Chig213

Hello all, having an issue with my esof 4x4. I get the indicator lights at start up, but when switching to 4hi or 4lo, no relay clicking in dash / no response. I've checked all fuses with a multimeter and power to fuses, ohm'd the switch and the solenoids which all check good. However with the switch set to 4hi I'm not getting the ground signal to the passenger side 4x4 vac solenoid. I'm suspecting the gem module is bad or not sending the ground signal. I've looked for other relays with no luck. Nothing by the master cylinder and I also removed the radio and glovebox. All I see is duct work. Any help on exact relay location or ideas would be greatly appreciated.