9-5 Aero (9600) L4-2.3L Turbo (B235) HO (2000)
^
The test lamp should light.
Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness.
Observe the multimeter, test lamp or diagnostic tool while doing this.
Is the function correct?
NO
^
See: Horn Failure / Steering Wheel Controls Partly Inoperative/Rectifying the Lead - II
YES ^
See: Horn Failure / Steering Wheel Controls Partly Inoperative/Changing Components - I
Changing Components - I
Changing Components
^
Change - Horn relay
After performing this procedure See: Horn Failure / Steering Wheel Controls Partly Inoperative/Final Check - I
Changing Components - II
Changing Components