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From The Saab Tech Wiki
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. When used with the proper NGK spark plugs the typical life is 30-100k miles. Common faults include leaks from oil filled coils, a cracked relay housing, burned out electrical components, and using incorrect spark plugs. Some 9-3 and 9-5 ignition modules have been recalled due to a design defect and replaced free of charge by Saab.
[[File:IDM_Side.jpg|thumb|none|Side view of DIC]]
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.
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.
[[File:IDM_Screws.jpg|thumb|none|DIC Screw and connector locations]]
=== Connector ===
The connector has a locking latch (red) which slides to the side, then the connector can be unplugged fairly easily.
[[File:IDM_connector.jpg|thumb|none|DIC Connector]]
=== Removal ===
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.
[[File:IDM_coils.jpg|thumb|none|Visible parts of the DIC]]
=== Label ===
The revision and date of manufacture are printed on the IDM label. The date code is a four digit number where the first two digits are the year and the second two digits are the week of the year. For example, "0237" was manufactured in the 37th week of 2002. There is also a revision code. For the T5 (red) DIC, the current revision is TK3.2C which is more reliable than the older TK3.2 without a letter. The date code allows the mileage to be estimated. Most ignition cassettes do not last over 100k miles.
[[File:IDM_label.jpg|thumb|none|DIC Label - Revision and Date Code]]
=== 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.
[[File:IDM_boot.jpg|thumb|none|DIC Boots]]
=== 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.
[[File:IDM_inst.jpg|thumb|none|DIC installation]]
