2010 Cadillac CTS Sedan AWD V6-3.6L Page 361
B1380 06, B1440 00
Ignition switch is in the RUN position.
Conditions for Setting the DTC
B1370 01
Ignition circuit is shorted to voltage.
B1370 06
* Ignition circuit is open.
* Ignition, accessory, or off/run/crank circuit shorted to ground.
* B+ circuit of the ignition switch is open or shorted to ground.
* IGN 1 relay coil control circuit open, including relay coil and ground.
B1380 01
Accessory circuit is shorted to voltage.
B1380 06
* Accessory circuit is open.
* Ignition, accessory, or off/run/crank circuit shorted to ground.
* B+ circuit of the ignition switch is open or shorted to ground.
B1440 00
BCM senses an open or short to voltage on the off/run/crank circuit when both ignition accessory/run and ignition run/crank parameters are active.
BCM senses an open on the B+ circuit to the ignition switch while the engine is running. An open on the B+ circuit can be caused by a short to
ground on any of the circuits listed below:
* B+
* Accessory
* Run/crank ignition voltage BCM terminal 19, X4
* Off/run/crank
B1441 01
Off/run/crank circuit is shorted to voltage.
B1441 06
Off/run/crank circuit is open.
Actions Taken When the DTC Sets
* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the
serial data communications circuits.
* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the
state of the engine run flag on the serial data communications circuits.
Conditions for Clearing the DTC
A current DTC clears when the malfunction is no longer present.
Diagnostic Aids
* A short to ground in the ignition circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428 should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification to the scan tool values of the vehicle will determine if there is a power mode fault.
Reference Information
Schematic Reference
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
* Power Moding Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Moding Schematics)
