MODEL IDENTIFICATION
| Body Code (1) | Model |
|---|---|
| "G" | Aurora |
| "H" | Bonneville & LeSabre |
| (1) Vehicle body code is fourth character of VIN. | |
| (1) | Vehicle body code is fourth character of VIN. |
MODEL IDENTIFICATION
DESCRIPTION
The Electronic Level Control (ELC) system automatically raises or lowers rear of vehicle to correct ride height (curb height), compensating for loads added to or removed from vehicle. System consists of a compressor, air drier (desiccant) exhaust (vent) solenoid, compressor relay, height control sensor, air adjustable shocks, pressure limiter and connecting air lines. Air drier (mounted on compressor) contains moisture-absorbing dry chemical and valves that maintain minimum system air pressure at about 7-14 psi (.49-.98 kg/cm 2 ).
SYSTEM OPERATION
When ride height decreases due to weight being added to vehicle, height control sensor arm assembly rotates upward in relation to height control sensor. This activates a timing circuit in height control sensor. After a delay of 17-27 seconds, height control sensor grounds compressor relay, turning on compressor. Air is then pumped into the shock absorbers, raising vehicle. Delay prevents system from operating during normal changes in ride height that occur during driving. As vehicle rises, height control sensor rotates downward. When vehicle rises to within one inch (25 mm) of curb height, height control sensor opens ground circuit to compressor relay, turning compressor off.
When ride height increases due to weight being removed from vehicle, height control sensor arm assembly rotates downward. This activates the timing circuit in height control sensor. After a delay of 17-27 seconds, height control sensor grounds exhaust solenoid valve circuit, causing air to be vented from shock absorbers, lowering vehicle. When vehicle lowers to within one inch of curb height, height control sensor opens exhaust solenoid valve circuit, causing exhaust solenoid valve to close.
To ensure system is operating with at least minimum air pressure, height control sensor commands an air replenishment cycle each time ignition is turned on. An internal timer circuit is activated when ignition is turned on. After a delay of about 35-55 seconds, compressor turns on for 3-5 seconds to ensure residual system pressure exists. If weight is added to or removed from vehicle during 35-55 second delay, air replenishment cycle will be overridden and vehicle will rise or lower after normal time delay.
Bonneville is equipped with an accessory inflator that is manually operated and is located in trunk. System is powered and monitored by Rear Integration Module (RIM). When momentary switch is closed with ignition turned on, RIM commands Electronic level Control (ELC) relay on, which engages low volume, high pressure ELC compressor for approximately 10 minutes to allow inflation of off-vehicle accessories. Inflation cycle can be terminated at any time during cycle by pressing inflator switch again or turning ignition switch to OFF. After original 10 minute cycle expires, inflator may be restarted again for another 10 minute cycle or until accessory being inflated is complete.