Wednesday, November 11, 2020

2010 Cadillac Truck SRX AWD V6-3.0L Page 220

2010 Cadillac Truck SRX AWD V6-3.0L Page 220



DTC B144B 02



- Run/Start Power Relay Circuit Short to Ground



DTC B144B 04



- Run/Start Power Relay Circuit Open



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) controls the RUN/CRNK relay through the control circuit by applying voltage to the run/crank relay coil control



circuit. The ignition RUN/CRNK is energized when the ignition mode is ON or START, or when a remote start is requested. This is part of the



BCM's primary function in controlling the vehicle power mode.



The keyless entry control module controls the backup power for the RUN/CRNK relay through the control circuit by applying voltage to the



run/crank ignition 1 voltage circuit. This circuit is a pass-thru in the BCM and will energize the RUN/CRNK when the ignition mode is ON or



START, or when a remote start is requested.



Conditions for Running the DTC



System voltage is greater than 9 V



Conditions for Setting the DTC



B144B 01



The run/crank output is not active and a short to battery is detected 3 consecutive times on the run/crank ignition 1 voltage circuit



B144B 02 - BCM



A short to ground is detected on the run/crank relay coil control circuit



B144B 02 - Keyless Entry Control Module



The run/crank output is active and a short to ground is detected 3 consecutive times on the run/crank ignition 1 voltage circuit



B144B 04



The run/crank output is not active and an open is detected 20 consecutive times on the run/crank ignition 1 voltage circuit



Action Taken When the DTC Sets



B144B 01, B144B 04



No action is taken



B144B 02



The RUN/CRANK relay is deactivated when the fault is set. After 100ms, the RUN/CRANK relay will be activated. If the fault is still set, the relay



will be deactivated. The RUN/CRANK relay will again be activated after 100ms. If this also results in a fault, the relay will be deactivated until a



new run/crank request is received.



Conditions for Clearing the DTC



* The current DTC will clear when the malfunction is no longer present and a run/crank request is received.



* A history DTC will clear after 40 malfunction-free ignition cycles.

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