DTC Diagnosis Procedure
The BCM monitors the condition of the door key cylinder switch circuit and translates as the LOCK or UNLOCK signal.
- CHECK DOOR KEY CYLINDER SWITCH
With CONSULT
Check front door lock assembly LH (key cylinder switch), back door lock assembly (key cylinder switch), and sliding door lock assembly (key cylinder switch) functionality individually by monitoring the KEY CYL LK-SW and KEY CYL UN-SW in DATA MONITOR mode with CONSULT.
- When key inserted in key cylinder is turned to LOCK:
KEY CYL LK-SW
: ON
- When key inserted in key cylinder is turned to UNLOCK:
KEY CYL UN-SW
: ON
Without CONSULT
Check voltage between BCM connector terminals 7, 8 and ground. Check each key cylinder switch individually.
Connector
Terminals
Condition of left front key cylinder
Voltage (V)
(Approx.)
(+)
(-)
M18
7
Ground
Neutral/Lock
5
Unlock
0
8
Neutral/Unlock
5
Lock
0
Is the inspection result normal?
YES
Key cylinder switch signal is OK.
NO
GO TO 2
- CHECK DOOR KEY CYLINDER SWITCH GROUND HARNESS
- Turn ignition switch OFF.
- Disconnect suspect door lock assembly (key cylinder switch).
- With sliding door in the closed position, check continuity between door lock assembly (key cylinder switch) connector D14, D609, D303 terminals 4, 3, 3 and body ground.
Connector
Terminals
Continuity
D14
4 - Ground
Yes
D609
3 - Ground
Yes
D303
3 - Ground
Yes
Is the inspection result normal?
YES
GO TO 3
NO
Repair or replace harness.
- CHECK DOOR KEY CYLINDER SWITCH
Check continuity between suspect door lock assembly (key cylinder switch) terminals.
Connector
Terminals
Condition
Continuity
D14
5 - 4
Key is turned to UNLOCK.
Yes
Key is turned to LOCK or neutral.
No
6 - 4
Key is turned to LOCK.
Yes
Key is turned to UNLOCK or neutral.
No
D609
2 - 3
Key is turned to UNLOCK.
Yes
Key is turned to LOCK or neutral.
No
4 - 3
Key is turned to LOCK.
Yes
Key is turned to UNLOCK or neutral.
No
D303
4 - 3
Key is turned to UNLOCK.
Yes
Key is turned to LOCK or neutral.
No
2 - 3
Key is turned to LOCK.
Yes
Key is turned to UNLOCK or neutral.
No
Is the inspection result normal?
YES
GO TO 4
NO
Replace malfunctioning door lock assembly (key cylinder switch). Refer to Removal and Installation (front LH), Removal and Installation (sliding) or Removal and Installation (back).
- CHECK DOOR KEY CYLINDER HARNESS
- Disconnect BCM connector.
- Check continuity between BCM connector M18 terminals 7, 8 and suspect door lock assembly (key cylinder switch) connector D14, D609, D303 terminals 5, 6, 2, 4, 4, 2 and body ground.
Connector
Terminals
Connector
Terminals
Continuity
M18
7
D14
5
Yes
8
6
7
D609
2
8
4
7
D303
8
2
7, 8
Ground
No
Is the inspection result normal?
YES
Replace BCM. Refer to Removal and Installation .
NO
Repair or replace harness.