Buick Regal: DTC B302A
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DTC B302A
Mobile Telephone Communications Interface Requested Immobilization
For symptom byte information, refer to Symptom Byte List.
Circuit/System Description
As part of the vehicle telematics enhanced services, a request may be sent to
the body control module
(BCM) to disable vehicle starting. If a valid message is received by the BCM
requesting that starting be
disabled, the start enable message will not be sent to the engine control module
(ECM).
Conditions for Running the DTC
The BCM continuously monitors for this DTC.
Conditions for Setting the DTC
A start disable message has been received from the telematics module.
Action Taken When the DTC Sets
Vehicle starting will be suspended and the security indicator will be
illuminated.
Conditions for Clearing the DTC
- A current DTC will clear when the telematics start disable request is no
longer received.
- A history DTC will clear after 100 ignition cycles in which the
telematic start disable request is
not seen.
Diagnostic Aids
- DTC B302A is only an indicator that a start disable request has been
received from the vehicle
telematics system and does not indicate a fault in the immobilizer or
telematics system.
- To remove the start disable request, the vehicle account must be updated
with the OnStar stolen
vehicle team. This will require that a law enforcement agency or the
customer contact OnStar to
indicate that the vehicle has been successfully and safely recovered.
- If the OnStar system has been disabled or damage during a theft attempt,
the system will not be
able to communicate and the start disable request will not be removed.
OnStar must be
functioning properly for the start disable request to be removed.
Reference Information
Schematic Reference
Immobilizer Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEW INDEX
Master Electrical Component List
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Verify the OnStar system is not damaged and is operating properly, with no
DTCs set.
- If the OnStar system is damaged, inoperative, or any OnStar DTCs are
set
These concerns must be corrected before the start disable can be removed.
- Go to next step: If the OnStar system is not damaged and is operating
properly
2. Press the blue OnStar button and ask the advisor to be transferred to the
stolen vehicle team to
verify the vehicle account has been updated.
3. Verify that OnStar is aware the vehicle has been recovered and that the
vehicle account has been
updated.
- If OnStar has not been notified that the vehicle has been recovered
Contact the customer and advise them that for security purposes, they
must contact OnStar
and the law enforcement agency to update the vehicle account.
- Go to next step: If the account has been properly updated
4. Once the vehicle account has been updated and the start disable request
has been removed, DTC
B302A will transition to a history DTC. Clear the history DTC.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
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Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis: Refer to Strategy
Based Diagnosis
An overview of each diagnostic category can be found here: R