Chrysler Town, Dodge Caravan. Manual — part 1175
Symptom List:
ROLLING CODE FAILURE
VIN MISMATCH
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ROLLING CODE FAILURE.
When Monitored and Set Condition:
ROLLING CODE FAILURE
When Monitored:
At ignition on, after ignition on during any rolling code handshake that
occurs with the PCM due to a SKIM or PCM reset.
Set Condition:
When a PCM STATUS message with a Valid Key status is not received by
the SKIM within 3.5 seconds of transmitting the last Valid Key Code message to the PCM.
VIN MISMATCH
When Monitored:
With the ignition on.
Set Condition:
When the VIN received from the PCM does not match the VIN stored in
the SKIM’s EEPROM.
POSSIBLE CAUSES
VERIFYING ECM VIN
REPLACE SKIM AND CHECK DTC’S
INTERMITTENT WIRING HARNESS PROBLEM
ECM
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the DRBIII
t, read the SKIM DTCs.
Does the DRBIII
t display the DTC that was previously erased?
All
Yes
→ Go To 2
No
→ Go To 4
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TEST
ACTION
APPLICABILITY
2
Turn the ignition on.
With the DRBIII
t, select Engine system from the main menu.
Display and record the Vehicle Identification Number.
NOTE: Ensure that the correct VIN has been programmed into the ECM. If
a VIN is not displayed, attempt to program the ECM with the correct vehicle
VIN before continuing.
Does the VIN recorded from the ECM match the VIN of the vehicle?
All
Yes
→ Go To 3
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SKIS VERIFICATION.
3
Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the
Service Information.
Turn the ignition on.
With the DRBIII
t, display and clear all ECM and SKIM DTCs.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the DRBIII
t, check for SKIM DTCs.
Does the DRBIII
t display the same DTC?
All
Yes
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SKIS VERIFICATION.
No
→ The repair is complete.
Perform SKIS VERIFICATION.
4
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?
All
Yes
→ Repair wiring harness/connectors as necessary.
Perform SKIS VERIFICATION.
No
→ Test Complete.
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ROLLING CODE FAILURE —
Continued
Symptom:
STACK OVERFLOW FAILURE
When Monitored and Set Condition:
STACK OVERFLOW FAILURE
When Monitored:
With the ignition on.
Set Condition:
The micro controller has exceeded its stack space limit.
TEST
ACTION
APPLICABILITY
1
Reconnect all previously disconnected components and connectors.
Obtain the vehicle’s unique Personal Identification Number (PIN) assigned to its
original SKIM. This number can be obtained from the vehicle’s invoice.
NOTE: When entering the PIN, care should be taken because the SKIM will
only allow 3 consecutive attempts to enter the correct PIN. If 3 consecutive
incorrect PINs are entered, the SKIM will Lock Out the DRBIII
t for 1 hour.
To exit Lock Out mode, the ignition key must remain in the Run position continually
for 1 hour. Turn off all accessories and connect a battery charger if necessary.
With the DRBIII
t, select Theft Alarm, SKIM and Miscellaneous. Then select desired
procedure and follow the steps that will be displayed.
If the SKIM has been replaced, ensure all of the vehicle ignition keys are pro-
grammed to the new SKIM.
NOTE: Prior to returning vehicle to the customer, perform a module scan to
be sure that all DTCs are erased. Erase any DTCs that are found.
With the DRBIII
t erase all DTCs. Perform 5 ignition key cycles leaving the key on for
at least 90 seconds per cycle.
With the DRBIII
t, read the SKIM DTCs.
Are there any SKIM DTCs?
All
Yes
→ Test Complete.
No
→ Test Complete.
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Symptom List:
TRANSPONDER COMMUNICATION FAILURE
TRANSPONDER CYCLIC REDUNDANCY CHECK (CRC) FAILURE
TRANSPONDER ID MISMATCH
TRANSPONDER RESPONSE MISMATCH
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be TRANSPONDER COMMUNICA-
TION FAILURE.
When Monitored and Set Condition:
TRANSPONDER COMMUNICATION FAILURE
When Monitored:
At ignition on and during Key Programming Mode.
Set Condition:
When the SKIM does not receive a transponder response after 8 consec-
utive transponder read attempts within 2.0 seconds.
TRANSPONDER CYCLIC REDUNDANCY CHECK (CRC) FAILURE
When Monitored:
At ignition on and during Key Programming Mode.
Set Condition:
When 5 consecutive transponder signal transmissions are sent to the
SKIM with the correct message format but with invalid data.
TRANSPONDER ID MISMATCH
When Monitored:
At ignition on and during Key Programming Mode.
Set Condition:
When the transponder ID read by the SKIM does not match any of the
transponder ID’s stored in the SKIM’s memory.
TRANSPONDER RESPONSE MISMATCH
When Monitored:
At ignition on and during Key Programming Mode.
Set Condition:
When the transponder’s crypto algorithm result fails to match the SKIM’s
result due to incorrect secret key in the ignition key transponder.
POSSIBLE CAUSES
CHECKING MULTIPLE KEY OPERATION
SKIM
INTERMITTENT WIRING HARNESS PROBLEM
REPLACE IGNITION KEY
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