The car has on the message board "battery saver active" the diagnostic states that the battery is normal what does this battery saver mean?

The Cadillac battery saver feature activates when it senses a lower than normal battery voltage. This could be due to a alternator that is not charging or maybe a bad battery.
If you can get it started with a jump start, most auto parts stores will test battery and alternator for free.

Do you know about automotive electronic's ? Control module's , DTC'S - diagnostic trouble code's ?
Exterior Lighting
The Steering Column Control Module (SCCM) monitors the headlamp switch position by sending voltage signals on multiple circuits to the headlamp switch. There is one circuit for each headlamp switch position. At any given time, one of the signal circuits is switched to ground. The SCCM sends a message over the High Speed Controller Area Network (HS-CAN) to the Body Control Module (BCM) to indicate the headlamp switch position.
If the SCCM does not detect any active inputs from the headlamp switch for 5 seconds, or if the SCCMdetects multiple headlamp switch input circuits short to ground, the SCCM sends a message to the BCM to indicate the fault. The BCM then turns the parking lamps and headlamps on and keeps them on until the battery saver feature times out.
Refer to Exterior Lighting in the Description and Operation portion of this section for information regarding the Battery Saver feature.
If either situation occurs, the SCCM and the BCM cannot be ruled immediately as being at fault. This is normal behavior of the SCCM and the BCM design as a fault has been detected with the inputs from the headlamp switch.
The BCM provides voltage to the parking lamps and headlamps when it receives a network message from the SCCM that the headlamp switch is in the HEADLAMPS ON position, .
Section 418-00, No Power To The Scan Tool, to diagnose no power to the scan tool.

1. If the scan tool does not communicate with the vehicle:
   • verify the ignition key is in the ON position.
   • verify the scan tool operation with a known good vehicle.
   • refer to Section 418-00 to diagnose no response from the PCM.

1. Carry out the network test.
   • If the scan tool responds with no communication for one or more modules, refer to Section 418-00.
   • If the network test passes, retrieve and record the continuous memory DTCs.

1. Clear the continuous DTCs and carry out the self-test diagnostics for the BCM and the SCCM .

1. If the DTCs retrieved are related to the concern, refer to Diagnostic Trouble Code (DTC) Chart in this section. For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in Section 419-10.

1. If no DTCs related to the concern are retrieved, GO to Symptom Chart.

free diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on lighting , then under subsystem click on interior lighting . Click the sear search button then the blue link. I see one fuse in the CJB F24 - 15 amp . Also i see battery saver relay . The instrument cluster energizes the battery saver relay .

Principles of Operation
Vehicles equipped with remote keyless entry (RKE) have an illuminated entry feature, which enables the instrument cluster to illuminate the interior lamps (and if equipped, the puddle lamps in the exterior mirrors) when an unlock signal is received from the vehicle security module through the UBP network, or when any of the doors are opened. The instrument cluster controls the interior lamps illuminated entry feature by activating the battery saver relay. When active, the illuminated entry feature will be canceled when any of the following conditions are met:

• 25 seconds have elapsed since the illuminated entry feature was activated and the interior lamp control is not activated (door ajar or dimmer control switch ON).
• On vehicles equipped with RKE, the instrument cluster received a request from the vehicle security module (remote transmitter lock button pressed) and the interior lamp control is not activated.
• The ignition is in the RUN or START position and the interior lamp control is not activated.

For vehicles equipped with RKE, the instrument cluster illuminates the interior lamps when any door is open. The interior lamps shut off when the doors are closed and the illuminated entry feature is not active or when the vehicle speed is greater than 15 km/h (6 mph). The interior lamps are not reactivated until the vehicle speed is less than 15 km/h (6 mph) and a new door open signal is received.
For vehicles without RKE, the instrument cluster illuminates the interior lamps and puddle lamps (if equipped) when any door is open. The instrument cluster will turn the interior lamps and puddle lamps (if equipped) OFF when the doors are closed.
Power to the on-demand lamps, illuminated vanity mirrors and map lamps are controlled by the battery saver relay.

Inspection and Verification

1. Verify the customer concern.

1. Visually inspect the following for obvious signs of electrical damage:

Visual Inspection Chart Electrical

• Bulbs
• Central junction box (CJB) fuse 24 (15A)
• Circuitry
• Vehicle security module (if equipped with RKE)
• Instrument cluster
• Door ajar switches

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
   • check that the program card is correctly installed.
   • check the connections to the vehicle.
   • check the ignition switch position.

1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.

1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
   • CAN, ISO or UBP circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
   • No response/not equipped for instrument cluster, refer to Section 413-01 .
   • No response/not equipped for vehicle security module, refer to Section 419-10 .
   • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the instrument cluster.
   • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the vehicle security module.

1. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index or the Vehicle Security Module Diagnostic Trouble Code (DTC) Index.

1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .

BATTERY SAVER ACTIVE
Charging System Description and Operation - The charging system on your vehicle is computer controlled . Have the vehicle checked for DTC'S diagnostic trouble codes . These systems warning message's arn't ment for the owner to do anything , except ,to take their vehicle to a qualified repair shop.

Battery Saver Active
Refer to Charging System Description and Operation

Battery Saver Active
The BATTERY SAVER ACTIVE message will display on the driver information center (DIC) when the vehicle enters a load shed 2 event. Refer to Load Shed System Description and Operation for load shed 2 setting criteria.
Electrical Power Management
The electrical power management (EPM) is used to monitor and control the charging system and alert the driver of possible problems within the charging system. The EPM system makes the most efficient use of the generator output, improves the battery state-of-charge (SOC), extends battery life, and manages system electrical loads.
The load shed operation is a means of reducing electrical loads during a low voltage or low battery SOC condition.
The idle boost operation is a means of improving generator performance during a low voltage or low battery SOC condition.
Each EPM function, either idle boost or load shed, is discrete. No 2 functions are active at the same time. Idle boost is activated in incremental steps, idle boost 1 must be active before idle boost 2 can be active. The criteria used by the body control module (BCM) to regulate EPM are outlined below:

I dought you will be able to get it running , except by luck . The best thing you could do is have a qualified repair shop diagnose it . The first place to start would be to hook up to a factory diagnostic scan tool , Check for DTC'S - diagnostic trouble codes .

Electric Power Management
The vehicle has Electric Power Management (EPM) that estimates the battery's temperature and state of charge. It then adjusts the voltage for best performance and extended life of the battery.
When the battery's state of charge is low, the voltage is raised slightly to quickly bring the charge back up. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gage or a voltage display on the Driver Information Center (DIC), you may see the voltage move up or down. This is normal. If there is a problem, an alert will be displayed.
The battery can be discharged at idle if the electrical loads are very high. This is true for all vehicles. This is because the generator (alternator) may not be spinning fast enough at idle to produce all the power that is needed for very high electrical loads.
A high electrical load occurs when several of the following are on: headlamps, high beams, fog lamps, rear window defogger, climate control fan at high speed, heated seats, engine cooling fans, trailer loads, and loads plugged into accessory power outlets.
EPM works to prevent excessive discharge of the battery. It does this by balancing the generator's output and the vehicle's electrical needs. It can increase engine idle speed to generate more power, whenever needed. It can temporarily reduce the power demands of some accessories.
Normally, these actions occur in steps or levels, without being noticeable. In rare cases at the highest levels of corrective action, this action may be noticeable to the driver. If so, a Driver Information Center (DIC) message might be displayed, such as BATTERY SAVER ACTIVE, BATTERY VOLTAGE LOW, or LOW BATTERY. If this message is displayed, it is recommended that the driver reduce the electrical loads as much as possible. See DIC Warnings and Messages.
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Your probably going to need to take to a dealer for this , I don't how much you know about modern automotive charging systems . Plus it would help to have a professional scan tool ! The charging system on you vehicle is computer controlled ! The engine control module (ECM) controls the generator through the generator L-terminal control circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. Between 0-5 percent and 95-100 percent are for diagnostic purposes. The following table shows the commanded duty cycle and output voltage of the generator:
The BATTERY SAVER ACTIVE message will display on the driver information center (DIC) when the vehicle enters a load shed 2 event. Refer to for load shed 2 setting criteria.
The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs 3 functions:
It monitors the battery voltage and estimates the battery condition.

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It takes corrective actions by adjusting the regulated voltage.

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It performs diagnostics and driver notification
Load Shed 2 Start
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Less Than 10.9 V
Battery has a net loss greater than 12 AH
Rear defrost, heated mirrors, heated seats cycled OFF for 50% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC.
You have a charging problem or battery problem !

means that you have been drawing power from the battery too long with out the cars charging system working so the car is designed to automatically cut down its power usage and display the message to let you know that battery power is in danger of being low

I suspect you have some loose connections or shorts in the wiring harness. I've had similar strange things happen with an Olds Bravada. Various transmission shifting problems, faults, etc. that all seemed to come from the engine's computer system getting incorrect voltages and readings due to wiring faults/shorts.

turn on your car and remove the ground cable from the battery, if the car dies it's time for a new alternator, if not take your battery in to be checked. The other message(traction control) may be just due to a faulty battery/alternator.