Data Link Connector

Fault symptom
No Intelligent Saab Tester (ISAT) scan tool communication.





Diagnostic procedure
1 Check the ISAT scan tool connector
Connect the ISAT scan tool,
The ISAT scan tool display should light up.
Does the display light up?
[YES] Continue with point 5.
[NO] Continue with point 2.

2 Check fuse 13.






3 Check the power supply (+30 circuit) in the data link connector
Connect the test lamp to pin 16 of the data link connector and a good grounding point.
The test lamp should light up if a +30 power supply is present.
Does the lamp light up?
[YES] Continue with point 4.
[NO] Check and if necessary rectify the wiring between pin 16 and fuse 13. If the wiring is OK, continue fault diagnosis as described in +30 power supply".


4 Check the data link connector's ground connection
- Connect the test lamp to pins 5 and 16 of the data link connector.
- Connect the test lamp to pins 4 and 16 of the data link connector.
In both tests the lamp should light up if connection to ground is OK.
Does the lamp light up?
[YES] Check the ISAT scan tool.
[NO] Replace or repair the wiring between pin 5 and grounding point G33S, or between pin 4 and grounding point G33P (LHD) or G34P (RHD).







5 Check ISAT scan tool contact with anti-theft alarm
- Important. The anti-theft alarm must not be armed.
- Select "THEFT ALARM".
The ISAT scan tool should show the menu for the anti-theft alarm.
Does it show the menu?
[YES] The fault is of intermittent nature, proceed to point 8.
[NO] Continue with point 6.


6 Check ISAT scan tool contact with other system
Select another system the car is equipped with (e.g. ICE).
The ISAT scan tool should display the menu for the system selected.
Does it show the menu?
[YES] Continue with point 7.
[NO] Check the ISAT scan tool.






7 Check the wiring
Check the wiring harness for continuity between pin 8 of the data link connector and pin 19 of the anti-theft alarm's electronic control module.
The resistance should be < 1 ohm.
Is the resistance OK?
[YES] Continue with point 8.
[NO] Repair or replace the wiring harness.

8 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".
[NO] The remedial measures taken were correct or the fault is of intermittent nature.