2012 Chevrolet Police Technical Manual (pdf) - GM Fleet

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A Radio LF_RAD_RTN LF_RAD_OUT RF_RAD_RTN RF_RAD_OUT 118. GY 0.5 A A 118. GY 0.5 P267 J267 Radio Twist 201. BN 0.5 RH Front Body Hinge Pillar C wIrINg DIagram – caPrIcE 9c1 aND 9c3 | 29 wIRING PROVISION FOR FRONT SPEAkERS - OPTION wX7 B P267 C P267 D P267 B Twist 201. BN 0.5 J267 Radio 117. D-GN 0.5 C 117. D-GN 0.5 Radio Twist 200. L-GN 0.5 D 200. L-GN 0.5 J267 Twist Front of Dash Radio LR_RAD_RTN LR_RAD_OUT RR_RAD_RTN RR_RAD_OUT 116. YE/RD 0.5 E E P267 J267 116. YE/RD 0.5 F P267 G P267 H P267 199. BN 0.5 A Radio Twist 199. BN 0.5 F B J267 G J267 Twist Radio 115. L-BU 0.5 115. L-BU 0.5 Radio Twist 46. D-BU 0.5 J267 46. D-BU 0.5 To Left Front Speakers To Right Front Speakers To Left Rear Speaker To Right Rear Speaker C Cabin air �lter below RH end of Cowl grille (raised) H Twist WX7 IN-LINE HARNESS ADDED HERE TO SEND LEFT FRONT AND RIGHT FRONT RADIO OUTPUTS TO LEFT REAR AND RIGHT REAR SPEAKERS BLUNT CUT CIRCUITS FROM FRONT SPEAKERS ARE COILED IN RIGHT FRONT FOOT WELL Approximately 60 inches (1.5 m) of auxiliary speaker wiring is routed from the front door and windshield pillar speakers and coiled under the instrument panel. The wiring permits connection of the front speaker pairs to customer-installed communication equipment. Vehicle radio front speaker outputs are re-routed to the rear speakers to maintain the required open door/key-in-ignition audible warning. A vehicle radio mute circuit is available to mute the radio audio signal when customer radio is transmitting. See the wiring diagram for Controlled Power and Signal Circuits wIRING PROVISION - 25MM AccESS HOLE - RH DASH PANEL A) Blanking grommet through front of dash below the oval wire grommet B) Bulkhead in filter chamber C) Possible upfit harness routing 2012 Chevrolet Municipal Vehicles Technical Manual
30 | aNtI-Lock brakINg systEm GM offers Anti-Lock Brake Systems as standard or optional on all North American passenger vehicles and light truck lines. The computerized Anti-Lock Braking System (ABS) is designed to keep the vehicle’s wheels rotating as the brakes are applied to assist the driver in achieving a controlled stop. Sensors monitor how fast the wheels rotate and feed the data continuously to the ABS computer. The vehicle’s brakes slow each wheel as the brake pedal is applied. However, when ABS is activated due to road conditions, the system repeatedly releases and applies pressure to the brakes. The wheels can keep rolling, thus retaining steering ability and enhanced stability while providing a higher braking force on most surfaces than a locked wheel provides. How exactly does ABS work? In cars without ABS, hitting the brakes can cause the wheels to lock, leaving you unable to steer the vehicle until you decrease the pressure so the wheels can roll again. With an ABS, as you apply the brakes, the ABS computer monitors the wheel speed sensor information. If the computer senses that a wheel is approaching lock up, it sends a signal to the hydraulic modulator to reduce, then to reapply, brake pressure several times a second for as long as you maintain firm pressure on the brake pedal. The process is much like the threshold braking technique used with conventional brakes. However, ABS does it much faster and more accurately than any driver can, leaving you free to focus on steering away from obstacles. Does ABS reduce stopping distances? Yes, in braking situations where the wheels on a non-ABS equipped vehicle would lock up, ABS will generally provide shorter controlled stopping distance. The amount of improvement in stopping distance depends on many factors, including the road surface, severity of braking, initial vehicle speed, etc. On some surfaces, such as gravel roads, braking distances can be longer, but you will still have the control benefits of ABS. The important capability of ABS is control. ABS provides improved vehicle steerability and stability when braking. What can affect the ABS advantage? It is important that you follow the maintenance schedule recommended in the owner’s manual of the vehicle, tires should be at their proper inflation level, the brake pads should be checked