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Electronic Automatic Temperature Control (EATC) Module Cold Boot Process

The purpose of the cold boot process is to allow the EATC module to reinitialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the EATC module electrical connectors.
  3. Wait one minute.
  4. Connect the EATC module electrical connectors.
  5. Turn the ignition switch to the ON position.
  6. Select any position except OFF on the EATC module.

The EATC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 minutes.

NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the Introduction - Gasoline Engines article.
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Action to Take
B1249 Blend Door Short or Failure Go to Pinpoint Test A .
B1251 In-Vehicle Temperature Sensor Open Circuit Go to Pinpoint Test B .
B1253 In-Vehicle Temperature Sensor Short to Ground Go to Pinpoint Test B .
B1255 Ambient Temperature Sensor Open Circuit Go to Pinpoint Test C .
B1257 Ambient Temperature Sensor Short to Ground Go to Pinpoint Test C .
B1259 A/C Solar Radiation Sensor Circuit Open Go to Pinpoint Test D .
B1261 Solar Radiation Sensor Circuit Short to Ground Go to Pinpoint Test D .
U1073 SCP Invalid or Missing Data for Engine Coolant If DTCs are present in the instrument cluster, diagnose those codes first. CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
If no DTCs are present in the instrument cluster, CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
U1341 SCP Invalid or Missing Data for Function Read Vehicle Speed REFER to the Introduction - Gasoline Engines article.
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