B1193

Diagnostic Trouble Code B1193
Horn, open circuit

Fault Symptom
The horn does not work.
The LED flashes during the delay period.

Condition
Open circuit generates a diagnostic trouble code







Diagnostic procedure
1 Check fuse 16
2 Check operation of the horn.
- Connect an Intelligent Saab Tester (ISAT) scan tool.
- Select "ACTIVATE".
- Select "HORN".
- Select "ON".

The horn should sound.
Does the horn work properly?
[YES] Proceed to point 6.
[NO] Continue with point 3.







3 Check the horn's power supply
- Disconnect the horn.
- Connect the test lamp to the horn's 2-pin connector.
- Select "HORN" with the ISAT scan tool.

When "ON" is selected, the test lamp should light up.
Does it light up?
[YES] Change the horn.
[NO] Continue with point 4.

4 Check the horn's power supply (+30 circuit)
Connect the test lamp to pin 1 of the horn's 2-pin connector and a good grounding point.

The test lamp should light up.
Does it light up?
[YES] Continue with point 5.
[NO] Check circuit continuity and, if necessary, repair or replace the wiring between pin 1 of the connector and fuse 16.







5 Check the horn's ground connection
- Pin 11 of the electronic control module grounds the horn when it is activated.
- Check the continuity of the wiring between pin 2 of the connector and pin 11 of the electronic control module.

The resistance should be < 1 ohm.
Is the resistance reading correct?
[YES] Proceed to point 6.
[NO] Repair or replace the wiring harness.

6 Check diagnostic trouble code generation
- Clear the diagnostic trouble code.
- Drive the car at varying engine speeds and loads.
- Check whether the diagnostic trouble code is generated afresh.

Is the DTC generated afresh?
[YES] Continue as described in "Before Changing the Electronic Control Module". Before Changing the Electronic Control Module
[NO] The remedial measure taken was correct or the fault is of intermittent nature.