![]() On top of all of that, the first step in the roof module logic is to make sure the car is not moving, and with no speed reported, it would just shut down and not open the roof. If the TCU wasn't on, it could not talk on the CAN bus (P1747) and report a speed (P0500). In the end it was just a bad relay that wasn't turning the TCU on. So a lot of time and $$ in parts I suspect had been tossed at the big issue (limp mode) until the owners just gave up. The REAL tools use OEM proprietary connections under the hood to access ALL of the modules. LOTS of stuff gets lost in the translation. That was wrong, and it is what happens when you use generic OBDII codes on an older German car. they were being told that there was a wiring problem "between the sensor and the computer". Next I tried the convertible hardtop, and whhhrrriiirr click click buzz whhrrrhhrr clunk, it disappeared into the trunk.įor the final fix I will either repair, modify, or replace the k40 Relay Module. Since it was up on stands, I put it in drive. The brake warning light went out and via the generic OBDII scan tool I read that the two codes were now clear. I held it shut with some cardboard and cycled the engine off and back on. I closed it manually and immediately the engine ran better. I checked and one of the non responsive relays was for the TCU circuit. I checked for 12v signals at the relay coils and 3 were actually being commanded on. However, on the dash, the brake wear indicator was now out. When I turned the car "on" only one relay closed. Nothing complicated, but it is annoying to have 5x the chance of failure. This is a relay board that essentially does the job of 5 relays and fuses. I have spent a lot of time reading on SLK and MB forums about issues that are common on these cars. I fixed that with two waterproof butt splices. ![]() I also found that the RF brake wear sensor wire was broken. So I jacked up the car and pulled the wheels for the first time, and found that there was a new wheel speed sensor on the front left. Transmission in limp mode (2nd gear only).Ĭodes P1747 No CAN BUS Data to Transmission Or at least that's what I feels like to me when you can't access the REAL data stream. I got tired of waiting for my carsoft v12 multiplexer to arrive from Belgum, so I decided to poke at the MB with sticks.
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