Diagnosis Procedure

Regarding Wiring Diagram information, refer to [POWER DOOR LOCK SYSTEM: WIRING DIAGRAM [KING CAB] ].

DIAGNOSIS PROCEDURE

Step	Action	YES	NO
1	CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL With SDT Check door lock/unlock switch ("CDL LOCK SW", "CDL UNLOCK SW") in "Data list" mode in SDT. Refer to [SDT FUNCTION (BCM - DOOR LOCK) ]. When door lock/unlock switch is turned to LOCK: CDL LOCK SW: ON When door lock/unlock switch is turned to UNLOCK: CDL UNLOCK SW: ON Without SDT Remove key from ignition key cylinder. Check the signal between BCM connector M18 terminal 22 and ground with oscilloscope when door lock/unlock switch is turned to LOCK or UNLOCK. Make sure the signals which are shown in the figure below can be detected during 10 seconds just after the door lock/unlock switch is turned to LOCK or UNLOCK. Is the inspection result normal?	Door lock and unlock switch circuit is OK.	GO TO 2
2	CHECK BCM OUTPUT SIGNAL Check ("POWER WINDOW DOWN") in "Active test" mode for "MULTI REMOTE ENT" with SDT. Refer to [SDT FUNCTION (BCM - DOOR LOCK) ]. When "Active test" is performed, are the front windows lowered? Is the inspection result normal?	GO TO 3	Replace BCM. Refer to [BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ]
3	CHECK DOOR LOCK/UNLOCK SWITCH GROUND HARNESS Turn ignition switch OFF. Disconnect main power window and door lock/unlock switch or power window and door lock/unlock switch RH. Check continuity between main power window and door lock/unlock switch connector D7 terminal 15 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 15 - Ground: Continuity should exist 4. Check continuity between power window and door lock/unlock switch RH connector D105 terminal 11 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 11 - Ground: Continuity should exist Is the inspection result normal?	GO TO 4	Repair or replace harness.
4	CHECK POWER WINDOW SERIAL LINK CIRCUIT Disconnect BCM. Check continuity between BCM connector M18 terminal 22 and main power window and door lock/unlock switch connector D7 terminal 12. 22 - 12: Continuity should exist Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 3. Check continuity between BCM connector M18 terminal 22 and power window and door lock/unlock switch RH connector D105 terminal 16. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 22 - 16: Continuity should exist 4. Check continuity between BCM connector M18 terminal 22 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 22 - Ground: Continuity should not exist Is the inspection result normal?	Replace main power window and door lock/unlock switch or power window and door lock/unlock switch RH.	Repair or replace harness.