Service Procedure, Parts & Warranty Information
Vacuum Release Valve Replacement1. Remove knee bolster (G-Van only).
Figure 1 - G Van Vacuum Release Valve:
Figure 2 - M Van Vacuum Release Valve:
2. Disconnect electrical harness connector from valve. (Figures 1 and 2)
3. Disconnect vacuum hose from vacuum release valve.
4. Remove vacuum release valve by turning it counter clockwise.
5. Remove and retain retainer. Turn the retainer counterclockwise to unseat it.
6. Install retainer removed in step 5. Turn the retainer clockwise to seat it.
7. Install new vacuum release valve until it is seated in the retainer with the brake pedal in the depressed position.
8. Audible "clicks" can be heard as the threaded portion of the valve is pushed through the retainer toward the brake pedal.
9. Pull the brake pedal fully rearward against the pedal stop, until the audible "click" sounds can no longer be heard.
10. Release the brake pedal and repeat Step 9 to assure that no audible "click" sounds remain.
11. Connect vacuum hose.
12. Connect electrical harness connector.
13. Function check brake transmission shift interlock for proper operation:
A. Solenoid must lock gearshift lever bowl assembly whenever steering column is in "PARK" and when trying to shift from "PARK" without pressing brake pedal. (Solenoid is energized when ignition is on and solenoid is extended.)
B. Solenoid must release gearshift lever bowl assembly when pressure is applied to brake pedal. (Solenoid is de-energized.)
14. If system is inoperative, BTSI solenoid cable adjustment is necessary. Perform BTSI Solenoid Cable Adjustment. If operating properly, proceed to step 15.
15. Reinstall knee bolster (G-Van only).
16. Install Campaign Identification Label.
BTSI Solenoid Cable Adjustment
1. Be certain parking brake is engaged and vehicle wheels are blocked.
2. Ignition lock cylinder in "OFF" position (NOT THE LOCK POSITION).
3. Shift column out of "Park" position to "Neutral".
4. A. G-Van Only (Figure 3)
Figure 3 - Brake Transmission Interlock Solenoid Adjustment BTSI:
Unlock adjuster lock, pull inner and outer adjuster bodies apart while holding cable at positions (A) and (B). Bowl lock will hit at gearshift bowl.
B. M/L Van Only (Figure 4)
Figure 4 - Interlock Solenoid Adjustment:
Remove solenoid protector.
The lock button must be disengaged to allow cable movement. Push cable towards solenoid until the bowl lock hits bowl and travel stops. (Do not bow or bend inner cable wire between cable housing and cable fitting.)
5. Let cable move back 1.0 to 2.0 mm.
6. Engage lock button.
7. Install solenoid protector (M-Van only).
8. Check system operation. Refer to Step 13 of vacuum release valve replacement above.
IMPORTANT:
During Inspection and Adjustment of interlock solenoid assembly, solenoid will become hot.
9. Re-adjust if needed. If operating properly, proceed to step 10.
10. Reinstall knee bolster (G-Van only)
11. Install Campaign Identification Label.
PARTS INFORMATION
25% of parts required for this campaign will be preshipped to involved dealers of record. This preshipment will occur the week of November 21, 1994. Parts received for recently transferred vehicles should be forwarded by the original dealer (with an accompanying phone call) to the dealer that received the transferred vehicle.
Additional parts for this campaign are to be obtained from General Motors Service Parts operation (GMSPO). To ensure parts are obtained as soon as possible, order them from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).
Part Number Description Quantity
15995799 Vacuum Release Valve 1
WARRANTY INFORMATION
Dealers should submit a warranty claim on each vehicle completed under this campaign
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only oil a clean, dry surface.