9-3 Hatchback (9400) L4-2.0L Turbo (B205) (2000)
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Connect test lamp 86 11 857 between B+ and pin 1 of the male connector.
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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
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See: Horn Failure/Steering Wheel Switch Unit Failure/NO/Horn Switch/Rectifying the Lead - I
YES -
See: Horn Failure/Steering Wheel Switch Unit Failure/NO/Horn Switch/Checking the Control Module's Sensor Input
Checking the Control Module's Sensor Input