97 E320 immobilizer issues - PeachParts Mercedes-Benz Forum

Mighty190 · #1 06-27-2019, 09:35 AM

It's a car I'm trying to clean up the harness in to remove the engine and harness for a swap. It was running before that bus popped. I had not made any new changes to it. However I'm suspecting I need to reinstall the lock module from the passenger footwell. However I need to be sure I'm resetting it properly as I make these changes. This could be a real nightmare if I'm not careful about that.

97 SL320 · #2 06-27-2019, 07:21 PM

Quote:

Originally Posted by Mighty190

It's a car I'm trying to clean up the harness in to remove the engine and harness for a swap. It was running before that bus popped. I had not made any new changes to it.

Details matter here. So the car was running, fuse cleared, replaced, car won't run? As in there were no other changes? What made the fuse clear? I'm pretty sure the E320 fuse you replaced is for the electric air pump if so, it would appear someone inserted a 50A where a 40S should be.

Quote:

Originally Posted by Mighty190

However I'm suspecting I need to reinstall the lock module from the passenger footwell.

If this car is a 97 with a metal key and internal RFID chip, no resetting is required nor is the lock module involved. I've swapped the engine computer, DAS box and key a few times on me SL to test used parts.

Is there an antenna ring around the ignition lock cylinder? This antenna ring leads to the DAS box to the left and behind the instrument cluster. The DAS box is about 4 " x 5 " x 1 " and is black plastic.

Quote:

Originally Posted by Mighty190

However I need to be sure I'm resetting it properly as I make these changes. This could be a real nightmare if I'm not careful about that.

You really need to study a wiring diagram for this car.

Mighty190 · #3 06-27-2019, 07:30 PM

Anyone know where to find a wiring diagram for this? If I could find a complete one this would be much easier.

As for what happened exactly it started and ran one night, then a few days went by and I decided to pull the column, no changes to the wiring other than disturbing it so something may have been grounded when it shouldn't. I went to start it and it didn't even want to crank so I jiggled the starter hot and both wires from the battery. I had a crank no start issue. I checked all the fuses and the 50A one on the K40 relay under the hood was blown. With that replaced no change.

I have the basic key with the key ring and the module in the dash.

If there is no immobilizer issue then something else is causing the injectors to not work.