Date registered: Mar 2014
Vehicle: 97 SL600 Pano, ex: 96 (late 95) SL320
Location: Helsinki, Finland
Mentioned: 2 Post(s)
Quoted: 25 Post(s)
ADS 2 damper valve fault C1326
Today after about an hour of driving the ADS MIL went on. There were no other symptoms - ride quality wasn't affected. I had my Star laptop with me so after checking the fluid level I read the codes, and the only one present was C1326 which refers to the first (of 2) solenoid valve Y54y1 of the rear right damper valve assembly Y54, and apparently means either open or short circuit. The ADS light came back on after clearing the code. I drove another 15 minutes or so, stopped for a few minutes to unload the car, then did a couple of 5-minute drives and the light stayed off, so the problem seems to be intermittent.
Afterwards I crawled under the car and cleaned the connector of the damper valve in question with some electronics cleaner. I also removed the ADS computer and measured the resistance of the solenoids. All 4 rear solenoids were about 11.8 ohms which is within the allowed range of 10-16 ohms. A few weeks ago I already cleaned the computer and its connector.
Am I right in saying that the only possible culprits of this are the solenoid itself, the wiring and connectors, and the ADS computer? I haven't found any previous threads on the topic relating to this code, or the similar C1321-C1327, for the R129 or the W140. What I can find is the same codes happening on certain later S class cars with air suspension, not to be named here in order to not throw off search engines, but I doubt these systems have much in common.
I probably wouldn't be posting this thread at all yet before waiting to see if the problem comes back, if it weren't for the fact that I'm going on a 3-week road trip in Europe with the SL starting next Friday. So I'm in a hurry to find any possible remedies for the issue, and especially any info on whether this is likely to cut our trip short (or more likely, the car's trip). I doubt it seeing as there were no ride quality symptoms, but any thoughts?
It might be worth mentioning that despite my best efforts I haven't ever been able to notice any difference with the suspension in sport or comfort mode. The light in button goes on and in HHTWIN I can see that the current going through the valves changes in the different damping modes, but when pressing down on any of the corners, or when driving, I haven't noticed any difference. According to the MB diagnostic manual, the difference should be clear when pressing down on a corner. During the year I've had this car, I've never had an ADS fault code before.