Yes, that's the one for this problem.
Silver can, rectangular with rounded corners.
On rail attached to inner fender, rearward from power steering reservoir.

This is the high-low switching relay. It has several moving parts, and is relatively complex as relays go. I've seen one function fail on these with other functions still working. It definitely could get a burned contact or connector in the high-beam output area.

Heavy yellow wire at hi-lo relay provides headlight voltage into the relay, which is routed out to either high or low beams at your pleasure. The other (main) headlight relay activates this yellow wire, so if your high beams work OK then the main headlight relay is OK.

Red wire out of relay at terminal #56a powers the high beams. Red + white wire powers the dash indicator bulb. Blue wire carries low-beams power to the bulb failure sensor, from there it is sent onward to the two low beam filaments.

Red wire at #15 is battery power in; this powers the relay's coil and also provides power to the high beams ONLY while the stalk is pulled back. Other side of relay's coil has brown wire which goes to stalk switch, from there it is grounded when stalk is pulled. So the coil's circuit has 12V present always but the circuit is completed - grounded - only when you pull the stalk.

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Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.