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Upfit FAQ for Chevrolet Police Vehicles, Part 4

This is the fourth in a four-part series of answers to Frequently Asked Questions (FAQ) concerning features, function and upfitting of the 2008 Chevrolet Impala (9C1 or 9C3) and Tahoe 2WD (PPV) police package vehicles and Tahoe 4WD (5W4) special service vehicle. For Parts 1-3, go to and check the Article Archive under the Resources dropdown.

Question 9:

Why does my 2006 Tahoe voltmeter show 12 volts sometimes and other times it shows 14 volts?


The 2005 and later Tahoe is designed with a Regulated Voltage Control (RVC) system that is one of several features intended to enhance fuel economy. When the vehicle is operating in “Fuel Economy Mode” and no extra electrical load demand is present, the RVC will reduce the generator output to 12.6-13.1 volts. In effect, the system takes the generator off line to reduce engine load, and you see approximately battery voltage indicated on the voltmeter. If the electrical load increases, the RVC increases the generator output to meet the electrical energy demand, and the voltmeter indicates the increased output. The voltmeter fluctuation that you see is normal.

Question 10:

Can I operate my 2005 Impala police cars with the keyed-alike ignition key for my 2006 and 2007 police Impalas?


No. The ignition key for keyed-alike (fleet keyed) 2006, 2007 and 2008 Impalas will not operate 2000-2005 Impala fleet-keyed doors and ignition key cylinders or 2005-2006 Tahoe keyed-alike police packages. The 2006-2008 Impala fleet keys will work with 2007-2008 Tahoes if all the vehicle keys are cut to the same fleet key code.

Question 11:

How many keys and fobs can be programmed for my Impala?


The Impala Police (9C1/9C3) and Tahoe police (PPV) and special service (5W4) vehicles are delivered with two keys and fobs. Extra fobs can be obtained by ordering Option Code AMF. A maximum of eight key fobs can be programmed for a specific vehicle. Police packages ordered without fleet keying (keyed alike) can have up to six additional ignition keys made per vehicle. Police packages ordered with fleet keys, Option Codes 6E2 or 6E8, can have an unlimited number of ignition keys cut for each vehicle VIN. The owner’s manual contains a programming procedure for additional or replacement key fobs.

Question 12:

How should a lightbar roof harness be routed when my vehicle is equipped with a roof-rail airbag?


The Owner’s Manual Supplement and online service information provide airbag zone diagrams. The roof-rail airbags (RRAB) in the Impala and Tahoe are designed with an inflator module mounted behind the back door opening pillar and above the edge of the headliner assembly on the inner roof-rail structure. A lightbar wiring harness must be routed from the roof panel hole to the rear of the inflator, down to the floor and either forward to the front passenger compartment or into the cargo compartment.

Never route any harness over the airbag, i.e., up the windshield pillar or center pillar and over the airbag. The harness may tangle with the airbag front attachment at the windshield or trap the inflating airbag and prevent it from deploying properly to protect the occupant in the event of a side impact.

Question 13:

How can I turn off the front passenger’s airbag and the roof rail airbags?


The GM Police Vehicle front passenger side airbag (PSAB) and roof-rail airbags (RRAB) can be turned off by installing a switch for each airbag system. These switches interrupt the airbag firing circuits. Contact Kerr Industries ((905) 725-6561) for help with the airbag disabling waiver process and installation of switching in new vehicle orders using switches manufactured by A.O.I. Electrical.

Question 14:

What is the small “bump” that is in the center of my Tahoe floor mat between the seats?


The bump in the floor covering is to provide clearance for the rollover sensor that is part of the roof-rail airbag system. If your Tahoe is not equipped with a roof-rail airbag system, there will be no sensor mounted on the floor tunnel under the bump. If the vehicle has roof-rail airbags, the sensor will be fastened to the floor pan and must not be relocated. To do so may cause the airbag deployment to malfunction in the event of an accident. The floor covering bump is in every Tahoe to avoid two parts in the assembly plant.

Published in Police Fleet Manager, Nov/Dec 2008

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