LS V8-3.9L VIN A (2003)
^
Power Tilt/Telescopic Steering Column
^
Headlamps/Park Lamps On
^
Key In Ignition
^
Key On Ignition
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Anti-Theft Hood Switch
^
Brake Pedal Position Switch Memory Seat Switch
Battery Drain Diagnosis
In order to properly diagnose a baffery drain concern, the following procedures must be followed exactly as stated to produce the most accurate results.
1.
Ask the customer how long the vehicle must sit before the battery goes dead. The vehicle is equipped with a 750 amp hour battery from the
factory. If the battery is in proper working order, it will be able to withstand a 1 amp draw for 48 hours without dropping the battery voltage below
10.5V. This information may help determine the amount of current drain present. For example, if a vehicle with a fully charged battery will not
start after an overnight soak, it can be assumed the baffery current drain is greater than 4 amps. This knowledge may aid in diagnosis.
2.
Check for any aftermarket equipment installed in the vehicle. Ask the customer if they removed any aftermarket equipment before bringing vehicle
in for service. All aftermarket equipment remaining should be removed before proceeding with this test.
3.
Ask the customer if any electrical component(s) is inoperative or malfunctioning. In many cases a draining battery concern can usually be traced
back to a component that has experienced operational trouble.
4.
Using an appropriate scan tool, check all available modules in the vehicle for both on-demand and continuous memory diagnostic trouble codes
(DTCs). Repair any on-demand DTC's before continuing with this article. Record any continuous memory DTCs which may aid in future
diagnosis.
5.
Check that the vehicle battery is properly charged and that the charging system is operating correctly. Refer to Workshop Manual Section 414-00.
6.
Install a quick disconnect style Battery Saver Vehicle Anti-Theft Switch between the negative battery post and cable, such as Little fuse Part
Number ATD 100 BP or Moroso Part Number 74103.
7.
Drive the vehicle for at least 20 minutes over 30 mph (48 km/h) to reach full engine operating temperature and to turn on and activate vehicle
systems. Make sure all electrical components operate correctly like the horn, audio system, exterior/interior lighting, climate control, etc.
8.
Open the Left Front and Right Front door and engage the latches so the vehicle interior can be accessed without disturbing the modules during this
test.
9.
Lift the hood and compress the Anti-Theft Hood Switch with a clamp (if equipped).
10.
Open the trunk lid and unplug the electrical connection to the Luggage Compartment Lamp. Lift and secure the trunk floor panel hook to the trunk
opening pinch weld. The battery and the Rear Power Distribution Box are now easily accessible.
NOTE
DO NOT ALLOW BATTERY POWER TO BE DISCONNECTED FROM THE VEHICLE AT ANY TIME DURING THIS TEST. IF BATTERY
DISCONNECT OCCURS, THE ENTIRE TEST MUST BE PERFORMED AGAIN STARTING AT STEP 5.
11.
Use a Multimeter (DVOM) with a MIN/MAX feature to measure the battery current drain. The DVOM must be capable of reading DC milliamps
(minimum 1mA) and have 10 amp - fused capacity.
12.
Use the following procedure to measure current drain.
a.
Turn on the DVOM and select DC AMPS.
b.
Attach a large alligator clip on each side of the Battery Saver/Anti-Theft Switch Terminals.
c.
Connect the DVOM in series by securing the leads to the alligator clips on the Battery Saver/Anti-Theft terminals.
d.
Loosen the knob on the Battery Saver/Anti-Theft Switch to break the contact between the negative battery terminal and cable.
NOTE
DO NOT USE A TEST LIGHT OR A VOLT METER AS A CHECK FOR EVIDENCE OF CURRENT FLOW. A TEST LIGHT WILL NOT
