Wiring schematic for seat ECU

[todd17]

Anyone have wiring schematic for memory seat ECU? Specifically, I want to bypass malfunctioning ECU so that seats and mirrors work manually with switches, but not with memory function.

1993 RR LWB

Thanks!

[Paul Grant]

For what it's worth, you might want to replace the battery in the ECU. That may solve your problem. I've seen the battery on sale on line for about $6.

[ragomes]

Anyone have one?

Anyone have wiring schematic for memory seat ECU? Specifically, I want to bypass malfunctioning ECU so that seats and mirrors work manually with switches, but not with memory function.

1993 RR LWB

Thanks!

[ams1069]

I have the electrical manual for a 95. PM me with your email address if you would like me to send it to you. I think you can access the electrical troubleshooting manual for a 93 through rave. Good Luck!!

[mduark]

I've tried to replace the battery in the ECU without luck. The acid leaked from the battery and corroded the board. If you have any luck with this please let me know! Or if someone out there has a known functioning ECU I'd be more than happy to buy it.

Thanks,

Mark Douglas
93 RRC 195K
93 RRC 55k
82 Series 3 200 TDI
70 Series 2a

[Wallace]

I have had luck replacing batteries but more often the circuit board is damaged beyond my ability to repair. I bought a handful of relays and re-wired the drivers seat operation in my 95 RRC using the relays and eliminating the memory feature. The relays fit under the seat where the ECU had been. I only wired the seat motors and didn't bother with the remote mirror feature. It's been several years since I made the modification and the relays have worked fine and have been more reliable than the direct wired switches in my 89 RRC.

I just traced out the wires and inserted the relays in place of the circuit board using the existing harness that I cut off the beige ECU box under the seat.

I didn't develop a diagram. However, the LRO forum has a thread that does include a simple wiring diagram. http://www.lro.com/forum3/viewtopic.php?f=33&t=4955

Since I didn't follow this LRO version, I can't vouch for it. However, it seems simple enough and the color code appears to be accurate. In this diagram, the left column shows the existing seat switches, the center column shows the relays and the right column shows the seat motors.