| The Ignition Discharge Module (IDM), also known as the Direct Ignition
Cassette or DIC, is a common failure on both NG900 and early 9-3 models.
Typical life is 30-100k miles. Common faults include leaks from oil
filled coils, a cracked relay housing, or burned out electrical components.
Some 9-3 and 9-5 ignition modules have been recalled doe to a design defect
and replaced free of charge by Saab.
The module cannot be repaired, only replaced. Installing a new
one takes only about 15 minutes. Saab recommends that anytime the
ignition module is being replaced with a new one, new spark plugs should
also be installed, and the ecu reset by disconnecting the battery, and
allowed to re-adapt to the new parts. |
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Screws
The ignition module is held down by four T-30 screws. If the
screws are found to be loose, they may have to be reassembled with lock
washers or blue Loctite. |
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Connector
The connector has a locking latch (red) which slides to the side, then
the connector can be unplugged fairly easily. |
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Removal
Once the screws are out and the module is disconnected, it can be pulled
straight up and removed. If possible, it should be set aside carefully,
with the rubber boots which fit over the spark plugs pointing down.
The module can be inspected but not tested or repaired. |
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Visible Parts
Upper section with four coils, and a few other visible components.
Lower section with rubber boots which go over the spark plugs, and spring
contacts inside which have the same function as spark plug wires. |
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Label
The revision and date of manufacture are printed on the IDM label.
I this case, 1999 week 20, revision TK3.2E. The date code indicates
the rough age of the cassette, which allows the mileage to be estimated.
Most ignition cassettes do not last over 100k miles. |
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Spark Plug Boots
Before reassembly, the plugs and/or the end of the rubber boots should
be coated with a thin layer of dielectric grease. |
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Installation
Seat the module over the plugs carefully, then press down to fit the
boots on the plugs. Tighten the screws to about 8 lb-ft, and replace
the connector. Check the screws a few days later to make sure they
are still tight. If loose, reassemble with blue Loctite or lock washers. |
Part Numbers
Original: #9178955
Replacement: #55561132
(for 1994-'98 T5 ignitions)
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Tools
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Screwdriver
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T-30 bit or driver
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Dielectric grease
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Loctite, blue, only if needed
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