B2973

DTC B2973 Door Key Switch Circuit Low (Envoy Only):

CIRCUIT DESCRIPTION
The Body Control Module (BCM) monitors CKT 262 for the content theft system. The BCM supplies an output to the LF and the RF mini-wedge door jamb switches when the BCM sense the output voltage low by turning the key in the door key switch, it disables the content theft system.

CONDITIONS FOR THE DTC
^ CKT 262 is shorted to ground for more than 184 seconds.
^ The system voltage must be between 9.0 volts and 16.0 volts.
^ The above conditions must be met for 0.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ If the short to ground occurs after the vehicle is secured, the content theft system will be disabled.
^ If the short to ground occurs before the vehicle is secured, the content system will not disable the system by turning the key in the door key switch.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The current DTC will clear immediately after the short to ground is corrected.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ History and current DTCs can be cleared using a scan tool.

DIAGNOSTIC AIDS
^ Always diagnose the first DTC listed on the scan tool.
^ The scan tool must display DTC B2973 as a current code before performing diagnostics.
^ If a self-powered test lamp is not available the same results may be obtained by connecting a test lamp to battery voltage and probing the ground circuit.
^ Perform a visual inspection for loose or poor connections at all related components.
^ Refer to Wiring Systems for intermittent or poor connections.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This determines if the BCM is defective. Disconnecting the BCM connector will set other DTCs.
3. The step determines if the left front mini-wedge (door jamb switch) is shorted to ground.
7. This step determines if the right front mini-wedge (door jamb switch) is shorted to ground or if CKT 262 is shorted to ground.