Symptom:
MISSING CURRENT VIN
When Monitored and Set Condition:
MISSING CURRENT VIN
When Monitored: The first time a new ACM is powered up it monitors the PCI Bus for 2
consecutive identical VIN messages. The complete VIN is then permanently stored into
memory and the 6thdigit is used to identify a light duty (1) or heavy duty (2, 3 or 4) vehicle.
Set Condition: If a ACM does not receive two consecutive identical VIN messages within
5.6 seconds. The active DTC will be cleared once two consecutive identical VIN messages
are received.
POSSIBLE CAUSES
PCM, PCI COMMUNICATION FAILURE
PCM VEHICLE IDENTIFICATION NUMBERS INCORRECT OR MISSING
LOW VOLTAGE TO ACM
ACM CALIBRATION MISMATCH
STORED CODE OR INTERMITTENT CONDITION
ACTIVE CODE PRESENT
TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: Ensure the battery is fully charged.
NOTE: For the purpose of this test, the AECM and ORC modules will be
referred to as an ACM.
SELECT ACTIVE or STORED DTC:
All
ACM - ACTIVE DTC
Go To 2
ACM - STORED DTC
Go To 6
NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.
2 Turn the ignition on.
NOTE: Ensure the battery is fully charged.
Connect the DRB to the data link connector and select PASSIVE RESTRAINTS,
AIRBAG, SYSTEM TEST.
With the DRBIIIt, read the system test.
Does the DRB show PCM Active on the Bus:?
All
Yes → Go To 3
No → Refer to category COMMUNICATION CATEGORY and select the
related symptom.
Perform __AIRBAG VERIFICATION TEST - VER 1.
90
AIRBAG
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