Step
| Action
| Value(s)
| Yes
| No
|
DEFINITION: The door key cylinder unlock feature is inoperative when
unlocking doors using the door key cylinder.
|
1
| Was the Body Control Module Diagnostic System Check performed?
| --
| Go to
Step 2
| Go to
Diagnostic System Check - Body Control System
in Body Control System
|
2
|
- Disconnect the inoperative key cylinder lock switch electrical
connector.
- Connect a test lamp between B+ and the key cylinder lock switch
harness connector terminal C.
Does the test lamp light?
| --
| Go to
Step 3
| Go to
Step 5
|
3
|
- Turn the ignition switch to the LOCK position.
- Disconnect the BCM connector C2.
- Use a J 39200
digital multimeter (DMM) in order to measure the resistance between the
key cylinder lock switch harness connector terminal D (terminal B
when checking the liftgate lock) and the BCM harness connector C2
terminal C5.
Is the resistance less than the specified value?
| 10ohms
| Go to
Step 4
| Go to
Step 6
|
4
|
- Insert a key in the inoperative door cylinder lock. Rotate the
lock to the unlock position.
- Use a J 39200
DMM in order to measure the resistance between the door lock cylinder switch
connector terminal C and terminal D (terminals B and
C when checking the liftgate lock cylinder).
Is the resistance less than the specified value?
| 2ohms
| Go to
Step 7
| Go to
Step 8
|
5
| Repair the poor connection or the open in CKT 750.
Is the repair complete?
| --
| Go to
Step 9
| --
|
6
| Repair the poor connection or the open in CKT 781.
Is the repair complete?
| --
| Go to
Step 9
| --
|
7
|
- Inspect the BCM connector C2 terminal C5 for poor
terminal contact.
- If the BCM connector C2 terminal C5 is OK, replace
the BCM. Refer to
Body Control Module Replacement
in Body Systems
Is the repair complete?
| --
| Go to
Step 9
| --
|
8
| Replace the key cylinder lock switch. Refer to
Door Lock Cylinder Replacement
or
Lock Cylinder Replacement - Sliding Door
.
Is the repair complete?
| --
| Go to
Step 9
| --
|
9
|
- Turn the ignition switch to the LOCK position.
- Re-install the connectors/components that were removed.
- Turn the ignition switch to the RUN position for 6 seconds.
- Turn the ignition switch to the LOCK position.
- Remove the BCM PRGRM fuse.
- Turn the ignition switch to the ACC position. (The BCM sounds
the chime a number of times equivalent to the BCM type installed on the vehicle).
- Turn the ignition switch from the ACC position, to the LOCK position
and back to the ACC position within 1 second. (The BCM sounds any
DTCs stored).
Are there any BCM DTCs present?
| --
| Go to
Diagnostic System Check - Body Control System
in
Body Control System
| Go to
Automatic Door Locks System Check
|
