Turn signal doesn't have a relay. If your talking about the flasher, it is built into the hazard switch. Which yours may or may not be in the turn signal switch. If the hazard is on the column, then it is in the switch. In the dash, it's not. I haven't worked on the express, but that's where GM puts them.
SOURCE: need location of turn signal relay on a 1991 chev berretta
most times it is located under dash but some mounted to fire wall under hood
Turn on the Durango and check each of the four turn signals
to make sure that the bulbs are not burned out. If you find one that has gone
out, replace the bulb and retest the turn signals. When a bulb goes bad on this
circuit, the resulting operation can mimic a bad flasher or one that is
failing.
Locate the combination turn signal flasher and relay. It is
on the left end of the driver's dash. Open the access door and view the
collection of relays and fuses. At the left side of the mounting block is a
larger flasher and relay. This is the combination turn signal flasher and
relay.
Test
the relay by placing you finger on the relay housing and activating the turn
signal. If you have found the right one, you should feel a clicking as the turn
signal blinks. Remove the relay, replace with the new relay and close the
access door
.
Start the Durango and activate the turn signals to check that they each work. The light should turn on and should blink. Also, check the hazard lights to make sure they work.
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