Transmission Internal Mode Switch Logic
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Internal Mode Switch (IMS)
| IMS Circuits/Parameter | Selector Position | ||||
|---|---|---|---|---|---|
| Park | Reverse | Neutral | Drive | Manual | |
| Direction Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| Direction IMS D1 | HIGH | HIGH | LOW | LOW | LOW |
| Direction IMS D2 | LOW | LOW | HIGH | HIGH | HIGH |
| Direction IMS R1 | HIGH | LOW | LOW | HIGH | HIGH |
| Direction IMS R2 | LOW | HIGH | HIGH | LOW | LOW |
| Direction IMS Start | LOW | HIGH | LOW | HIGH | HIGH |
| Range Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| IMS A | LOW | LOW | HI | HI | HI |
| IMS B | HI | LOW | LOW | LOW | HI |
| IMS C | HI | HI | HI | LOW | LOW |
| IMS P | LOW | HI | LOW | HI | LOW |
| Always HIGH status: Open/short to voltage condition Always LOW status: Short to ground condition Every status HIGH for either switch indicates an open ground circuit or connector for that portion of the IMS. |
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