Central Locking System INOP - Check/Modifications (80/2)

Publication date: 1987-12-01
Reference number: 80/2

CENTRAL LOCKING SYSTEM INOP - CHECK/MODIFICATIONS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 80/2, Date of Issue: December 1987

CENTRAL LOCKING SYSTEM MODIFICATIONS

Model(s): 1986 260E/300E/300D/300TD/300TE/300CE

1987 190D/190E

Group: Accessories & Electrical

Bulletin No.: 80/2

Date: December 1987

Symptom: Central Locking System Inoperative

As of vehicle production date (see table below), the plastic pneumatic lines to the rear door actuators have been shortened and a 14" (350 mm) long connecting hose was added as a stress relief. A rubber disc was also installed on the plastic line.

EFFECTIVE SERIAL NUMBER

Model	Chassis Number	Production Date
124	A 197790	February 1986
124.193	F 010913	May 1986
201	F 368078	May 1987

In case of customer complaints regarding the central locking system not operating on earlier production vehicles, check for good connection of the plastic pneumatic line to the rubber (elbow) hose of the rear door actuators. If disconnected, or under tension, install connecting hose.

PROCEDURE

Engage central locking system. If there is no vacuum/pressure leak, the supply pump will stop running after approximately five (5) seconds. However, if there is a leak, the supply pump will continue to turn for approximately 25 seconds before stopping. If a leak is detected, check both rear door actuators for a disconnected pneumatic line.
Remove "B" pillar cover, protective bellows between "B" pillar and rear door, rear door panel and rear door actuator.

Model 124

Partially remove the hard plastic line from the "B" pillar and cut off a piece 10" (250mm) in length.
Attach connecting hose (6) with rubber disc (7) to rear door actuator (1) in such a way that the disc is 3" (80mm) from the actuator.
Reinstall actuator with pneumatic connection pointing towards the front of the vehicle (repositioned 180° from previous positioning). Guide connecting hose into pillar.
Press rubber disc towards "B" pillar so that disc presses up against cut-out for protective bellows.
Insert pneumatic line (8) approximately 0.5" (12mm) into the connecting hose (6) inside the "B" pillar. See Fig 2 .
Check function of central locking system.
Re-install protective bellows between "B" pillar and rear door, rear door panel, and "B" pillar cover.

Fig 1: Connecting Hose & Rubber Disc Installation (Model 124)

Fig 2: Pneumatic Line Connection (Model 124)

Model 201

Partially remove the hard plastic line from the "B" pillar and cut off a piece 12" (300mm) in length.
From this 12" length of line, cut off a piece 4" (100mm) in length and save. Discard remaining line.
Assemble actuator and connecting hose according to Fig 3 . Insert pneumatic line (4" length) approximately 0.5" (12mm) into connecting hose.
Install rear door actuator with pneumatic connection pointing towards the rear of the vehicle.
Guide connecting hose into "B" pillar and press rubber disc towards "B" pillar so that the disc presses-up against cut-out for protective bellows.
Insert pneumatic line (6) approximately 0.5" (12mm) into the connecting hose (6) inside the "B" pillar. See Fig 4 .
Check function of central locking system.
Re-install protective bellows between "B" pillar and rear door, rear door panel, and "B" pillar cover.

Fig 3: Connecting Hose & Rubber Disc Installation (Model 201)

Fig 4: Pneumatic Line Connection (Model 201)

PARTS INFORMATION

DESCRIPTION	PART NUMBER
Connecting hose 14" (350mm)	007 997 61 82
Rubber disc	126 997 02 40