regularly, etc. While driving, you should sit comfortably, so that your hips are back in the seat and your knees are bent, even while braking. Your foot should be positioned so that your heel is on the floor and your toes are secure on the lower half of the pedal. And, though ABS may reduce stopping distance, remember: The faster you go, the longer it takes you to stop. Keeping a safe distance between you and the vehicle in front of you is always necessary, even with ABS. What happens if ABS becomes inactive? The ABS electronic control unit has on-board diagnostic capability. If a fault is detected, the vehicle will revert to the base brake system, and the ABS telltale on the dash will be illuminated. Should this happen, the vehicle should be taken to a dealership for repair as soon as possible. How do I use ABS? Depress and hold the pedal. DO NOT PUMP THE BRAKES (that prevents the system from working). Just hold the brake pedal down and let the ABS work for you. You may feel the brake pedal vibrate, or you may notice some noise, but this is normal as the system works for you. 2012 Chevrolet Municipal Vehicles Technical Manual Should I drive an ABS equipped vehicle differently than I would drive a vehicle with conventional brakes? Most of the time, under normal driving circumstances, there is no difference, and you should always drive with the same caution and care. It is important to realize that ABS only makes a difference when it is activated—when you have to brake hard—and that would only be when the computer senses that a wheel is approaching lock up. When ABS activates keep steady pressure on the brake pedal and then let the ABS work for you. Don’t pump the brakes or try to find the threshold. Simply hold the brake pedal down and steer if necessary to avoid an obstacle. Is ABS always active? ABS is always available, but not always activated. ABS is activated only when the brake pedal is applied and the computer detects an impending wheel lock condition. Can older cars be retrofitted with ABS? No! The brake system is one of the most important features on any passenger vehicle. Several products, which tap into the master cylinder and/or brake system performance, are being sold in the aftermarket. Some of these products imply performance similar to new vehicle anti-lock brake systems. However, contrary to their claims, add-on systems, which deplete fluid from the master cylinder on brake apply may actually increase a vehicle’s stopping distance. This may cause the vehicle to fail to comply with Federal brake standards. Does ABS always activate at the same speed? No, the system operates when the computer detects wheel lockup, at any speed above 8 mph. Will ABS wear out a vehicle’s brakes sooner? A properly maintained brake system will be unaffected by ABS operation under typical driving conditions. Are there different types of ABS? Yes, there are rear wheel anti-lock systems (RWAL) used on some trucks and four-wheel ABS available on cars and trucks. Do Federal Safety Standards mandate ABS? No. Federal standards establish minimum braking performance requirements that all vehicles must meet, but do not specify how they should be met. It should be noted that even a vehicle with failed ABS meets the Federal safety standard for stopping distances. Will a tire size change affect ABS? Use of tires other than original equipment may affect ABS performance. Owners should consult and follow the recommendations contained in the vehicle owner’s manual regarding replacement tire size. Note: ABS will work with original equipment spare tire or tire chains. However, performance is reduced. Do insurance companies give a discount for ABS? Yes, many insurance companies give discounts that range from 5% to 10%. In the states of New York and Florida all insurance companies are required to give an ABS discount of 5% on certain coverages such as bodily injury, property damage, collision, and personal injury protection. In other states the discount varies from insurance company to insurance company. When buying auto insurance, always ask your insurance agent if his/her company gives a discount for vehicles equipped with antilock brakes.
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