300SD (140.134) L6-3.5L DSL Turbo (603.971) (1993)
NOTE: If one or more cycles of the closing assist supply pump are switched off by the safety feature (because of incorrect switch signals), the pump can
be reset by briefly interrupting circuit 30. This can be done by removing fuse f9 in rear fuse box F4 for approx. 5 seconds, or by disconnecting the
connector from the supply pump (M143). The pump should be reset before and after the function test. See: Closing Assist (CA)/ETP - Electrical Test
Program/Preparation For Test
Component Locations
A
Version up to chassis end no. 118120
B
Version as of chassis end no. 118121
M14/3
CA supply pump
S86/2
Left front door closing assist microswitch
S86/3
Left rear door closing assist microswitch
S87/4
Right front door closing assist microswitch
S87/5
Right rear door closing assist microswitch
S88/1
Rotary tumbler/trunk lid microswitch
S88/3
Trunk lid closing assist microswitch 1).
VL
Left front door
VR
Right front door
HD
Trunk lid
HL
Left rear door
HR
Right rear door
SK
Vacuum vent connection (with screen)
1) No longer installed as of chassis end no. 118121.
Preparation For Test
Preparation for Test:
1. Check fuses F4-3, F4-9 in rear fuse box F4.
2. Provide access to CA supply pump (M14/3).
3. Check that vent line SK is clear. If the line or filter is plugged, kinked or restricted, closing assist may function intermittently. Resetting pump
(M14/3) will not remedy this problem.
4. Electrical wiring diagrams.
NOTE: If one or more pneumatic circuits of the CA supply pump are switched off by the safety feature (incorrect pressure buildup times), the pump can
be reset by briefly interrupting circuit 30. This can be done by removing fuse F49 in rear fuse box F4 for approx. 5 seconds, or by disconnecting the