2003 c240 no crank nostart after small electrical fire drivers side headlight harness
Thread Starter
Newbie
Joined: Oct 2022
Posts: 6
Likes: 0
From: Los Angeles high desert..Palmdale/ lancaster
2003 c240
2003 c240 no crank nostart after small electrical fire drivers side headlight harness
2003 c240 . My kid pulled up, killed the ignition. 2 mins later smoke starts coming out of drivers side hood. Fire melted the hood release connector keeping me from extinguishing the fire quickly.
it burned all 5 wires to drivers side headlight. Fire also melted oil fill cap, power steering reservoir and plate on brake line junction box.
Replaced all burned items. Spliced a new plug and wire for light. New hood release wires.
Tried to start with freshly charged battery. No clicking noise, no crank . Only fan comes on . It will turn over jumping the relay. But still no start.
I also noticed no fule pressure even after cranking with jumped relay. Any suggestions?
it burned all 5 wires to drivers side headlight. Fire also melted oil fill cap, power steering reservoir and plate on brake line junction box.
Replaced all burned items. Spliced a new plug and wire for light. New hood release wires.
Tried to start with freshly charged battery. No clicking noise, no crank . Only fan comes on . It will turn over jumping the relay. But still no start.
I also noticed no fule pressure even after cranking with jumped relay. Any suggestions?
Last edited by Rydsfv; Oct 24, 2022 at 04:47 AM. Reason: Car model
Thread Starter
Newbie
Joined: Oct 2022
Posts: 6
Likes: 0
From: Los Angeles high desert..Palmdale/ lancaster
2003 c240
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
Where in the world are you located? Might want to put that in your signature. Is your car LHD or RHD? Stuff like this would be helpful.
Does the ignition still unlock when the fob is inserted? (buzzing sound)
Does the ignition still unlock when the fob is inserted? (buzzing sound)
Thread Starter
Newbie
Joined: Oct 2022
Posts: 6
Likes: 0
From: Los Angeles high desert..Palmdale/ lancaster
2003 c240
yes it does.
I also checked for spark and fuel.
None. It will crank when key is inserted and turned if I jump the relay . Dash will light up and fan spins full speed with key in and turned.
But no jumper ..no crank. Not even a click
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
^ You might want to put your location information in your signature (the section under your username), as this helps others know which version of the car you have. See the other users and their posts in this thread (including mine, under the picture) for reference.
The fuel pump primes itself when the key is turned to position 2. The sound of the priming can be heard (light buzzing sound, audible from within the cabin) for a few seconds underneath the rear seat, on the R side. I assume the fuel pump itself is fine, but isn't receiving the signal to prime. This assumption is based on the fact that your starter and fuel pump are both refusing to run.
I'm also assuming the starter relay is fine. Try swapping 2 relays (there should be 3 of the same model inside the front SAM iirc) to eliminate it as the culprit.
Check fuses 31, 52, 57, and while you're at it, upgrade fuse 57 to 20A.
If the problem persists, I'm wondering if you missed a damaged (cooked) wire somewhere. I'd look at the wiring between the ignition module (EIS) and engine management module. Take a look here for more information. Sounds like the key rotation (step 3) is allowed but the start (step 4) is not authorized.
I don't think it's the crankcase position sensor (CPS) because the fuel pump would be operational.
The fuel pump primes itself when the key is turned to position 2. The sound of the priming can be heard (light buzzing sound, audible from within the cabin) for a few seconds underneath the rear seat, on the R side. I assume the fuel pump itself is fine, but isn't receiving the signal to prime. This assumption is based on the fact that your starter and fuel pump are both refusing to run.
I'm also assuming the starter relay is fine. Try swapping 2 relays (there should be 3 of the same model inside the front SAM iirc) to eliminate it as the culprit.
Check fuses 31, 52, 57, and while you're at it, upgrade fuse 57 to 20A.
If the problem persists, I'm wondering if you missed a damaged (cooked) wire somewhere. I'd look at the wiring between the ignition module (EIS) and engine management module. Take a look here for more information. Sounds like the key rotation (step 3) is allowed but the start (step 4) is not authorized.
I don't think it's the crankcase position sensor (CPS) because the fuel pump would be operational.
Last edited by slammer111; Oct 26, 2022 at 08:42 AM.
