SL/R129: Strange Electrical Problems
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Joined: Oct 2002
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Strange Electrical Problems
1990 SL 500 | 104,000 Miles
Here's the list :
MAP LIGHT, LEFT SIDE - If you do the left/right toggle switch to turn on map light, the right works and the left doesn't. If you do the door on / manual on toggle switch, both lights come on as they should.
DRIVER SIDE WINDOW - If you press either UP or DOWN on the driver side window switch, the window goes up. The passenger side works normally. If you put the soft top up or down, both windows work like they should, moving up or down as you raise / lower the top.
POWER ANTENNA SWITCH - The radio antenna is currently in the "UP" position and won't come down via the switch, and doesn't go down when the radio is OFF.
DRIVER SIDE COURTESY LIGHT - The interior courtesy lights do not come on when the driver door is open. They operate normally when the passenger door is open.
Any ideas about what sort of problems would cause these issues ? Almost seems like a grounding problem to me but I'd sure like to hear any ideas you guys may have. Curious that all these problems are on the LEFT side of the car.
Thanks !
Here's the list :
MAP LIGHT, LEFT SIDE - If you do the left/right toggle switch to turn on map light, the right works and the left doesn't. If you do the door on / manual on toggle switch, both lights come on as they should.
DRIVER SIDE WINDOW - If you press either UP or DOWN on the driver side window switch, the window goes up. The passenger side works normally. If you put the soft top up or down, both windows work like they should, moving up or down as you raise / lower the top.
POWER ANTENNA SWITCH - The radio antenna is currently in the "UP" position and won't come down via the switch, and doesn't go down when the radio is OFF.
DRIVER SIDE COURTESY LIGHT - The interior courtesy lights do not come on when the driver door is open. They operate normally when the passenger door is open.
Any ideas about what sort of problems would cause these issues ? Almost seems like a grounding problem to me but I'd sure like to hear any ideas you guys may have. Curious that all these problems are on the LEFT side of the car.
Thanks !
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Joined: Jan 2006
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
I have all of the components mentioned above except for the antenna switch available for sale in good, used condition.
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Joined: Oct 2002
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Thanks for the reply, I will pull those switches and check them this morning.
I need a couple other parts and wonder if you have them.
1 ) 3rd Brake light assembly mounted in trunk.
2 ) Cruise Control stalk end cap.
3 ) A/C vent direction handle.
I can get some pics of what I need if I'm not describing it very well
I need a couple other parts and wonder if you have them.
1 ) 3rd Brake light assembly mounted in trunk.
2 ) Cruise Control stalk end cap.
3 ) A/C vent direction handle.
I can get some pics of what I need if I'm not describing it very well
Thread Starter
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Joined: Oct 2002
Posts: 10
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Ok got 1 problem figured out, the driver's window problem was indeed the switch. Swapped with passenger side switch and it operates normally.
I've looked at the power antenna problem but it's looking like I'm going to need a schematic to chase this one down. The UP/DOWN switch for the antenna has no power on the plug anywhere .. 5 pins, 2 are ground, 3 seem to be float, no 12v anywhere. The fuse is fine, and I don't hear the motor running on it.
Anybody have a R129 wire diagram / schematic available for download ?
Thanks
I've looked at the power antenna problem but it's looking like I'm going to need a schematic to chase this one down. The UP/DOWN switch for the antenna has no power on the plug anywhere .. 5 pins, 2 are ground, 3 seem to be float, no 12v anywhere. The fuse is fine, and I don't hear the motor running on it.
Anybody have a R129 wire diagram / schematic available for download ?
Thanks
Last edited by RacerX10; Aug 5, 2009 at 02:07 PM.
