Where are the relays for a 1990 Jaguar XJ6 blower motor.

They are fused through the each bulb fail module/bulb check modules ; RF,LF,RR,LR.

if only one headlight comes on its not yhe relay.have a friend cut the headlights on while you listen under the dash and under the hood for a relay to click ..that will be a sure fire way to determine that.