</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by YourMom:
<strong>I just noticed something...if I bypass the diff lock detection switch and hook a wire straight to ground, I get a solid green light. (EXACTLY what you would expect.) Now you engage the diff lock dash switch and you get the blinking green. That makes no sense--if the detection switch is grounded, it shouldn't matter what position the dash switch is in. Perhaps I should use some other input to power the LED besides the "RLP" input on the ECU... <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Ok, here is what I think the locker ECU is doing. It sends out a 1 sec pulse to drive the electric motor. It will continue to send out this pulse until the RLP switch detects the diff being locked. This is why you see the light on the dash blinking. It is trying to send out the pulse to drive the electric motor until it locks. It only sends out a pulse to prevent the electric motor from jamming.

Grounding the RLP tricks the locker ECU to think that the locker is locked, so it stops sending pulses to the electric motor.

Ok, I reread your post and you said that the light blinks, even if the RLP is ground and the switch is activated.
It could use the other grounds in the wiring to detect that the locker is locked, but uses both grounds to confirm
that the locker is locked. If the ECU is waiting on both wires to be grounded, then it won't stop locking the locker.

<small>[ 09 April 2002, 09:25 AM: Message edited by: Karl ]</small>