Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B197D >> Circuit/System Description

Circuit/System Description

The Restraints Control Module sends the BCM a message telling the BCM that the correct Restraints Control Module is present. The message is sent and verified on every cycle of the key. If the BCM receives an incorrect response or no response at all, vehicle starting is disabled.

scientia non olet · About Mike's Workshop Manuals