NoC

I have a 94 S500, been working great and one day it does not start or crank. It almost looks like it's been disabled as in alarm disabled. Turn the key to start, all the lights light up but no crank or anything. Anybody have a fix to this?

vb26

what have you tried already,,, turn the key to start and try shifting the gear box from Park to low gear and back to Park, then try to start it.

shadowgriffen

Try # 1 first, if not then #2 could be it.

1. Neutral Safety Switch

https://mbworld.org/forums/showthrea...+safety+switch

2. Starter OR lower wiring harness

https://mbworld.org/forums/showpost....0&postcount=10

NoC

Thank you for your reply. I've already tried that and it still didn't crank.

doc willy

try to start in neutral

NoC

Didn't work. Didn't even try to crank.

pcmaher

Try this...

SUBJECT:
GROUP 54 - MODEL 140, VEHICLE WILL NOT CRANK
FUSE FOR CIGAR LIGHTER BLOWN

The fuse for the cigar lighter (F3f16) in Model 140 vehicles also controls the starter lock-out relay module (K38) as of January 1994 production. If this fuse blows, the vehicle will not start. The practice of powering aftermarket electrical accessories from the cigar lighter plug increases the likelihood of this fuse being blown. Therefore, in vehicles that cannot be started due to a blown cigar lighter fuse, relocate the power supply for the starter lock-out relay module (K38) as described in the following work procedure:

To eliminate the possibility of a blown cigar lighter fuse (F3f16, Circuit 15R) preventing the vehicle from being cranked (by removing the power source for the starter lock-out relay module (K38), the supply wire for K38 should be moved from fusebox F3 position 21 (F3f16) to position 27 (F3f19) as follows:

1. Disconnect battery negative (-) cable.

2. Lift fuse block F3 to reach the wiring beneath.

3. Locate wire position 21 using the diagram on page 00-B.4/2 (drawing B). It is a RD/VI wire, covered with black tubing, near screw connection "D".

4. Remove the wiring connector from position 21 by sliding the red plastic locking clip over (press near letter "L" on fuse block) and pulling the wiring connector out. Slide the locking clip back into the locked position.

5. Locate wire position 27. It is near screw connection "E".

6. Install the wire from position 21 into position 27 by sliding the locking clip over (press near letter "M"), pressing the wiring connector into position, and sliding the locking clip back into the locked position.

8. Reinstall fusebox F3 carefully, avoiding damage to wiring.

9. Mark the fuse card with a permanent marker as follows: At fuse position 19, add the words "STARTER LOCK-OUT". If necessary (inspect fuse card), draw a hollow circle (to indicate a 7.5A fuse) and install a 7.5A (brown) fuse.

10. Reconnect battery.*

11. Test function of Starter Lock-out Relay Module by starting engine.

*NOTE: Be sure to re-code the radio and synchronize the power windows after reconnecting the battery.