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#1
06-20-2010, 04:21 PM
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99 SL500 - Top & Rollbar inoperative
Hello,
I know there are dozens of posts on this subject here, but have not been able to find a method to diagnose my particular problem. After replacing the front soft top latches and having the system work fine for months, the roll bar & soft top actuation has stopped working. No flashing lights on the buttons. I do hear a solenoid click when I try to activate either the top or the rollbar, however the pump does not start. Oil level is OK. Battery charge is OK, and underhood fuses #19 and #20 are good. Any thoughts?
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1999 SL500 
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#3
06-20-2010, 04:45 PM
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Hi, thanks for your quick reply. Yes, windows appear to be operating normally - they will raise and lower when the soft top switch is pressed, however the hydraulic system doesn't activate.
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1999 SL500 Last edited by HitParader; 06-20-2010 at 05:21 PM.
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#4
06-20-2010, 06:09 PM
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My 1991 has a fuse box in the trunk. I don't know about the 1999 model. But it's worth a look. Check this link for the fuse list and placement.
R129 fuse designation ..?
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Resistance is Futile.
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#5
06-20-2010, 06:58 PM
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Thank you, yes I forgot about that small panel in the trunk. All fuses are OK there however, including the 40A hydraulic pump fuse.
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1999 SL500
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#7
06-21-2010, 12:23 AM
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Quote:
Is it accurate that on the '99, the SDS can read the DTC's out of the top controller? If so, perhaps our friend should see what the diagnostics are showing. Bob
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Bob Jones Bradenton, FL '87 560SL-Sold '99 SL500 For Now
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#8
06-21-2010, 02:43 AM
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Hello, thanks for writing - it's my understanding that 96-up 129's require a scanner to read any DTC's generated by the top/rollbar controller, the old paperclip trick won't work. I would guess that any active DTC's would cause the dash and/or button lights to light up, however they are all off (the small arrows on the rollbar switch flash when the car starts, but do not stay lit).
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1999 SL500
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#9
06-22-2010, 09:24 PM
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even with the dash and control button not illuminated you can still have stored faults. hook up to the 38 pin conector and see whats going on
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88 W124 3.0 96 R129 119eng 06 ML350 98 ML320 sold 02 CLK55 amg
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