Diagnosis Procedure
Regarding Wiring Diagram information, refer to [POWER DOOR LOCK SYSTEM: WIRING DIAGRAM [CREW CAB]
].
DIAGNOSIS PROCEDURE
| Step |
Action |
YES |
NO |
| 1 |
CHECK DOOR SWITCHES INPUT SIGNAL
With SDT
Check door switches ("DOOR SW-DR", "DOOR SW-AS", "DOOR SW-RL", "DOOR SW-RR") in "Data list" mode with SDT. Refer to
[SDT FUNCTION (BCM - DOOR LOCK) ].
- When any doors are open:
DOOR SW-DR: ON
DOOR SW-AS: ON
DOOR SW-RL: ON
DOOR SW-RR: ON
- When any doors are closed:
DOOR SW-DR: OFF
DOOR SW-AS: OFF
DOOR SW-RL: OFF
DOOR SW-RR: OFF
Without SDT
Check voltage between BCM connector M18 or M19 terminals 12, 13, 47, 48 and ground.
Is the inspection result normal? |
Door switch circuit is OK. |
GO TO 2 |
| 2 |
CHECK BCM OUTPUT VOLTAGE
- Turn ignition switch OFF.
- Disconnect door switches.
- Check voltage between BCM connector M18, M19 terminals 12, 13, 47, 48 and ground.
 Courtesy of SUZUKI OF AMERICA CORP.
12 - Ground: Battery voltage
13 - Ground: Battery voltage
47 - Ground: Battery voltage
48 - Ground: Battery voltage
Is the inspection result normal? |
GO TO 3 |
Replace BCM. Refer to
[BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION
] |
| 3 |
CHECK DOOR SWITCH CIRCUIT
- Disconnect door switch and BCM.
- Check continuity between door switch connector B8 (Front LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal 2 and BCM connector M18, M19 terminals 12, 13, 47 and 48.
2 - 47: Continuity should exist.
2 - 12: Continuity should exist.
2 - 48: Continuity should exist.
2 - 13: Continuity should exist.
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- 3. Check continuity between door switch connector B8 (Front LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal 2 and ground.
2 - Ground: Continuity should not exist.
Is the inspection result normal? |
GO TO 4 |
Repair or replace harness. |
| 4 |
CHECK DOOR SWITCHES
- Disconnect door switch.
- Check continuity between door switch terminals.
  Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
Is the inspection result normal? |
Check switch case ground condition. |
Replace door switch. |