Andy Cottrell
Senior Member
- Joined
- Jun 5, 2001
- Messages
- 118
- Reaction score
- 1
- Your Mercedes
- E300D 1994 Diesel
The roof on my W124 Cab has stopped working correctly: the soft top cover will not go down.
The hydraulic reservoir is full , all operations done with the engine running, fuses checked.
The roof will retract normally until the point where the soft top cover should shut. It then ceases to function. At this point there are no faults on the diagnostic port ( read with a blink reader). If I reverse the process, the roof will shut correctly ( including the soft top cover shutting ). Still no faults on the diagnostic port.
The solenoids on the valves measure the correct resistance (5 to 15 ohms) and have power going to them at the right time in the roof movement sequence. I have measured the action of all the switches: they all change from low ohms to open circuit when they should. I am having difficulty measuring a voltage going to the switches as the plug to the soft top controller (124 820 4526) precludes me from measuring there and I can't gain access to all of the switch terminals. However, as the resistance on the switches change when they move, I'm pretty sure the switches won't be at fault and if I can measure power to solenoids Y56, Y5 and Y4 at the correct time in the sequence the controller should be working.
Any help/advice gratefully accepted.
Andy
The hydraulic reservoir is full , all operations done with the engine running, fuses checked.
The roof will retract normally until the point where the soft top cover should shut. It then ceases to function. At this point there are no faults on the diagnostic port ( read with a blink reader). If I reverse the process, the roof will shut correctly ( including the soft top cover shutting ). Still no faults on the diagnostic port.
The solenoids on the valves measure the correct resistance (5 to 15 ohms) and have power going to them at the right time in the roof movement sequence. I have measured the action of all the switches: they all change from low ohms to open circuit when they should. I am having difficulty measuring a voltage going to the switches as the plug to the soft top controller (124 820 4526) precludes me from measuring there and I can't gain access to all of the switch terminals. However, as the resistance on the switches change when they move, I'm pretty sure the switches won't be at fault and if I can measure power to solenoids Y56, Y5 and Y4 at the correct time in the sequence the controller should be working.
Any help/advice gratefully accepted.
Andy
