Check terminal 3 of the DRL Relay. It should have power all the time (along with terminal 1). If not, check the fuse and wiring between fuse and relay. Terminal 5 of the DRL Relay should have power whenever the DRLs are (supposed to be) on. Use chassis or other ground when taking readings.
Terminal 2 of the DRL Relay will show battery voltage when the relay is de-energized and close to ground when the relay is on. If it is always at battery voltage, check the wire going to terminal 105 of the IPDM (the IPDM sinks that wire to ground to energize the relay).
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