Ive been trying to figure this issue out and have run through all the diags on the suspension control unit. This is what I know

I had my infiniti into the dealer and had new air bags installed. Dealer said the compressor was not working so I installed a new compressor, height sensor and replaced the relays.

Testing reveals the following.


Testing relay 130 I have batter power and ground.
Testing relay 131 I don't get any battery power out of pin 5. I've checked the fuses and their fine.
Checking the connector at he compressor I have ground but no power. I know pin 3 at 131 and pin 4 on the compressor connector are a circuit but I'd like to know where pin 5 goes to and troubleshoot from there.

I can bypass the connector and power the compressor directly but would prefer the SCU do it.

From the wiring diagrams I cannot tell if the loss of battery power to pin 5 is caused by the SCU. The diags say to replace a fuse or fix the connector. I've checked the fuses and their fine and can't see any other issue. I've not done a continuity test between the relay connector and the SCU yet but it's next on my list.

Is there anything else I should check before I get into the interior? Is there a more detailed wiring diagram that shows the SCU in relation to relay E131? I'm guessing the SCU is at fault but I want to be sure before I purchase another one and go through the hassle of removing and replacing it.

Thanks in advance.

Problem solved. 30 amp fusible link was blown. After replacing everything else once the fuse was changed the compressor kicks on. Hopefully I won't have to take it into the shop to re initialize the SCU but let's see what happens and I'll go from there.