Rolling Code Failure; Vin Mismatch - DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual

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 ECM due to a SKIM or ECM 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 ECM.
VIN MISMATCH
When Monitored: With the ignition on.
Set Condition: When the VIN received from the ECM does not match the VIN stored in
the SKIM's EEPROM.
VERIFYING ECM VIN
REPLACE SKIM AND CHECK DTC'S
INTERMITTENT WIRING HARNESS PROBLEM
ECM
TEST
1 With the DRBIII , erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the DRBIII , read the SKIM DTCs.
Does the DRBIII display the DTC that was previously erased?
Yes → Go To 2
→ Go To 4
No
SENTRY KEY IMMOBILIZER
POSSIBLE CAUSES
ACTION
245
APPLICABILITY
All