 ASCD brake switch A) When the vehicle speed is above 30 km/h • Harness or connectors (The stop lamp switch circuit is shorted.) • Harness or connectors (The ASCD brake switch circuit is shorted.) • Stop lamp switch B) ASCD brake switch signal is not sent to VHCL SPEED SE More than 30 km/h (19 mph) Selector lever Suitable position |