Procedure for replacing the control module
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Procedure for replacing the control module
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When all tests have been conducted as described in the action program for the particular diagnostic trouble code and no fault has been found, it is natural to assume that the control module is faulty.
Considering that the control module is both a very high quality and a very expensive component, it is important to be as sure as possible of the diagnosis.
Run through the following points very carefully before definitely deciding that the control module is the cause of the fault.
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1.
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Check once more that the points in the fault diagnosis schedule for the current code have been carried out. If the fault diagnosis has not been carried out as described in the methods for intermittent faults, repeat the fault diagnosis and try to provoke the intermittent fault.
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2.
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Study the wiring diagram for the circuit in question and make sure that you understand it. If necessary, refer to the appropriate parts in the technical description and the electrical function description in Service Manual "3:2 Wiring Diagrams".
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1.
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Check all grounding points. If you have done this before, do it again.
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2.
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Check the voltage feed and fuses to the control module.
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3.
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Check to make sure there are no pins loose in the control module connector.
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4.
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If the original fault still persists, the control module will have to be changed.
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Important
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If the original fault is intermittent, the fault is nearly always located in the wiring harness. In the case of intermittent faults the wiring harness should be replaced before the SRS control module is replaced.
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