Info - Procedure to Disable Illumination of Service Indicator AFTER Installing Passive Struts

This bulletin is being revised to clarify when this bulletin may be used to turn the service suspension lamp off . Also, a step has been added to the 1991 Cadillac Eldorado and Seville repair. Please discard Corporate Bulletin Number 00-03-11-001 (Section 3 -- Suspension).

Some owners may bring their vehicles in for service with an illuminated service suspension light. The service suspension indicator lamp is telling the owner that the vehicle is due for strut/shock replacement, a maintenance item. The customer may elect to have passive struts installed in their vehicles due to repair cost savings and/or parts availability. The installation of passive shock/struts will result in handling characteristics which are the equal to a like vehicle without the computer controlled ride, with all other components such as tires, tire pressure, springs, etc. being equal. The installation of (4) new passive struts will cause the continued illumination of the service suspension indicator. If desired by the customer, the service indicator may be disabled AFTER THE INSTALLATION OF THE (4) NEW PASSIVE STRUTS, using the appropriate service procedure listed below. This bulletin DOES NOT authorize this procedure unless (4) NEW PASSIVE STRUTS WERE INSTALLED ON THE VEHICLE.

The wiring harness going to each strut and or shock assembly should be cut and taped back to clean-up the appearance both under the hood and under the vehicle. In addition, each specific vehicle will require a modification as outlined below.

1989-1992 Allante with Speed Dependent Damping (SDD)

Refer to the Service Manual page 8D-13 (1989) or 8D-14 (1990-1992). On these vehicles, adjust the BCM Override value "BS08". To do this, use the warmer/cooler button on the CCDIC to decrease the BCM override value "BS08" which is displayed when you enter the system by two (2). When the desired number is displayed on the CCDIC, it must be stored by holding the "Elapsed Time" and "Fuel Used" buttons until the new value flashes on and off. When it flashes on and off, the new value has been stored.

1991 Eldorado and Seville with Computer Command Ride (CCR)

Refer to the Service Manual page, 8D-12. Set the BCM override value "BS09" to "0" by using the warmer and cooler buttons. Store this value by pressing the "Econ" button on the Climate Control Panel and the "Instant Econ" button on the Fuel Data/Drivers Information Center for about five seconds. The new value will be stored even though the indicator does not flash. Remove the key from the ignition. Disconnect both battery cables from the battery. When both cables have been disconnected, touch the ends of the cables together and hold for five seconds. This will discharge the capacitors in the system and allow the system to perform properly when the battery cables are reconnected. Advise the customer they will have to reset all radio stations and the clock.

1992 Eldorado and Seville with Speed Sensitive Suspension (SSS)

Refer to the Service Manual page, 8C1-11. Observe and record the IPC override "IS08" displayed value. Use the climate control "cooler" button to decrease the value displayed for "IS08" by "8". To store the new value, press and hold the "ECON" and "FRONT DEFROST" keys until the new value flashes on and off.

1993 Eldorado and Seville with Speed Sensitive Suspension and 4.9L Engine Only

Refer to page 8A-43-6 in the 1992 Eldorado Seville Service Manual.

1. Cut circuit 1020 (PINK).
2. Attach the IPC side of circuit 1020 to relay pin 87A.
3. Attach the module side of circuit 1020 to relay pin 86.
4. Run a ground wire to relay pin 30.
5. Run a wire from a switched ignition (hot in Run) source to relay pin 85.

1991-1993 DeVille with Computer Command Ride (CCR)

Refer to the Service Manual, page 8A-43-0. Cut Circuit 1300 (Dark Green wire) at the CCR module (Pin C15) to disable the indicator lamp. Tape the wires back into the harness to prevent shorting to other components.

1994-1995 DeVille with Speed Sensitive Suspension (SSS) and 4.9L Engines Only

Refer to the 1994 Eldorado, Seville, DeVille Service Manual, page 8A-43-14.

1. Locate and cut circuit 370 (RED).
2. Attach the IPC side of circuit 370 to pin 87A of the relay.
3. Attach the module side of circuit 370 to pin 86 of the relay.
4. Run a ground wire to relay pin 30.
5. Run a wire from a switched ignition (hot in Run) source to relay pin 85.

1992-1993 Oldsmobile Achieva with Computer Command Ride (CCR)

This is a stand alone system. Remove the CCR module which is attached to the back side of the right (passenger side) sound insulator panel. Follow the wiring harness up under the dash assembly and then cut and tape the wiring harness.

1992-1994 Buick Skylark with Computer Command Ride (CCR)

This is a stand alone system. Remove the CCR module which is attached to the back side of the right (passenger side) sound insulator panel. Follow the wiring harness up under the dash assembly and then cut and tape the wiring harness.

1993-1996 Buick Park Avenue with Computer Command Ride (CCR)

This is a stand alone system. Remove the CCR module, which is located under the carpeting beneath the driver's seat.

1991-1995 Oldsmobile Ninety Eight with Computer Command Ride (CCR)

This is a stand alone system. Remove the CCR module, which is located under the carpeting beneath the driver's seat.

1994-1999 Pontiac Bonneville with Computer Command Ride (CCR)

The feedback strut/shock assemblies are still available for these vehicles. However, if the customer desires to reduce the repair expense, the following steps may be taken to allow installation of non-feedback assemblies and the disabling of the malfunction indicator lamps.

This is a stand alone system. Remove the CCR module, which is located under the carpeting beneath the driver's seat.

The following parts are required to make the correction on the 1993 Eldorado/Seville and the 1994-1995 DeVille.

Parts are currently available from GMSPO.