Fault Diagnosis, LED

Fault symptom
The LED does not light up







Diagnostic procedure
1 Check the operation of the LED
- Connect an Intelligent Saab Tester (ISAT) scan tool.
- Select "ACTIVATE".
- Select "LED"
- Select "ON".

The LED should light up.
Does the LED light up?
[YES] The fault is of intermittent nature, proceed to point 5.
[NO] Continue with point 2.







2 Check the LED's power supply
- Unplug the LED.
- Connect the test lamp to the LED's 2-pin connector.
- Activate 'LED" with the ISAT scan tool.

The test lamp should light up.
Does it light up?
[YES] Change the LED.
[NO] Continue with point 3.

3 Check the LED's power supply
- Connect the test lamp to pin 2 of the LED's 2-pin connector and a good grounding point.
- Activate "LED" with the ISAT scan tool.

The test lamp should light up.
Does it light up?
[YES] Repair or replace the ground cable between pin 1 of the LED's 2-pin connector and grounding point G8.
[NO] Continue with point 4.







4 Check the wiring
Check the continuity of the wiring between pin 2 of the LED's connector and pin 2 of the control module.

The resistance should be < 1 ohm.
Is the resistance OK?
[YES] Continue with point 5.
[NO] Repair or replace the wiring harness.

5 Final test
Check to see if the fault symptom persists.

Does the trouble persist?
[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.