Join Date: Sep 2016
Location: Raleigh, North Carolina
I'll attach some selected pages from the service manual that references some things to check. On the mult-function relay unit in the engine bay (just inboard and below the ECU), with the key in the run position, you should have 0 volts DC on terminals 4 & 6. When the key is in the run position and the start button is pushed you should have battery voltage (12-14 volts DC) at those same terminals 4 & 6.
If you don't have battery voltage at terminal 6 when the key is in the run position and the button is pushed, there is something wrong with either the immobilizer, starter switch or wiring.
If you don't have battery voltage at terminal 4 but you do have it at terminal 6 when the key is in the run position and the button is pushed, then you have a problem with the multi-function relay unit.
If you have battery voltage at both terminals 4 and 6 when the button is pushed, then you need to check the connection at the starter. At the starter, there will be a couple of wires, a large battery cable that should have power all the time; there will also be a smaller 2mm black wire, when the key is in the run position and the starter button is pushed, there should be battery voltage at the 2mm black wire.
It shouldn't be too hard to reach the multi-function relay unit from below the car if the engine access panel is removed, if you have a clam hinge you should be able to reach it from the top but it's pretty tight. The starter isn't very accessible, hence my suggestion to probe the relay unit first.
Good luck, let us know what you find.
Oh boy, with RMC2 unplugged, trying to start the car, We have 3.7V on 4 and 0V on 6 while attempting to crank. We do not have battery voltage at either 4 or 6 when the vehicle is acting up. 4 reacts directly to the pressing of the start button, but we are losing voltage somewhere in line? We have 0V on the starter signal wire when acting up, with 12.4V battery voltage present. Are we not getting full voltage since we have rmc2 unplugged which powers up the ECU?
Also was the 4 on the rmc2 was the wire to the ecu or did you mean 5 on rmc1?
Last edited by waddy; 07-16-2019 at 02:10 PM.