Transmission Internal Mode Switch Logic
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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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