LED
Symptom: LED does not light
Fault symptom
LED does not light
Diagnostic procedure
1 Check the operation of the LED
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Connect the ISAT scan tool.
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The LED should light up.
Is the LED on?
The fault is of intermittent nature, proceed to point 6.
Continue with point 2.
2 Check the operation of the LED (contd.)
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Connect the test lamp to the 2-pin LED connector.
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Repeat the ISAT scan tool command as in point 1.
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The test lamp should light.
Is the test lamp on?
Change the LED.
Continue with point 3.
3 Check the LED's power supply
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Unplug connector H33-1.
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Connect the test lamp to pin 29 of connector H33-1 and a good grounding point.
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Repeat the ISAT scan tool command as in point 1.
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The test lamp should light.
Is the test lamp on?
Continue with point 4.
Continue with point 5.
4 Check the LED wiring
Conduct a continuity test on the cable assembly between
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connector H33-1, pin 29, and the 2-pin LED connector, pin 2.
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the 2-pin LED connector, pin 1, and grounding point G34S.
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The resistance should be < 1 ohm.
Is the resistance correct?
Continue with point 6.
Repair or replace the wiring harness.
5 Check the wiring connected to the electronic control module
Conduct a continuity test on the cable assembly between connector H33-1, pin 29 and the control module, pin 2.
The resistance should be < 1 ohm.
Is the resistance correct?
Continue with point 6.
Repair or replace the wiring harness.
6 Final check
Check to see if the fault symptom remains.
Is the problem still present?
See "Before replacing a control module".
The remedial measures taken were correct or the fault is of intermittent nature.
